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cppcheck/test/testbufferoverrun.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2018 Cppcheck team.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "checkbufferoverrun.h"
#include "library.h"
#include "settings.h"
#include "testsuite.h"
#include "token.h"
#include "tokenize.h"
#include <tinyxml2.h>
#include <climits>
#include <list>
#include <ostream>
#include <string>
class TestBufferOverrun : public TestFixture {
public:
TestBufferOverrun() : TestFixture("TestBufferOverrun") {
}
private:
Settings settings0;
void check(const char code[], bool experimental = true, const char filename[] = "test.cpp") {
// Clear the error buffer..
errout.str("");
settings0.inconclusive = true;
settings0.experimental = experimental;
// Tokenize..
Tokenizer tokenizer(&settings0, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, filename);
// Check for buffer overruns..
CheckBufferOverrun checkBufferOverrun;
checkBufferOverrun.runChecks(&tokenizer, &settings0, this);
tokenizer.simplifyTokenList2();
checkBufferOverrun.runSimplifiedChecks(&tokenizer, &settings0, this);
}
void check(const char code[], const Settings &settings, const char filename[] = "test.cpp") {
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, filename);
// Clear the error buffer..
errout.str("");
// Check for buffer overruns..
CheckBufferOverrun checkBufferOverrun(&tokenizer, &settings, this);
checkBufferOverrun.runChecks(&tokenizer, &settings, this);
tokenizer.simplifyTokenList2();
checkBufferOverrun.runSimplifiedChecks(&tokenizer, &settings, this);
}
void run() {
settings0.addEnabled("warning");
settings0.addEnabled("style");
settings0.addEnabled("portability");
TEST_CASE(noerr1);
TEST_CASE(noerr2);
TEST_CASE(noerr3);
TEST_CASE(noerr4);
TEST_CASE(sizeof3);
TEST_CASE(array_index_1);
TEST_CASE(array_index_2);
TEST_CASE(array_index_3);
TEST_CASE(array_index_6);
TEST_CASE(array_index_7);
TEST_CASE(array_index_9);
TEST_CASE(array_index_11);
TEST_CASE(array_index_12);
TEST_CASE(array_index_13);
TEST_CASE(array_index_14);
TEST_CASE(array_index_15);
TEST_CASE(array_index_16);
TEST_CASE(array_index_17);
TEST_CASE(array_index_18);
TEST_CASE(array_index_19);
TEST_CASE(array_index_20);
TEST_CASE(array_index_21);
TEST_CASE(array_index_22);
TEST_CASE(array_index_23);
TEST_CASE(array_index_24); // ticket #1492 and #1539
TEST_CASE(array_index_25); // ticket #1536
TEST_CASE(array_index_26);
TEST_CASE(array_index_27);
TEST_CASE(array_index_28); // ticket #1418
TEST_CASE(array_index_29); // ticket #1734
TEST_CASE(array_index_30); // ticket #2086 - out of bounds when type is unknown
TEST_CASE(array_index_31); // ticket #2120 - out of bounds in subfunction when type is unknown
TEST_CASE(array_index_32);
TEST_CASE(array_index_33); // ticket #3044
TEST_CASE(array_index_34); // ticket #3063
TEST_CASE(array_index_35); // ticket #2889
TEST_CASE(array_index_36); // ticket #2960
TEST_CASE(array_index_37);
TEST_CASE(array_index_38); // ticket #3273
TEST_CASE(array_index_39);
TEST_CASE(array_index_40); // loop variable calculation, taking address
TEST_CASE(array_index_41); // structs with the same name
TEST_CASE(array_index_42);
TEST_CASE(array_index_43); // struct with array
TEST_CASE(array_index_44); // #3979
TEST_CASE(array_index_45); // #4207 - calling function with variable number of parameters (...)
TEST_CASE(array_index_46); // #4840 - two-statement for loop
TEST_CASE(array_index_47); // #5849
TEST_CASE(array_index_multidim);
TEST_CASE(array_index_switch_in_for);
TEST_CASE(array_index_for_in_for); // FP: #2634
TEST_CASE(array_index_calculation);
TEST_CASE(array_index_negative1);
TEST_CASE(array_index_negative2); // ticket #3063
TEST_CASE(array_index_for_decr);
TEST_CASE(array_index_varnames); // FP: struct member. #1576
TEST_CASE(array_index_for_continue); // for,continue
TEST_CASE(array_index_for); // FN: for,if
TEST_CASE(array_index_for_neq); // #2211: Using != in condition
TEST_CASE(array_index_for_question); // #2561: for, ?:
TEST_CASE(array_index_for_andand_oror); // FN: using && or || in the for loop condition
TEST_CASE(array_index_for_varid0); // #4228: No varid for counter variable
TEST_CASE(array_index_vla_for); // #3221: access VLA inside for
TEST_CASE(array_index_extern); // FP when using 'extern'. #1684
TEST_CASE(array_index_cast); // FP after cast. #2841
TEST_CASE(array_index_string_literal);
TEST_CASE(array_index_same_struct_and_var_name); // #4751 - not handled well when struct name and var name is same
TEST_CASE(array_index_valueflow);
TEST_CASE(array_index_valueflow_pointer);
TEST_CASE(array_index_function_parameter);
TEST_CASE(array_index_enum_array); // #8439
TEST_CASE(buffer_overrun_2_struct);
TEST_CASE(buffer_overrun_3);
TEST_CASE(buffer_overrun_4);
TEST_CASE(buffer_overrun_5);
TEST_CASE(buffer_overrun_6);
TEST_CASE(buffer_overrun_7);
TEST_CASE(buffer_overrun_8);
TEST_CASE(buffer_overrun_9);
TEST_CASE(buffer_overrun_10);
TEST_CASE(buffer_overrun_11);
TEST_CASE(buffer_overrun_15); // ticket #1787
TEST_CASE(buffer_overrun_16);
TEST_CASE(buffer_overrun_18); // ticket #2576 - for, calculation with loop variable
TEST_CASE(buffer_overrun_19); // #2597 - class member with unknown type
TEST_CASE(buffer_overrun_21);
TEST_CASE(buffer_overrun_24); // index variable is changed in for-loop
TEST_CASE(buffer_overrun_26); // #4432 (segmentation fault)
TEST_CASE(buffer_overrun_27); // #4444 (segmentation fault)
TEST_CASE(buffer_overrun_28); // Out of bound char array access
TEST_CASE(buffer_overrun_29); // #7083: false positive: typedef and initialization with strings
TEST_CASE(buffer_overrun_30); // #6367
TEST_CASE(buffer_overrun_bailoutIfSwitch); // ticket #2378 : bailoutIfSwitch
TEST_CASE(buffer_overrun_function_array_argument);
TEST_CASE(possible_buffer_overrun_1); // #3035
TEST_CASE(buffer_overrun_readSizeFromCfg);
TEST_CASE(valueflow_string); // using ValueFlow string values in checking
// It is undefined behaviour to point out of bounds of an array
// the address beyond the last element is in bounds
// char a[10];
// char *p1 = a + 10; // OK
// char *p2 = a + 11 // UB
TEST_CASE(pointer_out_of_bounds_1);
TEST_CASE(pointer_out_of_bounds_2);
TEST_CASE(pointer_out_of_bounds_3);
TEST_CASE(pointer_out_of_bounds_sub);
TEST_CASE(strncat1);
TEST_CASE(strncat2);
TEST_CASE(strncat3);
TEST_CASE(strcat1);
TEST_CASE(strcat2);
TEST_CASE(strcat3);
TEST_CASE(varid1);
TEST_CASE(varid2); // ticket #4764
TEST_CASE(assign1);
TEST_CASE(alloc_new); // Buffer allocated with new
TEST_CASE(alloc_malloc); // Buffer allocated with malloc
TEST_CASE(alloc_string); // statically allocated buffer
TEST_CASE(alloc_alloca); // Buffer allocated with alloca
TEST_CASE(countSprintfLength);
TEST_CASE(minsize_argvalue);
TEST_CASE(minsize_sizeof);
TEST_CASE(minsize_strlen);
TEST_CASE(minsize_mul);
TEST_CASE(unknownType);
TEST_CASE(terminateStrncpy1);
TEST_CASE(terminateStrncpy2);
TEST_CASE(terminateStrncpy3);
TEST_CASE(recursive_long_time);
TEST_CASE(crash1); // Ticket #1587 - crash
TEST_CASE(crash2); // Ticket #3034 - crash
TEST_CASE(crash3); // Ticket #5426 - crash
TEST_CASE(executionPaths1);
TEST_CASE(executionPaths2);
TEST_CASE(executionPaths3); // no FP for function parameter
TEST_CASE(executionPaths5); // Ticket #2920 - False positive when size is unknown
TEST_CASE(executionPaths6); // unknown types
TEST_CASE(cmdLineArgs1);
TEST_CASE(checkBufferAllocatedWithStrlen);
TEST_CASE(scope); // handling different scopes
TEST_CASE(getErrorMessages);
// Access array and then check if the used index is within bounds
TEST_CASE(arrayIndexThenCheck);
TEST_CASE(bufferNotZeroTerminated);
TEST_CASE(negativeMemoryAllocationSizeError) // #389
TEST_CASE(negativeArraySize);
}
void noerr1() {
check("extern int ab;\n"
"void f()\n"
"{\n"
" if (ab)\n"
" {\n"
" char str[50];\n"
" }\n"
" if (ab)\n"
" {\n"
" char str[50];\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void noerr2() {
check("static char buf[2];\n"
"void f1(char *str)\n"
"{\n"
" strcpy(buf,str);\n"
"}\n"
"void f2(char *str)\n"
"{\n"
" strcat(buf,str);\n"
"}\n"
"void f3(char *str)\n"
"{\n"
" sprintf(buf,\"%s\",str);\n"
"}\n"
"void f4(const char str[])\n"
"{\n"
" strcpy(buf, str);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void noerr3() {
check("struct { char data[10]; } abc;\n"
"static char f()\n"
"{\n"
" char data[1];\n"
" return abc.data[1];\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void noerr4() {
// The memory isn't read or written and therefore there is no error.
check("static void f() {\n"
" char data[100];\n"
" const char *p = data + 100;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void sizeof3() {
check("struct group { int gr_gid; };\n"
"void f()\n"
"{\n"
" char group[32];\n"
" snprintf(group, 32, \"%u\", 0);\n"
" struct group *gr;\n"
" snprintf(group, 32, \"%u\", gr->gr_gid);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void array_index_1() {
check("void f()\n"
"{\n"
" char str[0x10];\n"
" str[15] = 0;\n"
" str[16] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'str[16]' accessed at index 16, which is out of bounds.\n", errout.str());
check("char f()\n"
"{\n"
" char str[16];\n"
" return str[16];\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'str[16]' accessed at index 16, which is out of bounds.\n", errout.str());
// test stack array
check("int f()\n"
"{\n"
" int x[ 3 ] = { 0, 1, 2 };\n"
" int y;\n"
" y = x[ 4 ];\n"
" return y;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'x[3]' accessed at index 4, which is out of bounds.\n", errout.str());
check("int f()\n"
"{\n"
" int x[ 3 ] = { 0, 1, 2 };\n"
" int y;\n"
" y = x[ 2 ];\n"
" return y;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void array_index_2() {
check("void a(int i)\n" // valueflow
"{\n"
" char *str = new char[0x10];\n"
" str[i] = 0;\n"
"}\n"
"void b() { a(16); }");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'str[16]' accessed at index 16, which is out of bounds.\n", errout.str());
}
void array_index_3() {
check("void f()\n"
"{\n"
" int val[50];\n"
" int i, sum=0;\n"
" for (i = 0; i < 100; i++)\n"
" sum += val[i];\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (error) Array 'val[50]' accessed at index 99, which is out of bounds.\n", errout.str());
check("void f()\n"
"{\n"
" int val[50];\n"
" int i, sum=0;\n"
" for (i = 1; i < 100; i++)\n"
" sum += val[i];\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (error) Array 'val[50]' accessed at index 99, which is out of bounds.\n", errout.str());
check("void f(int a)\n"
"{\n"
" int val[50];\n"
" int i, sum=0;\n"
" for (i = a; i < 100; i++)\n"
" sum += val[i];\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (error) Array 'val[50]' accessed at index 99, which is out of bounds.\n", errout.str());
check("typedef struct g g2[3];\n"
"void foo(char *a)\n"
"{\n"
" for (int i = 0; i < 4; i++)\n"
" {\n"
" a[i]=0;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int argc)\n"
"{\n"
" char a[2];\n"
" for (int i = 4; i < argc; i++){}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int a[10]) {\n"
" for (int i=0;i<50;++i) {\n"
" a[i] = 0;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Array 'a[10]' accessed at index 49, which is out of bounds.\n", errout.str());
}
void array_index_6() {
check("struct ABC\n"
"{\n"
" char str[10];\n"
"};\n"
"\n"
"static void f()\n"
"{\n"
" struct ABC abc;\n"
" abc.str[10] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:9]: (error) Array 'abc.str[10]' accessed at index 10, which is out of bounds.\n", errout.str());
check("struct ABC\n"
"{\n"
" char str[10];\n"
"};\n"
"\n"
"static char f()\n"
"{\n"
" struct ABC abc;\n"
" return abc.str[10];\n"
"}");
ASSERT_EQUALS("[test.cpp:9]: (error) Array 'abc.str[10]' accessed at index 10, which is out of bounds.\n", errout.str());
// This is not out of bounds because it is a variable length array
check("struct ABC\n"
"{\n"
" char str[1];\n"
"};\n"
"\n"
"static void f()\n"
"{\n"
" struct ABC* x = malloc(sizeof(struct ABC) + 10);\n"
" x->str[1] = 0;"
"}");
ASSERT_EQUALS("", errout.str());
// This is not out of bounds because it is not a variable length array
check("struct ABC\n"
"{\n"
" char str[1];\n"
" int x;\n"
"};\n"
"\n"
"static void f()\n"
"{\n"
" struct ABC* x = malloc(sizeof(struct ABC) + 10);\n"
" x->str[1] = 0;"
"}");
ASSERT_EQUALS("[test.cpp:10]: (error) Array 'x->str[1]' accessed at index 1, which is out of bounds.\n"
"[test.cpp:10]: (error) Array 'x.str[1]' accessed at index 1, which is out of bounds.\n", errout.str());
// This is not out of bounds because it is a variable length array
// and the index is within the memory allocated.
/** @todo this works by accident because we ignore any access to this array */
check("struct ABC\n"
"{\n"
" char str[1];\n"
"};\n"
"\n"
"static void f()\n"
"{\n"
" struct ABC* x = malloc(sizeof(struct ABC) + 10);\n"
" x->str[10] = 0;"
"}");
ASSERT_EQUALS("", errout.str());
// This is out of bounds because it is outside the memory allocated.
/** @todo this doesn't work because of a bug in sizeof(struct) */
check("struct ABC\n"
"{\n"
" char str[1];\n"
"};\n"
"\n"
"static void f()\n"
"{\n"
" struct ABC* x = malloc(sizeof(struct ABC) + 10);\n"
" x->str[11] = 0;"
"}");
TODO_ASSERT_EQUALS("[test.cpp:9]: (error) Array 'str[1]' accessed at index 11, which is out of bounds.\n", "", errout.str());
// This is out of bounds if 'sizeof(ABC)' is 1 (No padding)
check("struct ABC\n"
"{\n"
" char str[1];\n"
"};\n"
"\n"
"static void f()\n"
"{\n"
" struct ABC* x = malloc(sizeof(ABC) + 10);\n"
" x->str[11] = 0;"
"}");
TODO_ASSERT_EQUALS("error", "", errout.str());
// This is out of bounds because it is outside the memory allocated
/** @todo this doesn't work because of a bug in sizeof(struct) */
check("struct ABC\n"
"{\n"
" char str[1];\n"
"};\n"
"\n"
"static void f()\n"
"{\n"
" struct ABC* x = malloc(sizeof(struct ABC));\n"
" x->str[1] = 0;"
"}");
TODO_ASSERT_EQUALS("[test.cpp:9]: (error) Array 'str[1]' accessed at index 1, which is out of bounds.\n", "", errout.str());
// This is out of bounds because it is outside the memory allocated
// But only if 'sizeof(ABC)' is 1 (No padding)
check("struct ABC\n"
"{\n"
" char str[1];\n"
"};\n"
"\n"
"static void f()\n"
"{\n"
" struct ABC* x = malloc(sizeof(ABC));\n"
" x->str[1] = 0;"
"}");
TODO_ASSERT_EQUALS("error", "", errout.str());
// This is out of bounds because it is not a variable array
check("struct ABC\n"
"{\n"
" char str[1];\n"
"};\n"
"\n"
"static void f()\n"
"{\n"
" struct ABC x;\n"
" x.str[1] = 0;"
"}");
ASSERT_EQUALS("[test.cpp:9]: (error) Array 'x.str[1]' accessed at index 1, which is out of bounds.\n", errout.str());
check("struct foo\n"
"{\n"
" char str[10];\n"
"};\n"
"\n"
"void x()\n"
"{\n"
" foo f;\n"
" for ( unsigned int i = 0; i < 64; ++i )\n"
" f.str[i] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:10]: (error) Array 'f.str[10]' accessed at index 63, which is out of bounds.\n", errout.str());
check("struct AB { char a[NUM]; char b[NUM]; }\n"
"void f(struct AB *ab) {\n"
" ab->a[0] = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("union { char a[1]; int b; } ab;\n"
"void f() {\n"
" ab.a[2] = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void array_index_7() {
check("struct ABC\n"
"{\n"
" char str[10];\n"
"};\n"
"\n"
"static void f(struct ABC *abc)\n"
"{\n"
" abc->str[10] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:8]: (error) Array 'abc->str[10]' accessed at index 10, which is out of bounds.\n"
"[test.cpp:8]: (error) Array 'abc.str[10]' accessed at index 10, which is out of bounds.\n", errout.str());
}
void array_index_9() {
check("static void memclr( char *data )\n"
"{\n"
" data[10] = 0;\n"
"}\n"
"\n"
"static void f()\n"
"{\n"
" char str[5];\n"
" memclr( str );\n"
"}");
ASSERT_EQUALS("[test.cpp:9] -> [test.cpp:3]: (error) Array 'str[5]' accessed at index 10, which is out of bounds.\n", errout.str());
check("static void memclr( int i, char *data )\n"
"{\n"
" data[10] = 0;\n"
"}\n"
"\n"
"static void f()\n"
"{\n"
" char str[5];\n"
" memclr( 0, str );\n"
"}");
ASSERT_EQUALS("[test.cpp:9] -> [test.cpp:3]: (error) Array 'str[5]' accessed at index 10, which is out of bounds.\n", errout.str());
check("static void memclr( int i, char *data )\n"
"{\n"
" data[i] = 0;\n"
"}\n"
"\n"
"static void f()\n"
"{\n"
" char str[5];\n"
" memclr( 10, str );\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:9] -> [test.cpp:3]: (possible error) Array index out of bounds.\n",
"", errout.str());
// This is not an error
check("static void memclr( char *data, int size )\n"
"{\n"
" if( size > 10 )"
" data[10] = 0;\n"
"}\n"
"\n"
"static void f()\n"
"{\n"
" char str[5];\n"
" memclr( str, 5 );\n"
"}");
ASSERT_EQUALS("", errout.str());
// #2097
check("void foo(int *p)\n"
"{\n"
" --p;\n"
" p[2] = 0;\n"
"}\n"
"\n"
"void bar()\n"
"{\n"
" int p[3];\n"
" foo(p+1);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void array_index_11() {
check("class ABC\n"
"{\n"
"public:\n"
" ABC();\n"
" char *str[10];\n"
" struct ABC *next();"
"};\n"
"\n"
"static void f()\n"
"{\n"
" ABC *abc1;\n"
" for ( ABC *abc = abc1; abc; abc = abc->next() )\n"
" {\n"
" abc->str[10] = 0;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:13]: (error) Array 'abc->str[10]' accessed at index 10, which is out of bounds.\n"
"[test.cpp:13]: (error) Array 'abc.str[10]' accessed at index 10, which is out of bounds.\n", errout.str());
}
void array_index_12() {
check("class Fred\n"
"{\n"
"private:\n"
" char str[10];\n"
"public:\n"
" Fred();\n"
"};\n"
"Fred::Fred()\n"
"{\n"
" str[10] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:10]: (error) Array 'str[10]' accessed at index 10, which is out of bounds.\n", errout.str());
check("class Fred\n"
"{\n"
"private:\n"
" char str[10];\n"
"public:\n"
" char c();\n"
"};\n"
"char Fred::c()\n"
"{\n"
" return str[10];\n"
"}");
ASSERT_EQUALS("[test.cpp:10]: (error) Array 'str[10]' accessed at index 10, which is out of bounds.\n", errout.str());
}
void array_index_13() {
check("void f()\n"
"{\n"
" char buf[10];\n"
" for (int i = 0; i < 100; i++)\n"
" {\n"
" if (i < 10)\n"
" int x = buf[i];\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void array_index_14() {
check("void f()\n"
"{\n"
" int a[10];\n"
" for (int i = 0; i < 10; i++)\n"
" a[i+10] = i;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'a[10]' accessed at index 19, which is out of bounds.\n", errout.str());
}
void array_index_15() {
check("void f()\n"
"{\n"
" int a[10];\n"
" for (int i = 0; i < 10; i++)\n"
" a[10+i] = i;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'a[10]' accessed at index 19, which is out of bounds.\n", errout.str());
}
void array_index_16() {
check("void f()\n"
"{\n"
" int a[10];\n"
" for (int i = 0; i < 10; i++)\n"
" a[i+1] = i;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'a[10]' accessed at index 10, which is out of bounds.\n", errout.str());
}
void array_index_17() {
check("void f()\n"
"{\n"
" int a[10];\n"
" for (int i = 0; i < 10; i++)\n"
" a[i*2] = i;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'a[10]' accessed at index 18, which is out of bounds.\n", errout.str());
check("void f()\n"
"{\n"
" int a[12];\n"
" for (int i = 0; i < 12; i+=6)\n"
" a[i+5] = i;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" int a[12];\n"
" for (int i = 0; i < 12; i+=6)\n"
" a[i+6] = i;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'a[12]' accessed at index 12, which is out of bounds.\n", errout.str());
check("void f() {\n" // #4398
" int a[2];\n"
" for (int i = 0; i < 4; i+=2)\n"
" a[i] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[2]' accessed at index 2, which is out of bounds.\n", errout.str());
check("void f() {\n" // #4398
" int a[2];\n"
" for (int i = 0; i < 4; i+=2)\n"
" do_stuff(a+i);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void array_index_18() {
check("void f()\n"
"{\n"
" int a[5];\n"
" for (int i = 0; i < 6; i++)\n"
" {\n"
" a[i] = i;\n"
" i+=1;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" int a[5];\n"
" for (int i = 0; i < 6; i++)\n"
" {\n"
" a[i] = i;\n"
" i++;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" int a[5];\n"
" for (int i = 0; i < 6; i++)\n"
" {\n"
" a[i] = i;\n"
" ++i;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" int a[5];\n"
" for (int i = 0; i < 6; i++)\n"
" {\n"
" a[i] = i;\n"
" i=4;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" int a[6];\n"
" for (int i = 0; i < 7; i++)\n"
" {\n"
" a[i] = i;\n"
" i+=1;\n"
" }\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:6]: (error) Buffer overrun\n", "", errout.str());
}
void array_index_19() {
// "One Past the End" is legal, as long as pointer is not dereferenced.
check("void f()\n"
"{\n"
" char a[2];\n"
" char *end = &(a[2]);\n"
"}");
ASSERT_EQUALS("", errout.str());
// Getting more than one past the end is not legal
check("void f()\n"
"{\n"
" char a[2];\n"
" char *end = &(a[3]);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[2]' accessed at index 3, which is out of bounds.\n", errout.str());
}
void array_index_20() {
check("void f()\n"
"{\n"
" char a[8];\n"
" int b[10];\n"
" for ( int i = 0; i < 9; i++ )\n"
" b[i] = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void array_index_21() {
check("class A {\n"
" int indices[2];\n"
" void foo(int indices[3]);\n"
"};\n"
"\n"
"void A::foo(int indices[3]) {\n"
" for(int j=0; j<3; ++j) {\n"
" int b = indices[j];\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void array_index_22() {
check("int main() {\n"
" size_t indices[2];\n"
" int b = indices[2];\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Array 'indices[2]' accessed at index 2, which is out of bounds.\n", errout.str());
}
void array_index_23() {
check("void foo()\n"
"{\n"
" char c[10];\n"
" c[1<<23]='a';\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'c[10]' accessed at index 8388608, which is out of bounds.\n", errout.str());
}
void array_index_24() {
// ticket #1492 and #1539
// CHAR_MAX can be equal to SCHAR_MAX or UCHAR_MAX depending on the environment.
// This test should work for both environments.
std::ostringstream charMaxPlusOne;
charMaxPlusOne << (CHAR_MAX+1);
check(("void f(char n) {\n"
" int a[n];\n" // n <= CHAR_MAX
" a[-1] = 0;\n" // negative index
" a[" + charMaxPlusOne.str() + "] = 0;\n" // 128/256 > CHAR_MAX
"}\n").c_str());
ASSERT_EQUALS("[test.cpp:3]: (error) Array index -1 is out of bounds.\n"
"[test.cpp:4]: (error) Array 'a["+charMaxPlusOne.str()+"]' accessed at index "+charMaxPlusOne.str()+", which is out of bounds.\n", errout.str());
check("void f(signed char n) {\n"
" int a[n];\n" // n <= SCHAR_MAX
" a[-1] = 0;\n" // negative index
" a[128] = 0;\n" // 128 > SCHAR_MAX
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Array index -1 is out of bounds.\n"
"[test.cpp:4]: (error) Array 'a[128]' accessed at index 128, which is out of bounds.\n", errout.str());
check("void f(unsigned char n) {\n"
" int a[n];\n" // n <= UCHAR_MAX
" a[-1] = 0;\n" // negative index
" a[256] = 0;\n" // 256 > UCHAR_MAX
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Array index -1 is out of bounds.\n"
"[test.cpp:4]: (error) Array 'a[256]' accessed at index 256, which is out of bounds.\n", errout.str());
check("void f(short n) {\n"
" int a[n];\n" // n <= SHRT_MAX
" a[-1] = 0;\n" // negative index
" a[32768] = 0;\n" // 32768 > SHRT_MAX
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Array index -1 is out of bounds.\n"
"[test.cpp:4]: (error) Array 'a[32768]' accessed at index 32768, which is out of bounds.\n", errout.str());
check("void f(unsigned short n) {\n"
" int a[n];\n" // n <= USHRT_MAX
" a[-1] = 0;\n" // negative index
" a[65536] = 0;\n" // 65536 > USHRT_MAX
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Array index -1 is out of bounds.\n"
"[test.cpp:4]: (error) Array 'a[65536]' accessed at index 65536, which is out of bounds.\n", errout.str());
check("void f(signed short n) {\n"
" int a[n];\n" // n <= SHRT_MAX
" a[-1] = 0;\n" // negative index
" a[32768] = 0;\n" // 32768 > SHRT_MAX
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Array index -1 is out of bounds.\n"
"[test.cpp:4]: (error) Array 'a[32768]' accessed at index 32768, which is out of bounds.\n", errout.str());
check("void f(int n) {\n"
" int a[n];\n" // n <= INT_MAX
" a[-1] = 0;\n" // negative index
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Array index -1 is out of bounds.\n", errout.str());
check("void f(unsigned int n) {\n"
" int a[n];\n" // n <= UINT_MAX
" a[-1] = 0;\n" // negative index
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Array index -1 is out of bounds.\n", errout.str());
check("void f(signed int n) {\n"
" int a[n];\n" // n <= INT_MAX
" a[-1] = 0;\n" // negative index
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Array index -1 is out of bounds.\n", errout.str());
}
void array_index_25() { // #1536
check("void foo()\n"
"{\n"
" long l[SOME_SIZE];\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void array_index_26() {
check("void f()\n"
"{\n"
" int a[3];\n"
" for (int i = 3; 0 <= i; i--)\n"
" a[i] = i;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'a[3]' accessed at index 3, which is out of bounds.\n", errout.str());
check("void f()\n"
"{\n"
" int a[4];\n"
" for (int i = 3; 0 <= i; i--)\n"
" a[i] = i;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void array_index_27() {
check("void f()\n"
"{\n"
" int a[10];\n"
" for (int i = 0; i < 10; i++)\n"
" a[i-1] = a[i];\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Array index -1 is out of bounds.\n", errout.str());
}
void array_index_28() {
// ticket #1418
check("void f()\n"
"{\n"
" int i[2];\n"
" int *ip = i + 1;\n"
" ip[-10] = 1;\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:5]: (error) Array ip[-10] out of bounds.\n", "", errout.str());
}
void array_index_29() {
// ticket #1724
check("void f()\n"
"{\n"
" int iBuf[10];"
" int *i = iBuf + 9;"
" int *ii = i + -5;"
" ii[10] = 0;"
"}");
TODO_ASSERT_EQUALS("[test.cpp:6]: (error) Array ii[10] out of bounds.\n", "", errout.str());
}
void array_index_30() {
// ticket #2086 - unknown type
check("void f() {\n"
" UINT8 x[2];\n"
" x[5] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Array 'x[2]' accessed at index 5, which is out of bounds.\n", errout.str());
}
void array_index_31() {
// ticket #2120 - sub function, unknown type
check("struct s1 {\n"
" unknown_type_t delay[3];\n"
"};\n"
"\n"
"void x(unknown_type_t *delay, const int *net) {\n"
" delay[0] = 0;\n"
"}\n"
"\n"
"void y() {\n"
" struct s1 obj;\n"
" x(obj.delay, 123);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct s1 {\n"
" unknown_type_t delay[3];\n"
"};\n"
"\n"
"void x(unknown_type_t *delay, const int *net) {\n"
" delay[4] = 0;\n"
"}\n"
"\n"
"void y() {\n"
" struct s1 obj;\n"
" x(obj.delay, 123);\n"
"}");
ASSERT_EQUALS("[test.cpp:11] -> [test.cpp:6]: (error) Array 'obj.delay[3]' accessed at index 4, which is out of bounds.\n", errout.str());
check("struct s1 {\n"
" float a[0];\n"
"};\n"
"\n"
"void f() {\n"
" struct s1 *obj;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void array_index_32() {
check("class X\n"
"{\n"
" public:\n"
" X()\n"
" {\n"
" m_x[0] = 0;\n"
" m_x[1] = 0;\n"
" }\n"
" int m_x[1];\n"
"};");
ASSERT_EQUALS("[test.cpp:7]: (error) Array 'm_x[1]' accessed at index 1, which is out of bounds.\n", errout.str());
}
void array_index_33() {
check("void foo(char bar[][4]) {\n"
" baz(bar[5]);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void array_index_34() { // ticket #3063
check("void foo() {\n"
" int y[2][2][2];\n"
" y[0][2][0] = 0;\n"
" y[0][0][2] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Array 'y[2][2][2]' index y[0][2][0] out of bounds.\n"
"[test.cpp:4]: (error) Array 'y[2][2][2]' index y[0][0][2] out of bounds.\n", errout.str());
check("struct TEST\n"
"{\n"
" char a[10];\n"
" char b[10][5];\n"
"};\n"
"void foo()\n"
"{\n"
" TEST test;\n"
" test.a[10] = 3;\n"
" test.b[10][2] = 4;\n"
" test.b[0][19] = 4;\n"
" TEST *ptest;\n"
" ptest = &test;\n"
" ptest->a[10] = 3;\n"
" ptest->b[10][2] = 4;\n"
" ptest->b[0][19] = 4;\n"
"}");
ASSERT_EQUALS("[test.cpp:9]: (error) Array 'test.a[10]' accessed at index 10, which is out of bounds.\n"
"[test.cpp:10]: (error) Array 'test.b[10][5]' index test.b[10][2] out of bounds.\n"
"[test.cpp:11]: (error) Array 'test.b[10][5]' index test.b[0][19] out of bounds.\n"
"[test.cpp:14]: (error) Array 'ptest->a[10]' accessed at index 10, which is out of bounds.\n"
"[test.cpp:15]: (error) Array 'ptest->b[10][5]' index ptest->b[10][2] out of bounds.\n"
"[test.cpp:16]: (error) Array 'ptest->b[10][5]' index ptest->b[0][19] out of bounds.\n"
"[test.cpp:14]: (error) Array 'ptest.a[10]' accessed at index 10, which is out of bounds.\n"
"[test.cpp:15]: (error) Array 'ptest.b[10][5]' index ptest.b[10][2] out of bounds.\n"
"[test.cpp:16]: (error) Array 'ptest.b[10][5]' index ptest.b[0][19] out of bounds.\n", errout.str());
check("struct TEST\n"
"{\n"
" char a[10][5];\n"
"};\n"
"void foo()\n"
"{\n"
" TEST test;\n"
" test.a[9][5] = 4;\n"
" test.a[0][50] = 4;\n"
" TEST *ptest;\n"
" ptest = &test;\n"
" ptest->a[9][5] = 4;\n"
" ptest->a[0][50] = 4;\n"
"}");
ASSERT_EQUALS("[test.cpp:8]: (error) Array 'test.a[10][5]' index test.a[9][5] out of bounds.\n"
"[test.cpp:9]: (error) Array 'test.a[10][5]' index test.a[0][50] out of bounds.\n"
"[test.cpp:12]: (error) Array 'ptest->a[10][5]' index ptest->a[9][5] out of bounds.\n"
"[test.cpp:13]: (error) Array 'ptest->a[10][5]' index ptest->a[0][50] out of bounds.\n"
"[test.cpp:12]: (error) Array 'ptest.a[10][5]' index ptest.a[9][5] out of bounds.\n"
"[test.cpp:13]: (error) Array 'ptest.a[10][5]' index ptest.a[0][50] out of bounds.\n", errout.str());
}
void array_index_35() { // ticket #2889
check("void f() {\n"
" struct Struct { unsigned m_Var[1]; } s;\n"
" s.m_Var[1] = 1;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Array 's.m_Var[1]' accessed at index 1, which is out of bounds.\n", errout.str());
check("struct Struct { unsigned m_Var[1]; };\n"
"void f() {\n"
" struct Struct s;\n"
" s.m_Var[1] = 1;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 's.m_Var[1]' accessed at index 1, which is out of bounds.\n", errout.str());
check("struct Struct { unsigned m_Var[1]; };\n"
"void f() {\n"
" struct Struct * s = calloc(40);\n"
" s->m_Var[1] = 1;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void array_index_36() { // ticket #2960
check("class Fred {\n"
" Fred(const Fred &);\n"
"private:\n"
" bool m_b[2];\n"
"};\n"
"Fred::Fred(const Fred & rhs) {\n"
" m_b[2] = rhs.m_b[2];\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (error) Array 'm_b[2]' accessed at index 2, which is out of bounds.\n"
"[test.cpp:7]: (error) Array 'rhs.m_b[2]' accessed at index 2, which is out of bounds.\n", errout.str());
}
void array_index_37() {
check("class Fred {\n"
" char x[X];\n"
" Fred() {\n"
" for (unsigned int i = 0; i < 15; i++)\n"
" i;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void array_index_38() { //ticket #3273
check("void aFunction() {\n"
" double aDoubleArray[ 10 ];\n"
" unsigned int i; i = 0;\n"
" for( i = 0; i < 6; i++ )\n"
" {\n"
" unsigned int j; j = 0;\n"
" for( j = 0; j < 5; j++ )\n"
" {\n"
" unsigned int x; x = 0;\n"
" for( x = 0; x < 4; x++ )\n"
" {\n"
" }\n"
" }\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void array_index_39() { // ticket 3387
check("void aFunction()\n"
"{\n"
" char a[10];\n"
" a[10] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[10]' accessed at index 10, which is out of bounds.\n", errout.str());
}
void array_index_40() {
check("void f() {\n"
" char a[10];\n"
" for (int i = 0; i < 10; ++i)\n"
" f2(&a[i + 1]);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void array_index_41() {
// Don't generate false positives when structs have the same name
check("void a() {\n"
" struct Fred { char data[6]; } fred;\n"
" fred.data[4] = 0;\n" // <- no error
"}\n"
"\n"
"void b() {\n"
" struct Fred { char data[3]; } fred;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void a() {\n"
" struct Fred { char data[6]; } fred;\n"
" fred.data[4] = 0;\n" // <- no error
"}\n"
"\n"
"void b() {\n"
" struct Fred { char data[3]; } fred;\n"
" fred.data[4] = 0;\n" // <- error
"}");
ASSERT_EQUALS("[test.cpp:8]: (error) Array 'fred.data[3]' accessed at index 4, which is out of bounds.\n", errout.str());
}
void array_index_42() { // ticket #3569
check("void f()\n"
"{\n"
" char *p; p = malloc(10);\n"
" p[10] = 7;\n"
" free(p);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'p[10]' accessed at index 10, which is out of bounds.\n", errout.str());
check("void f()\n"
"{\n"
" char *p; p = malloc(10);\n"
" p[0] = 0;\n"
" p[9] = 9;\n"
" free(p);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char *p; p = new char[10];\n"
" p[0] = 0;\n"
" p[9] = 9;\n"
" delete [] p;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char *p(new char[10]);\n"
" p[0] = 0;\n"
" p[9] = 9;\n"
" delete [] p;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char *p = NULL;"
" try{\n"
" p = new char[10];\n"
" }\n"
" catch(...){\n"
" return;\n"
" }"
" p[0] = 0;\n"
" p[9] = 9;\n"
" delete [] p;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void array_index_43() { // #3838
check("int f( )\n"
"{\n"
" struct {\n"
" int arr[ 3 ];\n"
" } var[ 1 ];\n"
" int y;\n"
" var[ 0 ].arr[ 0 ] = 0;\n"
" var[ 0 ].arr[ 1 ] = 1;\n"
" var[ 0 ].arr[ 2 ] = 2;\n"
" y = var[ 0 ].arr[ 3 ];\n" // <-- array access out of bounds
" return y;\n"
"}");
ASSERT_EQUALS("[test.cpp:10]: (error) Array 'var[0].arr[3]' accessed at index 3, which is out of bounds.\n"
"[test.cpp:10]: (error) Array 'var.arr[3]' accessed at index 3, which is out of bounds.\n", errout.str());
check("int f( )\n"
"{\n"
" struct {\n"
" int arr[ 3 ];\n"
" } var[ 1 ];\n"
" int y=1;\n"
" var[ 0 ].arr[ 0 ] = 0;\n"
" var[ 0 ].arr[ 1 ] = 1;\n"
" var[ 0 ].arr[ 2 ] = 2;\n"
" y = var[ 0 ].arr[ 2 ];\n"
" return y;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int f( ){ \n"
"struct Struct{\n"
" int arr[ 3 ];\n"
"};\n"
"int y;\n"
"Struct var;\n"
"var.arr[ 0 ] = 0;\n"
"var.arr[ 1 ] = 1;\n"
"var.arr[ 2 ] = 2;\n"
"var.arr[ 3 ] = 3;\n" // <-- array access out of bounds
"y=var.arr[ 3 ];\n" // <-- array access out of bounds
"return y;\n"
"}");
ASSERT_EQUALS("[test.cpp:10]: (error) Array 'var.arr[3]' accessed at index 3, which is out of bounds.\n"
"[test.cpp:11]: (error) Array 'var.arr[3]' accessed at index 3, which is out of bounds.\n", errout.str());
check("void f( ) {\n"
"struct S{\n"
" int var[ 3 ];\n"
"} ;\n"
"S var[2];\n"
"var[0].var[ 0 ] = 0;\n"
"var[0].var[ 1 ] = 1;\n"
"var[0].var[ 2 ] = 2;\n"
"var[0].var[ 4 ] = 4;\n" // <-- array access out of bounds
"}");
ASSERT_EQUALS("[test.cpp:9]: (error) Array 'var[0].var[3]' accessed at index 4, which is out of bounds.\n"
"[test.cpp:9]: (error) Array 'var.var[3]' accessed at index 4, which is out of bounds.\n", errout.str());
check("void f( ) {\n"
"struct S{\n"
" int var[ 3 ];\n"
"} ;\n"
"S var[2];\n"
"var[0].var[ 0 ] = 0;\n"
"var[0].var[ 1 ] = 1;\n"
"var[0].var[ 2 ] = 2;\n"
"}");
ASSERT_EQUALS("", errout.str());
// avoid FPs (modified examples taken from #3838)
check("struct AB { int a[10]; int b[10]; };\n"
"int main() {\n"
" struct AB ab;\n"
" int * p = &ab.a[10]; \n"
" return 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct AB { int a[10]; int b[10]; };\n"
"int main() {\n"
" struct AB ab[1];\n"
" int * p = &ab[0].a[10]; \n"
" return 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct AB { int a[10]; int b[10]; };\n"
"int main() {\n"
" struct AB ab[1];\n"
" int * p = &ab[10].a[0]; \n"
" return 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'ab[1]' accessed at index 10, which is out of bounds.\n", errout.str());
}
void array_index_44() { // #3979 (false positive)
check("void f()\n"
"{\n"
" char buf[2];\n"
" int i;\n"
" for (i = 2; --i >= 0; )\n"
" {\n"
" buf[i] = 1;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" double buf[2];\n"
" for (int i = 2; i--; )\n"
" {\n"
" buf[i] = 2.;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void array_index_45() { // #4207 - handling of function with variable number of parameters / unnamed arguments
// Variable number of arguments
check("void f(const char *format, ...) {\n"
" va_args args;\n"
" va_start(args, format);\n"
"}\n"
"void test() {\n"
" CHAR buffer[1024];\n"
" f(\"%s\", buffer);\n"
"}");
ASSERT_EQUALS("", errout.str());
// Unnamed argument
check("void f(char *) {\n"
" dostuff();\n"
"}\n"
"void test() {\n"
" char buffer[1024];\n"
" f(buffer);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// Two statement for-loop
void array_index_46() {
// #4840
check("void bufferAccessOutOfBounds2() {\n"
" char *buffer[]={\"a\",\"b\",\"c\"};\n"
" for(int i=3; i--;) {\n"
" printf(\"files(%i): %s\", 3-i, buffer[3-i]);\n"
" }\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:4]: (error) Array 'buffer[3]' accessed at index 3, which is out of bounds.\n", "", errout.str());
check("void f() {\n"
" int buffer[9];\n"
" long int i;\n"
" for(i=10; i--;) {\n"
" buffer[i] = i;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'buffer[9]' accessed at index 9, which is out of bounds.\n", errout.str());
// Correct access limits -> i from 9 to 0
check("void f() {\n"
" int buffer[10];\n"
" for(unsigned long int i=10; i--;) {\n"
" buffer[i] = i;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void array_index_47() {
// #5849
check("int s[4];\n"
"void f() {\n"
" for (int i = 2; i < 0; i++)\n"
" s[i] = 5; \n"
"}");
ASSERT_EQUALS("", errout.str());
}
void array_index_multidim() {
check("void f()\n"
"{\n"
" char a[2][2];\n"
" a[1][1] = 'a';\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char a[2][2][2];\n"
" a[1][1][1] = 'a';\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char a[2][2];\n"
" a[2][1] = 'a';\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[2][2]' index a[2][1] out of bounds.\n", errout.str());
check("void f()\n"
"{\n"
" char a[2][2];\n"
" a[1][2] = 'a';\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[2][2]' index a[1][2] out of bounds.\n", errout.str());
check("void f()\n"
"{\n"
" char a[2][2][2];\n"
" a[2][1][1] = 'a';\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[2][2][2]' index a[2][1][1] out of bounds.\n", errout.str());
check("void f()\n"
"{\n"
" char a[2][2][2];\n"
" a[1][2][1] = 'a';\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[2][2][2]' index a[1][2][1] out of bounds.\n", errout.str());
check("void f()\n"
"{\n"
" char a[2][2][2][2];\n"
" a[1][2][1][1] = 'a';\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[2][2][2][2]' index a[1][2][1][1] out of bounds.\n", errout.str());
check("void f()\n"
"{\n"
" char a[2][2][2];\n"
" a[1][1][2] = 'a';\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[2][2][2]' index a[1][1][2] out of bounds.\n", errout.str());
check("void f()\n"
"{\n"
" char a[10][10][10];\n"
" a[2*3][4*3][2] = 'a';\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[10][10][10]' index a[6][12][2] out of bounds.\n", errout.str());
check("void f() {\n"
" char a[10][10][10];\n"
" a[6][40][10] = 'a';\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Array 'a[10][10][10]' index a[6][40][10] out of bounds.\n", errout.str());
check("void f() {\n"
" char a[1][1][1];\n"
" a[2][2][2] = 'a';\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Array 'a[1][1][1]' index a[2][2][2] out of bounds.\n", errout.str());
check("void f() {\n"
" char a[6][6][6];\n"
" a[6][6][2] = 'a';\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Array 'a[6][6][6]' index a[6][6][2] out of bounds.\n", errout.str());
check("void f() {\n"
" int a[2][2];\n"
" p = &a[2][0];\n"
"}");
ASSERT_EQUALS("", errout.str());
// unknown dim..
check("void f()\n"
"{\n"
" int a[2][countof(x)] = {{1,2},{3,4}};\n"
" a[0][0] = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void draw_quad(float z) {\n"
" int i;\n"
" float (*vertices)[2][4];\n"
" vertices[0][0][0] = z;\n"
" vertices[0][0][1] = z;\n"
" vertices[1][0][0] = z;\n"
" vertices[1][0][1] = z;\n"
" vertices[2][0][0] = z;\n"
" vertices[2][0][1] = z;\n"
" vertices[3][0][0] = z;\n"
" vertices[3][0][1] = z;\n"
" for (i = 0; i < 4; i++) {\n"
" vertices[i][0][2] = z;\n"
" vertices[i][0][3] = 1.0;\n"
" vertices[i][1][0] = 2.0;\n"
" vertices[i][1][1] = 3.0;\n"
" vertices[i][1][2] = 4.0;\n"
" vertices[i][1][3] = 5.0;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
{
check("int foo() {\n"
" const size_t A = 4;\n"
" const size_t B = 2;\n"
" extern int stuff[A][B];\n"
" return stuff[0][1];\n"
"}");
ASSERT_EQUALS("", errout.str());
// TODO: better handling of VLAs in symboldatabase. should be
// possible to use ValueFlow values.
check("int foo() {\n"
" const size_t A = 4;\n"
" const size_t B = 2;\n"
" extern int stuff[A][B];\n"
" return stuff[0][1];\n"
"}");
TODO_ASSERT_EQUALS("error", "", errout.str());
}
}
void array_index_switch_in_for() {
check("void f()\n"
"{\n"
" int ar[10];\n"
" for (int i = 0; i < 10; ++i)\n"
" {\n"
" switch(i)\n"
" {\n"
" case 9:\n"
" ar[i] = 0;\n"
" break;\n"
" default:\n"
" ar[i] = ar[i+1];\n"
" break;\n"
" };\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" int ar[10];\n"
" for (int i = 0; i < 10; ++i)\n"
" {\n"
" switch(i)\n"
" {\n"
" case 8:\n"
" ar[i] = 0;\n"
" break;\n"
" default:\n"
" ar[i] = ar[i+1];\n"
" break;\n"
" };\n"
" }\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:12]: (error) Array index out of bounds.\n", "", errout.str());
}
void array_index_for_in_for() {
check("void f() {\n"
" int a[5];\n"
" for (int i = 0; i < 10; ++i) {\n"
" for (int j = i; j < 5; ++j) {\n"
" a[i] = 0;\n"
" }\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void array_index_calculation() {
// #1193 - false negative: array out of bounds in loop when there is calculation
check("void f()\n"
"{\n"
" char data[8];\n"
" for (int i = 19; i < 36; ++i) {\n"
" data[i/2] = 0;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'data[8]' accessed at index 17, which is out of bounds.\n", errout.str());
// #2199 - false negative: array out of bounds in loop when there is calculation
check("void f()\n"
"{\n"
" char arr[5];\n"
" for (int i = 0; i < 5; ++i) {\n"
" arr[i + 7] = 0;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'arr[5]' accessed at index 11, which is out of bounds.\n", errout.str());
}
void array_index_negative1() {
// #948 - array index out of bound not detected 'a[-1] = 0'
check("void f()\n"
"{\n"
" char data[8];\n"
" data[-1] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array index -1 is out of bounds.\n", errout.str());
check("void f()\n"
"{\n"
" char data[8][4];\n"
" data[5][-1] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array index -1 is out of bounds.\n", errout.str());
// #1614 - negative index is ok for pointers
check("void foo(char *p)\n"
"{\n"
" p[-1] = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" char s[] = \"abc\";\n"
" char *p = s + strlen(s);\n"
" if (p[-1]);\n"
"}");
ASSERT_EQUALS("", errout.str());
// ticket #1850
check("int f(const std::map<int, std::map<int,int> > &m)\n"
"{\n"
" return m[0][-1];\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void array_index_negative2() { // ticket #3063
check("struct TEST { char a[10]; };\n"
"void foo() {\n"
" TEST test;\n"
" test.a[-1] = 3;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'test.a[10]' accessed at index -1, which is out of bounds.\n", errout.str());
}
void array_index_for_decr() {
check("void f()\n"
"{\n"
" char data[8];\n"
" for (int i = 10; i > 0; --i) {\n"
" data[i] = 0;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'data[8]' accessed at index 10, which is out of bounds.\n", errout.str());
check("void f()\n"
"{\n"
" char val[5];\n"
" for (unsigned int i = 3; i < 5; --i) {\n"
" val[i+1] = val[i];\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char val[5];\n"
" for (int i = 3; i < 5; --i) {\n"
" val[i+1] = val[i];\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Array index -9994 is out of bounds.\n"
"[test.cpp:5]: (error) Array index -9995 is out of bounds.\n", errout.str());
}
void array_index_varnames() {
check("struct A {\n"
" char data[4];\n"
" struct B { char data[3]; };\n"
" B b;\n"
"};\n"
"\n"
"void f()\n"
"{\n"
" A a;\n"
" a.data[3] = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void array_index_for_andand_oror() { // #3907 - using && or ||
check("void f() {\n"
" char data[2];\n"
" int x;\n"
" for (x = 0; x < 10 && y; x++) {\n"
" data[x] = 0;\n"
" }"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'data[2]' accessed at index 9, which is out of bounds.\n", errout.str());
check("void f() {\n"
" char data[2];\n"
" int x;\n"
" for (x = 0; x < 10 || y; x++) {\n"
" data[x] = 0;\n"
" }"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'data[2]' accessed at index 9, which is out of bounds.\n", errout.str());
check("void f() {\n"
" char data[2];\n"
" int x;\n"
" for (x = 0; x <= 10 && y; x++) {\n"
" data[x] = 0;\n"
" }"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'data[2]' accessed at index 10, which is out of bounds.\n", errout.str());
check("void f() {\n"
" char data[2];\n"
" int x;\n"
" for (x = 0; y && x <= 10; x++) {\n"
" data[x] = 0;\n"
" }"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'data[2]' accessed at index 10, which is out of bounds.\n", errout.str());
}
void array_index_for_continue() {
// #3913
check("void f() {\n"
" int a[2];\n"
" for (int i = 0; i < 2; ++i) {\n"
" if (i == 0) {\n"
" continue;\n"
" }\n"
" a[i - 1] = 0;\n"
" }\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int a[2];\n"
" for (int i = 0; i < 2; ++i) {\n"
" if (somecondition) {\n"
" continue;\n"
" }\n"
" a[i - 1] = 0;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (error) Array index -1 is out of bounds.\n", errout.str());
}
void array_index_for() {
// Ticket #2370 - No false negative when there is no "break"
check("void f() {\n"
" int a[10];\n"
" for (int i = 0; i < 20; ++i) {\n"
" if (i==1) {\n"
" }\n"
" a[i] = 0;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (error) Array 'a[10]' accessed at index 19, which is out of bounds.\n", errout.str());
// Ticket #2385 - No false positive
check("void f() {\n"
" int a[10];\n"
" for (int i = 0; i < 20; ++i) {\n"
" if (i<10) {\n"
" } else {\n"
" a[i-10] = 0;\n"
" }\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
// Ticket #3893 - start value out of bounds
check("void f() {\n"
" int a[10];\n"
" for (int i = 10; somecondition; dosomething) {\n"
" a[i] = 0;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[10]' accessed at index 10, which is out of bounds.\n", errout.str());
}
void array_index_for_neq() {
// Ticket #2211 - for loop using != in the condition
check("void f() {\n"
" int a[5];\n"
" for (int i = 0; i != 10; ++i) {\n"
" a[i] = 0;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[5]' accessed at index 9, which is out of bounds.\n",
errout.str());
}
void array_index_for_question() {
// Ticket #2561 - using ?: inside for loop
check("void f() {\n"
" int a[10];\n"
" for (int i = 0; i != 10; ++i) {\n"
" i == 0 ? 0 : a[i-1];\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int a[10];\n"
" for (int i = 0; i != 10; ++i) {\n"
" some_condition ? 0 : a[i-1];\n"
" }\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:4]: (error) Array index -1 is out of bounds.\n", "", errout.str());
check("void f() {\n"
" int a[10];\n"
" for (int i = 0; i != 10; ++i) {\n"
" i==0 ? 0 : a[i-1];\n"
" a[i-1] = 0;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Array index -1 is out of bounds.\n", errout.str());
}
void array_index_for_varid0() { // #4228: No varid for counter variable
check("void f() {\n"
" char a[10];\n"
" for (i=0; i<10; i++);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void array_index_vla_for() {
// #3221 - access VLA inside for
check("void f(int len) {\n"
" char a[len];\n"
" for (int i=0; i<7; ++i) {\n"
" a[0] = 0;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void array_index_extern() {
// Ticket #1684. FP when using 'extern'.
check("extern char arr[15];\n"
"char arr[15] = \"abc\";");
ASSERT_EQUALS("", errout.str());
}
void array_index_cast() {
// Ticket #2841. FP when using cast.
// Different types => no error
check("void f1(char *buf) {\n"
" buf[4] = 0;\n"
"}\n"
"void f2() {\n"
" int x[2];\n"
" f1(x);\n"
"}");
ASSERT_EQUALS("", errout.str());
// Same type => error
check("void f1(const char buf[]) {\n"
" char c = buf[4];\n"
"}\n"
"void f2() {\n"
" char x[2];\n"
" f1(x);\n"
"}");
ASSERT_EQUALS("[test.cpp:6] -> [test.cpp:2]: (error) Array 'x[2]' accessed at index 4, which is out of bounds.\n", errout.str());
}
void array_index_string_literal() {
check("void f() {\n"
" const char *str = \"abc\";\n"
" bar(str[10]);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Array 'str[4]' accessed at index 10, which is out of bounds.\n", errout.str());
check("void f()\n"
"{\n"
" const char *str = \"abc\";\n"
" bar(str[4]);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'str[4]' accessed at index 4, which is out of bounds.\n", errout.str());
check("void f()\n"
"{\n"
" const char *str = \"abc\";\n"
" bar(str[3]);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" const char *str = \"a\tc\";\n"
" bar(str[4]);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'str[4]' accessed at index 4, which is out of bounds.\n", errout.str());
check("void f() {\n" // #6973
" const char *name = \"\";\n"
" if ( name[0] == 'U' ? name[1] : 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int main(int argc, char **argv) {\n"
" char str[6] = \"\\0\";\n"
" unsigned short port = 65535;\n"
" snprintf(str, sizeof(str), \"%hu\", port);\n"
"}", settings0, "test.c");
ASSERT_EQUALS("", errout.str());
}
void array_index_same_struct_and_var_name() {
// don't throw internal error
check("struct tt {\n"
" char name[21];\n"
"} ;\n"
"void doswitch(struct tt *x)\n"
"{\n"
" struct tt *tt=x;\n"
" tt->name;\n"
"}");
ASSERT_EQUALS("", errout.str());
// detect error
check("struct tt {\n"
" char name[21];\n"
"} ;\n"
"void doswitch(struct tt *x)\n"
"{\n"
" struct tt *tt=x;\n"
" tt->name[22] = 123;\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (error) Array 'tt->name[21]' accessed at index 22, which is out of bounds.\n"
"[test.cpp:7]: (error) Array 'tt.name[21]' accessed at index 22, which is out of bounds.\n", errout.str());
}
void array_index_valueflow() {
check("void f(int i) {\n"
" char str[3];\n"
" str[i] = 0;\n"
" if (i==10) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (warning) Either the condition 'i==10' is redundant or the array 'str[3]' is accessed at index 10, which is out of bounds.\n", errout.str());
check("void f(int i) {\n"
" char str[3];\n"
" str[i] = 0;\n"
" switch (i) {\n"
" case 10: break;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:5]: (warning) Either the switch case 'case 10' is redundant or the array 'str[3]' is accessed at index 10, which is out of bounds.\n", errout.str());
check("void f() {\n"
" char str[3];\n"
" str[((unsigned char)3) - 1] = 0;\n"
"}", false, "test.cpp");
ASSERT_EQUALS("", errout.str());
check("void f() {\n" // #5416 FP
" char *str[3];\n"
" do_something(&str[0][5]);\n"
"}", false, "test.cpp");
ASSERT_EQUALS("", errout.str());
check("class X { static const int x[100]; };\n" // #6070
"const int X::x[100] = {0};", false, "test.cpp");
ASSERT_EQUALS("", errout.str());
check("namespace { class X { static const int x[100]; };\n" // #6232
"const int X::x[100] = {0}; }", false, "test.cpp");
ASSERT_EQUALS("", errout.str());
}
void array_index_valueflow_pointer() {
check("void f() {\n"
" int a[10];\n"
" int *p = a;\n"
" p[20] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (error) Array 'a[10]' accessed at index 20, which is out of bounds.\n", errout.str());
{
// address of
check("void f() {\n"
" int a[10];\n"
" int *p = a;\n"
" p[10] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (error) Array 'a[10]' accessed at index 10, which is out of bounds.\n", errout.str());
check("void f() {\n"
" int a[10];\n"
" int *p = a;\n"
" dostuff(&p[10]);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
check("void f() {\n"
" int a[X];\n" // unknown size
" int *p = a;\n"
" p[20] = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int a[2];\n"
" char *p = (char *)a;\n" // cast
" p[4] = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void array_index_function_parameter() {
check("void f(char a[10]) {\n"
" a[20] = 0;\n" // <- cppcheck warn here even though it's not a definite access out of bounds
"}");
ASSERT_EQUALS("[test.cpp:2]: (error) Array 'a[10]' accessed at index 20, which is out of bounds.\n", errout.str());
check("void f(char a[10]) {\n" // #6353 - reassign 'a'
" a += 4;\n"
" a[-1] = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void array_index_enum_array() { // #8439
check("enum E : unsigned int { e1, e2 };\n"
"void f() {\n"
" E arrE[] = { e1, e2 };\n"
" arrE[sizeof(arrE)] = e1;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'arrE[2]' accessed at index 8, which is out of bounds.\n", errout.str());
}
void buffer_overrun_2_struct() {
check("struct ABC\n"
"{\n"
" char str[5];\n"
"};\n"
"\n"
"static void f(struct ABC *abc)\n"
"{\n"
" strcpy( abc->str, \"abcdef\" );\n"
"}");
ASSERT_EQUALS("[test.cpp:8]: (error) Buffer is accessed out of bounds: abc.str\n", errout.str());
check("struct ABC\n"
"{\n"
" char str[5];\n"
"};\n"
"\n"
"static void f()\n"
"{\n"
" struct ABC abc;\n"
" strcpy( abc.str, \"abcdef\" );\n"
"}");
ASSERT_EQUALS("[test.cpp:9]: (error) Buffer is accessed out of bounds: abc.str\n", errout.str());
check("struct ABC\n"
"{\n"
" char str[5];\n"
"};\n"
"\n"
"static void f(struct ABC &abc)\n"
"{\n"
" strcpy( abc.str, \"abcdef\" );\n"
"}");
ASSERT_EQUALS("[test.cpp:8]: (error) Buffer is accessed out of bounds: abc.str\n", errout.str());
check("static void f()\n"
"{\n"
" struct ABC\n"
" {\n"
" char str[5];\n"
" } abc;\n"
" strcpy( abc.str, \"abcdef\" );\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (error) Buffer is accessed out of bounds: abc.str\n", errout.str());
check("static void f()\n"
"{\n"
" struct ABC\n"
" {\n"
" char str[5];\n"
" };\n"
" struct ABC *abc = malloc(sizeof(struct ABC));\n"
" strcpy( abc->str, \"abcdef\" );\n"
" free(abc);\n"
"}");
ASSERT_EQUALS("[test.cpp:8]: (error) Buffer is accessed out of bounds: abc.str\n", errout.str());
}
void buffer_overrun_3() {
check("int a[10];\n"
"\n"
"void foo()\n"
"{\n"
" int i;\n"
" for (i = 0; i <= 10; ++i)\n"
" a[i] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (error) Array 'a[10]' accessed at index 10, which is out of bounds.\n", errout.str());
}
void buffer_overrun_4() {
check("void foo()\n"
"{\n"
" const char *p[2];\n"
" for (int i = 0; i < 8; ++i)\n"
" p[i] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'p[2]' accessed at index 7, which is out of bounds.\n", errout.str());
// No false positive
check("void foo(int x, int y)\n"
"{\n"
" const char *p[2];\n"
" const char *s = y + p[1];\n"
" p[1] = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
// There is no error here
check("void f1(char *s,int size)\n"
"{\n"
" if( size > 10 ) strcpy(s,\"abc\");\n"
"}\n"
"void f2()\n"
"{\n"
" char s[3];\n"
" f1(s,20);\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:8] -> [test.cpp:3]: (error) Buffer is accessed out of bounds.\n", "", errout.str());
check("void f1(char *s,int size)\n"
"{\n"
" if( size > 10 ) strcpy(s,\"abc\");\n"
"}\n"
"void f2()\n"
"{\n"
" char s[3];\n"
" f1(s,3);\n"
"}\n", false);
ASSERT_EQUALS("", errout.str());
}
void buffer_overrun_5() {
check("void f()\n"
"{\n"
" char n[5];\n"
" sprintf(n, \"d\");\n"
" printf(\"hello!\");\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void buffer_overrun_6() {
check("void f()\n"
"{\n"
" char n[5];\n"
" strcat(n, \"abc\");\n"
" strcat(n, \"def\");\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Buffer is accessed out of bounds: n\n", errout.str());
}
void buffer_overrun_7() {
// ticket #731
check("void f()\n"
"{\n"
" char a[2];\n"
" strcpy(a, \"a\\0\");\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void buffer_overrun_8() {
// ticket #714
check("void f()\n"
"{\n"
" char a[5];\n"
" for (int i = 0; i < 20; i = i + 100)\n"
" {\n"
" a[i] = 0;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char a[5];\n"
" for (int i = 0; i < 20; i = 100 + i)\n"
" {\n"
" a[i] = 0;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void buffer_overrun_9() {
// ticket #738
check("void f()\n"
"{\n"
" char a[5];\n"
" for (int i = 0; i < 20; )\n"
" {\n"
" a[i] = 0;\n"
" i += 100;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void buffer_overrun_10() {
// ticket #740
check("void f()\n"
"{\n"
" char a[4];\n"
" for (int i = 0; i < 4; i++)\n"
" {\n"
" char b = a[i];\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void buffer_overrun_11() {
check("void f()\n"
"{\n"
" char a[4];\n"
" for (float i=0; i<10.0;i=i+0.1)\n"
" {\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char a[4];\n"
" for (float i=0; i<10.0;i=0.1+i)\n"
" {\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void buffer_overrun_15() { // ticket #1787
check("class A : public B {\n"
" char val[2];\n"
" void f(int i, int ii);\n"
"};\n"
"void A::f(int i, int ii)\n"
"{\n"
" strcpy(val, \"ab\") ;\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (error) Buffer is accessed out of bounds: val\n", errout.str());
}
void buffer_overrun_16() {
// unknown types
check("void f() {\n"
" struct Foo foo[5];\n"
" memset(foo, 0, sizeof(foo));\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n" // ticket #2093
" gchar x[3];\n"
" strcpy(x, \"12\");\n"
"}");
ASSERT_EQUALS("", errout.str());
check("extern char a[10];\n"
"void f() {\n"
" char b[25] = {0};\n"
" std::memcpy(b, a, 10);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void buffer_overrun_18() { // ticket #2576
check("class A {\n"
" void foo();\n"
" bool b[7];\n"
"};\n"
"\n"
"void A::foo() {\n"
" for (int i=0; i<6; i++) {\n"
" b[i] = b[i+1];\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("class A {\n"
" void foo();\n"
" bool b[7];\n"
"};\n"
"\n"
"void A::foo() {\n"
" for (int i=0; i<7; i++) {\n"
" b[i] = b[i+1];\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:8]: (error) Array 'b[7]' accessed at index 7, which is out of bounds.\n", errout.str());
}
void buffer_overrun_19() { // #2597 - class member with unknown type
check("class A {\n"
"public:\n"
" u8 buf[10];\n"
" A();"
"};\n"
"\n"
"A::A() {\n"
" memset(buf, 0, 10);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void buffer_overrun_21() {
check("void foo()\n"
"{ { {\n"
" char dst[4];\n"
" const char *src = \"AAAAAAAAAAAAAAAAAAAAA\";\n"
" for (size_t i = 0; i <= 4; i++)\n"
" dst[i] = src[i];\n"
"} } }\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Array 'dst[4]' accessed at index 4, which is out of bounds.\n", errout.str());
}
void buffer_overrun_24() { // index variable is changed in for-loop
// ticket #4106
check("void main() {\n"
" int array[] = {1,2};\n"
" int x = 0;\n"
" for( int i = 0; i<6; ) {\n"
" x += array[i];\n"
" i++; }\n"
"}");
TODO_ASSERT_EQUALS("error", "", errout.str());
// ticket #4096
check("void main() {\n"
" int array[] = {1,2};\n"
" int x = 0;\n"
" for( int i = 0; i<6; ) {\n"
" x += array[i++];\n"
" }\n"
"}");
TODO_ASSERT_EQUALS("error", "", errout.str());
}
void buffer_overrun_26() { // ticket #4432 (segmentation fault)
check("extern int split();\n"
"void regress() {\n"
" char inbuf[1000];\n"
" char *f[10];\n"
" split(inbuf, f, 10, \"\t\t\");\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void buffer_overrun_27() { // ticket #4444 (segmentation fault)
check("void abc(struct foobar[5]);\n"
"void main() {\n"
"struct foobar x[5];\n"
"abc(x);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void buffer_overrun_28() {
check("char c = \"abc\"[4];");
ASSERT_EQUALS("[test.cpp:1]: (error) Buffer is accessed out of bounds: \"abc\"\n", errout.str());
check("p = &\"abc\"[4];");
ASSERT_EQUALS("", errout.str());
check("char c = \"\\0abc\"[2];");
ASSERT_EQUALS("", errout.str());
}
// #7083: false positive: typedef and initialization with strings
void buffer_overrun_29() {
check("typedef char testChar[10]; \n"
"int main(){ \n"
" testChar tc1 = \"\"; \n"
" tc1[5]='a'; \n"
"} \n"
);
ASSERT_EQUALS("", errout.str());
}
// #6367
void buffer_overrun_30() {
check("struct S { int m[9]; };\n"
"int f(S * s) {\n"
" return s->m[sizeof(s->m)];\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:3]: (error) Array 's->m[9]' accessed at index 36, which is out of bounds.\n"
"[test.cpp:3]: (error) Array 's.m[9]' accessed at index 36, which is out of bounds.\n",
errout.str());
}
void buffer_overrun_bailoutIfSwitch() {
// No false positive
check("void f1(char *s) {\n"
" if (x) s[100] = 0;\n"
"}\n"
"\n"
"void f2() {\n"
" char a[10];\n"
" f1(a);"
"}");
ASSERT_EQUALS("", errout.str());
// No false positive
check("void f1(char *s) {\n"
" if (x) return;\n"
" s[100] = 0;\n"
"}\n"
"\n"
"void f2() {\n"
" char a[10];\n"
" f1(a);"
"}");
ASSERT_EQUALS("", errout.str());
// No false negative
check("void f1(char *s) {\n"
" if (x) { }\n"
" s[100] = 0;\n"
"}\n"
"\n"
"void f2() {\n"
" char a[10];\n"
" f1(a);"
"}");
ASSERT_EQUALS("[test.cpp:8] -> [test.cpp:3]: (error) Array 'a[10]' accessed at index 100, which is out of bounds.\n", errout.str());
}
void buffer_overrun_function_array_argument() {
check("void f(char a[10]);\n"
"void g() {\n"
" char a[2];\n"
" f(a);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (warning) The array 'a' is too small, the function 'f' expects a bigger one.\n", errout.str());
check("void f(float a[10][20]);\n"
"void g() {\n"
" float a[2][3];\n"
" f(a);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (warning) The array 'a' is too small, the function 'f' expects a bigger one.\n", errout.str());
check("void f(char a[20]);\n"
"void g() {\n"
" int a[2];\n"
" f(a);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (warning) The array 'a' is too small, the function 'f' expects a bigger one.\n", errout.str());
check("void f(char a[20]);\n"
"void g() {\n"
" int a[5];\n"
" f(a);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(int a[]) {\n"
" switch (2) {\n"
" case 1:\n"
" a[1] = 1;\n"
" }\n"
"}\n"
"int a[1];\n"
"f(a);\n"
"");
ASSERT_EQUALS("", errout.str());
check("void CreateLeafTex(unsigned char buf[256][2048][4]);\n"
"void foo() {\n"
" unsigned char(* tree)[2048][4] = new unsigned char[256][2048][4];\n"
" CreateLeafTex(tree);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void possible_buffer_overrun_1() { // #3035
check("void foo() {\n"
" char * data = alloca(50);\n"
" char src[100];\n"
" memset(src, 'C', 99);\n"
" src[99] = '\\0';\n"
" strcat(data, src);\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (warning) Possible buffer overflow if strlen(src) is larger than sizeof(data)-strlen(data).\n", errout.str());
check("void foo() {\n"
" char * data = alloca(100);\n"
" char src[100];\n"
" memset(src, 'C', 99);\n"
" src[99] = '\\0';\n"
" strcat(data, src);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(char src[100]) {\n"
" char * data = alloca(50);\n"
" strcat(data, src);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) Possible buffer overflow if strlen(src) is larger than sizeof(data)-strlen(data).\n", errout.str());
check("void foo(char src[100]) {\n"
" char * data = alloca(100);\n"
" strcat(data, src);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo() {\n"
" char * data = alloca(50);\n"
" char src[100];\n"
" memset(src, 'C', 99);\n"
" src[99] = '\\0';\n"
" strcpy(data, src);\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (warning) Possible buffer overflow if strlen(src) is larger than or equal to sizeof(data).\n", errout.str());
check("void foo() {\n"
" char * data = alloca(100);\n"
" char src[100];\n"
" memset(src, 'C', 99);\n"
" src[99] = '\\0';\n"
" strcpy(data, src);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(char src[100]) {\n"
" char * data = alloca(50);\n"
" strcpy(data, src);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) Possible buffer overflow if strlen(src) is larger than or equal to sizeof(data).\n", errout.str());
check("void foo(char src[100]) {\n"
" char * data = alloca(100);\n"
" strcpy(data, src);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void buffer_overrun_readSizeFromCfg() {
Settings settings;
const char xmldata[] = "<?xml version=\"1.0\"?>\n"
"<def>\n"
" <podtype name=\"u8\" sign=\"u\" size=\"1\"/>\n"
" <function name=\"mystrcpy\">\n"
" <noreturn>false</noreturn>\n"
" <arg nr=\"1\">\n"
" <minsize type=\"strlen\" arg=\"2\"/>\n"
" </arg>\n"
" <arg nr=\"2\"/>\n"
" </function>\n"
"</def>";
tinyxml2::XMLDocument doc;
doc.Parse(xmldata, sizeof(xmldata));
settings.library.load(doc);
// Attempt to get size from Cfg files, no false positives if size is not specified
check("void f() {\n"
" u8 str[256];\n"
" mystrcpy(str, \"abcd\");\n"
"}", settings);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" u8 str[2];\n"
" mystrcpy(str, \"abcd\");\n"
"}", settings);
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer is accessed out of bounds: str\n", errout.str());
// The same for structs, where the message comes from a different check
check("void f() {\n"
" struct { u8 str[256]; } ms;\n"
" mystrcpy(ms.str, \"abcd\");\n"
"}", settings);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" struct { u8 str[2]; } ms;\n"
" mystrcpy(ms.str, \"abcd\");\n"
"}", settings);
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer is accessed out of bounds: ms.str\n", errout.str());
}
void valueflow_string() { // using ValueFlow string values in checking
check("char f() {\n"
" const char *x = s;\n"
" if (cond) x = \"abcde\";\n"
" return x[20];\n" // <- array index out of bounds when x is "abcde"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'x[6]' accessed at index 20, which is out of bounds.\n", errout.str());
}
void pointer_out_of_bounds_1() {
check("void f() {\n"
" char a[10];\n"
" char *p = a + 100;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (portability) Undefined behaviour, pointer arithmetic 'a+100' is out of bounds.\n", errout.str());
check("void f() {\n"
" char a[10];\n"
" return a + 100;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (portability) Undefined behaviour, pointer arithmetic 'a+100' is out of bounds.\n", errout.str());
check("void f(int i) {\n"
" char x[10];\n"
" if (i == 123) {}\n"
" dostuff(x+i);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (portability) Undefined behaviour, when 'i' is 123 the pointer arithmetic 'x+i' is out of bounds.\n", errout.str());
check("void f() {\n" // #6350 - fp when there is cast of buffer
" wchar_t buf[64];\n"
" p = (unsigned char *) buf + sizeof (buf);\n"
"}", false, "6350.c");
ASSERT_EQUALS("", errout.str());
}
void pointer_out_of_bounds_2() {
check("void f() {\n"
" char *p = malloc(10);\n"
" p += 100;\n"
" free(p);"
"}");
ASSERT_EQUALS("[test.cpp:3]: (portability) Undefined behaviour, pointer arithmetic 'p+100' is out of bounds.\n", errout.str());
check("void f() {\n"
" char *p = malloc(10);\n"
" p += 10;\n"
" *p = 0;\n"
" free(p);"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) p is out of bounds.\n", errout.str());
check("void f() {\n"
" char *p = malloc(10);\n"
" p += 10;\n"
" p -= 10;\n"
" *p = 0;\n"
" free(p);"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" char *p = malloc(10);\n"
" p += 10;\n"
" p = p - 1;\n"
" *p = 0;\n"
" free(p);"
"}");
ASSERT_EQUALS("", errout.str());
}
void pointer_out_of_bounds_3() {
check("struct S { int a[10]; };\n"
"void f(struct S *s) {\n"
" char *p = s->a + 100;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (portability) Undefined behaviour, pointer arithmetic 's->a+100' is out of bounds.\n", errout.str());
}
void pointer_out_of_bounds_sub() {
check("void f() {\n"
" char x[10];\n"
" return x-1;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (portability) Undefined behaviour, pointer arithmetic 'x-1' is out of bounds.\n", errout.str());
check("void f(int i) {\n"
" char x[10];\n"
" if (i == 123) {}\n"
" dostuff(x-i);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (portability) Undefined behaviour, when 'i' is 123 the pointer arithmetic 'x-i' is out of bounds.\n", errout.str());
check("void f(int i) {\n"
" char x[10];\n"
" if (i == -20) {}\n"
" dostuff(x-i);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (portability) Undefined behaviour, when 'i' is -20 the pointer arithmetic 'x-i' is out of bounds.\n", errout.str());
}
void strncat1() {
check("void f(char *a, char *b) {\n"
" char str[16];\n"
" strncpy(str, a, 10);\n"
" strncat(str, b, 10);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (warning) Dangerous usage of strncat - 3rd parameter is the maximum number of characters to append.\n", errout.str());
}
void strncat2() {
check("void f(char *a) {\n"
" char str[5];\n"
" strncat(str, a, 5);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) Dangerous usage of strncat - 3rd parameter is the maximum number of characters to append.\n", errout.str());
}
void strncat3() {
check("void f(char *a) {\n"
" char str[5];\n"
" strncat(str, \"foobar\", 5);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) Dangerous usage of strncat - 3rd parameter is the maximum number of characters to append.\n", errout.str());
}
void strcat1() {
check("struct Foo { char a[4]; };\n"
"void f() {\n"
" struct Foo x;\n"
" strcat(x.a, \"aa\");\n"
" strcat(x.a, \"aa\");\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Buffer is accessed out of bounds.\n", errout.str());
}
void strcat2() {
check("struct Foo { char a[5]; };\n"
"void f() {\n"
" struct Foo x;\n"
" strcat(x.a, \"aa\");\n"
" strcat(x.a, \"aa\");\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void strcat3() {
check("void f() {\n"
" INT str[10];\n"
" strcat(str, \"aa\");\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void varid1() {
check("void foo()\n"
"{\n"
" char str[10];\n"
" if (str[0])\n"
" {\n"
" char str[50];\n"
" str[30] = 0;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void varid2() { // #4764
check("struct foo {\n"
" void bar() { return; }\n"
" type<> member[1];\n"
"};");
ASSERT_EQUALS("", errout.str());
}
void assign1() {
check("char str[3] = {'a', 'b', 'c'};\n"
"\n"
"void foo()\n"
"{\n"
" str[3] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'str[3]' accessed at index 3, which is out of bounds.\n", errout.str());
}
void alloc_new() {
check("void foo()\n"
"{\n"
" char *s; s = new char[10];\n"
" s[10] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 's[10]' accessed at index 10, which is out of bounds.\n", errout.str());
// ticket #1670 - false negative when using return
check("char f()\n"
"{\n"
" char *s; s = new int[10];\n"
" return s[10];\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 's[10]' accessed at index 10, which is out of bounds.\n", errout.str());
check("struct Fred { char c[10]; };\n"
"char f()\n"
"{\n"
" Fred *f; f = new Fred;\n"
" return f->c[10];\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'f->c[10]' accessed at index 10, which is out of bounds.\n"
"[test.cpp:5]: (error) Array 'f.c[10]' accessed at index 10, which is out of bounds.\n", errout.str());
check("static const size_t MAX_SIZE = UNAVAILABLE_TO_CPPCHECK;\n"
"struct Thing { char data[MAX_SIZE]; };\n"
"char f4(const Thing& t) { return !t.data[0]; }");
ASSERT_EQUALS("", errout.str());
check("void foo() {\n"
" char * buf; buf = new char[8];\n"
" buf[7] = 0;\n"
" delete [] buf;\n"
" buf = new char[9];\n"
" buf[8] = 0;\n"
" delete [] buf;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo() {\n"
" char * buf; buf = new char[8];\n"
" buf[7] = 0;\n"
" delete [] buf;\n"
" buf = new char[9];\n"
" buf[9] = 0;\n"
" delete [] buf;\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (error) Array 'buf[9]' accessed at index 9, which is out of bounds.\n", errout.str());
check("void foo()\n"
"{\n"
" enum E { Size = 10 };\n"
" char *s; s = new char[Size];\n"
" s[Size] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 's[10]' accessed at index 10, which is out of bounds.\n", errout.str());
check("void foo()\n"
"{\n"
" enum E { };\n"
" E *e; e = new E[10];\n"
" e[10] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'e[10]' accessed at index 10, which is out of bounds.\n", errout.str());
}
// data is allocated with malloc
void alloc_malloc() {
check("void foo()\n"
"{\n"
" char *s; s = malloc(10);\n"
" s[10] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 's[10]' accessed at index 10, which is out of bounds.\n", errout.str());
// ticket #842
check("void f() {\n"
" int *tab4 = malloc(20 * sizeof(int));\n"
" tab4[20] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Array 'tab4[20]' accessed at index 20, which is out of bounds.\n", errout.str());
// ticket #1478
check("void foo() {\n"
" char *p = malloc(10);\n"
" free(p);\n"
" p = malloc(10);\n"
" p[10] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Array 'p[10]' accessed at index 10, which is out of bounds.\n", errout.str());
// ticket #1134
check("void f() {\n"
" int *x, i;\n"
" x = malloc(10 * sizeof(int));\n"
" x[10] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'x[10]' accessed at index 10, which is out of bounds.\n", errout.str());
check("void f() {\n"
" int *tab4; tab4 = malloc(20 * sizeof(int));\n"
" tab4[19] = 0;\n"
" free(tab4);\n"
" tab4 = malloc(21 * sizeof(int));\n"
" tab4[20] = 0;\n"
" free(tab4);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int *tab4 = malloc(20 * sizeof(int));\n"
" tab4[19] = 0;\n"
" tab4 = realloc(tab4,21 * sizeof(int));\n"
" tab4[20] = 0;\n"
" free(tab4);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" enum E { Size = 20 };\n"
" E *tab4 = malloc(Size * 4);\n"
" tab4[Size] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'tab4[20]' accessed at index 20, which is out of bounds.\n", errout.str());
check("void f() {\n"
" enum E { Size = 20 };\n"
" E *tab4 = malloc(4 * Size);\n"
" tab4[Size] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'tab4[20]' accessed at index 20, which is out of bounds.\n", errout.str());
check("void f() {\n"
" enum E { };\n"
" E *tab4 = malloc(20 * sizeof(E));\n"
" tab4[20] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'tab4[20]' accessed at index 20, which is out of bounds.\n", errout.str());
}
// statically allocated buffer
void alloc_string() {
check("void foo()\n"
"{\n"
" const char *s = \"123\";\n"
" s[10] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 's[4]' accessed at index 10, which is out of bounds.\n", errout.str());
check("void foo()\n"
"{\n"
" char *s; s = \"\";\n"
" s[10] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 's[1]' accessed at index 10, which is out of bounds.\n", errout.str());
check("void foo() {\n"
" const char *s = \"\";\n"
" s = y();\n"
" s[10] = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// data is allocated with alloca
void alloc_alloca() {
check("void foo()\n"
"{\n"
" char *s = alloca(10);\n"
" s[10] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Array 's[10]' accessed at index 10, which is out of bounds.\n", errout.str());
}
void countSprintfLength() const {
std::list<const Token*> unknownParameter;
unknownParameter.push_back(0);
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("Hello", unknownParameter));
ASSERT_EQUALS(2, CheckBufferOverrun::countSprintfLength("s", unknownParameter));
ASSERT_EQUALS(2, CheckBufferOverrun::countSprintfLength("i", unknownParameter));
ASSERT_EQUALS(2, CheckBufferOverrun::countSprintfLength("%d", unknownParameter));
ASSERT_EQUALS(2, CheckBufferOverrun::countSprintfLength("%1d", unknownParameter));
ASSERT_EQUALS(3, CheckBufferOverrun::countSprintfLength("%2.2d", unknownParameter));
ASSERT_EQUALS(1, CheckBufferOverrun::countSprintfLength("%s", unknownParameter));
ASSERT_EQUALS(2, CheckBufferOverrun::countSprintfLength("f%s", unknownParameter));
ASSERT_EQUALS(1, CheckBufferOverrun::countSprintfLength("%-s", unknownParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%-5s", unknownParameter));
ASSERT_EQUALS(2, CheckBufferOverrun::countSprintfLength("\\\"", unknownParameter));
ASSERT_EQUALS(7, CheckBufferOverrun::countSprintfLength("Hello \\0Text", unknownParameter));
ASSERT_EQUALS(1, CheckBufferOverrun::countSprintfLength("\\0", unknownParameter));
ASSERT_EQUALS(2, CheckBufferOverrun::countSprintfLength("%%", unknownParameter));
ASSERT_EQUALS(3, CheckBufferOverrun::countSprintfLength("%d%d", unknownParameter));
ASSERT_EQUALS(3, CheckBufferOverrun::countSprintfLength("\\\\a%s\\0a", unknownParameter));
ASSERT_EQUALS(10, CheckBufferOverrun::countSprintfLength("\\\\\\\\Hello%d \\0Text\\\\\\\\", unknownParameter));
ASSERT_EQUALS(4, CheckBufferOverrun::countSprintfLength("%%%%%d", unknownParameter));
Token strTok(0);
std::list<const Token*> stringAsParameter;
stringAsParameter.push_back(&strTok);
strTok.str("\"\"");
ASSERT_EQUALS(4, CheckBufferOverrun::countSprintfLength("str%s", stringAsParameter));
strTok.str("\"12345\"");
ASSERT_EQUALS(9, CheckBufferOverrun::countSprintfLength("str%s", stringAsParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%-4s", stringAsParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%-5s", stringAsParameter));
ASSERT_EQUALS(7, CheckBufferOverrun::countSprintfLength("%-6s", stringAsParameter));
ASSERT_EQUALS(5, CheckBufferOverrun::countSprintfLength("%.4s", stringAsParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%.5s", stringAsParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%.6s", stringAsParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%5.6s", stringAsParameter));
ASSERT_EQUALS(7, CheckBufferOverrun::countSprintfLength("%6.6s", stringAsParameter));
std::list<const Token*> intAsParameter;
Token numTok(0);
numTok.str("12345");
intAsParameter.push_back(&numTok);
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%02ld", intAsParameter));
ASSERT_EQUALS(9, CheckBufferOverrun::countSprintfLength("%08ld", intAsParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%.2d", intAsParameter));
ASSERT_EQUALS(9, CheckBufferOverrun::countSprintfLength("%08.2d", intAsParameter));
TODO_ASSERT_EQUALS(5, 2, CheckBufferOverrun::countSprintfLength("%x", intAsParameter));
ASSERT_EQUALS(5, CheckBufferOverrun::countSprintfLength("%4x", intAsParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%5x", intAsParameter));
ASSERT_EQUALS(5, CheckBufferOverrun::countSprintfLength("%.4x", intAsParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%.5x", intAsParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%1.5x", intAsParameter));
ASSERT_EQUALS(6, CheckBufferOverrun::countSprintfLength("%5.1x", intAsParameter));
std::list<const Token*> floatAsParameter;
Token floatTok(0);
floatTok.str("1.12345f");
floatAsParameter.push_back(&floatTok);
TODO_ASSERT_EQUALS(5, 3, CheckBufferOverrun::countSprintfLength("%.2f", floatAsParameter));
ASSERT_EQUALS(9, CheckBufferOverrun::countSprintfLength("%8.2f", floatAsParameter));
TODO_ASSERT_EQUALS(5, 3, CheckBufferOverrun::countSprintfLength("%2.2f", floatAsParameter));
std::list<const Token*> floatAsParameter2;
Token floatTok2(0);
floatTok2.str("100.12345f");
floatAsParameter2.push_back(&floatTok2);
TODO_ASSERT_EQUALS(7, 3, CheckBufferOverrun::countSprintfLength("%2.2f", floatAsParameter2));
TODO_ASSERT_EQUALS(7, 3, CheckBufferOverrun::countSprintfLength("%.2f", floatAsParameter));
TODO_ASSERT_EQUALS(7, 5, CheckBufferOverrun::countSprintfLength("%4.2f", floatAsParameter));
std::list<const Token*> multipleParams;
multipleParams.push_back(&strTok);
multipleParams.push_back(0);
multipleParams.push_back(&numTok);
ASSERT_EQUALS(15, CheckBufferOverrun::countSprintfLength("str%s%d%d", multipleParams));
ASSERT_EQUALS(26, CheckBufferOverrun::countSprintfLength("str%-6s%08ld%08ld", multipleParams));
}
void minsize_argvalue() {
Settings settings;
const char xmldata[] = "<?xml version=\"1.0\"?>\n"
"<def>\n"
" <function name=\"mymemset\">\n"
" <noreturn>false</noreturn>\n"
" <arg nr=\"1\">\n"
" <minsize type=\"argvalue\" arg=\"3\"/>\n"
" </arg>\n"
" <arg nr=\"2\"/>\n"
" <arg nr=\"3\"/>\n"
" </function>\n"
"</def>";
tinyxml2::XMLDocument doc;
doc.Parse(xmldata, sizeof(xmldata));
settings.library.load(doc);
settings.addEnabled("warning");
check("void f() {\n"
" char c[10];\n"
" mymemset(c, 0, 10);\n"
"}", settings);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" char c[10];\n"
" mymemset(c, 0, 11);\n"
"}", settings);
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer is accessed out of bounds: c\n", errout.str());
check("struct S {\n"
" char a[5];\n"
"};\n"
"void f() {\n"
" S s;\n"
" mymemset(s.a, 0, 10);\n"
"}", settings);
ASSERT_EQUALS("[test.cpp:6]: (error) Buffer is accessed out of bounds: s.a\n", errout.str());
check("void foo() {\n"
" char s[10];\n"
" mymemset(s, 0, '*');\n"
"}", settings);
ASSERT_EQUALS("[test.cpp:3]: (warning) The size argument is given as a char constant.\n", errout.str());
// ticket #836
check("void f(void) {\n"
" char a[10];\n"
" mymemset(a+5, 0, 10);\n"
"}", settings);
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer is accessed out of bounds: a\n", errout.str());
// Ticket #909
check("void f(void) {\n"
" char str[] = \"abcd\";\n"
" mymemset(str, 0, 10);\n"
"}", settings);
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer is accessed out of bounds: str\n", errout.str());
// ticket #1659 - overflowing variable when using memcpy
check("void f(void) { \n"
" char c;\n"
" mymemset(&c, 0, 4);\n"
"}", settings);
TODO_ASSERT_EQUALS("[test.cpp:3]: (error) Buffer is accessed out of bounds: c\n", "", errout.str());
// ticket #2121 - buffer access out of bounds when using uint32_t
check("void f(void) {\n"
" unknown_type_t buf[4];\n"
" mymemset(buf, 0, 100);\n"
"}", settings);
ASSERT_EQUALS("", errout.str());
// #3124 - multidimension array
check("int main() {\n"
" char b[5][6];\n"
" mymemset(b, 0, 5 * 6);\n"
"}", settings);
ASSERT_EQUALS("", errout.str());
check("int main() {\n"
" char b[5][6];\n"
" mymemset(b, 0, 6 * 6);\n"
"}", settings);
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer is accessed out of bounds: b\n", errout.str());
// #4968 - not standard function
check("void f() {\n"
" char str[3];\n"
" foo.mymemset(str, 0, 100);\n"
" foo::mymemset(str, 0, 100);\n"
" std::mymemset(str, 0, 100);\n"
"}", settings);
TODO_ASSERT_EQUALS("[test.cpp:5]: (error) Buffer is accessed out of bounds: str\n", "", errout.str());
// #5257 - check strings
check("void f() {\n"
" mymemset(\"abc\", 0, 20);\n"
"}", settings);
ASSERT_EQUALS("[test.cpp:2]: (error) Buffer is accessed out of bounds.\n", errout.str());
check("void f() {\n"
" mymemset(temp, \"abc\", 4);\n"
"}", settings);
ASSERT_EQUALS("", errout.str());
check("void f() {\n" // #6816 - fp when array has known string value
" const char c[10] = \"c\";\n"
" mymemset(c, 0, 10);\n"
"}", settings);
ASSERT_EQUALS("", errout.str());
}
void minsize_sizeof() {
Settings settings;
const char xmldata[] = "<?xml version=\"1.0\"?>\n"
"<def>\n"
" <function name=\"mystrncpy\">\n"
" <noreturn>false</noreturn>\n"
" <arg nr=\"1\">\n"
" <minsize type=\"sizeof\" arg=\"2\"/>\n"
" <minsize type=\"argvalue\" arg=\"3\"/>\n"
" </arg>\n"
" <arg nr=\"2\"/>\n"
" <arg nr=\"3\"/>\n"
" </function>\n"
"</def>";
tinyxml2::XMLDocument doc;
doc.Parse(xmldata, sizeof(xmldata));
settings.library.load(doc);
check("void f() {\n"
" char c[7];\n"
" mystrncpy(c, \"hello\", 7);\n"
"}", settings);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" char c[6];\n"
" mystrncpy(c,\"hello\",6);\n"
"}", settings);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" char c[5];\n"
" mystrncpy(c,\"hello\",6);\n"
"}", settings);
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer is accessed out of bounds: c\n", errout.str());
check("void f() {\n"
" char c[6];\n"
" mystrncpy(c,\"hello!\",7);\n"
"}", settings);
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer is accessed out of bounds: c\n", errout.str());
check("struct AB { char a[10]; };\n"
"void foo(AB *ab) {\n"
" mystrncpy(x, ab->a, 100);\n"
"}", settings);
ASSERT_EQUALS("", errout.str());
check("void a(char *p) { mystrncpy(p,\"hello world!\",10); }\n" // #3168
"void b() {\n"
" char buf[5];\n"
" a(buf);"
"}", settings);
ASSERT_EQUALS("[test.cpp:4] -> [test.cpp:1]: (error) Buffer is accessed out of bounds: buf\n", errout.str());
}
void minsize_strlen() {
Settings settings;
const char xmldata[] = "<?xml version=\"1.0\"?>\n"
"<def>\n"
" <function name=\"mysprintf\">\n"
" <noreturn>false</noreturn>\n"
" <formatstr/>\n"
" <arg nr=\"1\">\n"
" <minsize type=\"strlen\" arg=\"2\"/>\n"
" </arg>\n"
" <arg nr=\"2\">\n"
" <formatstr/>\n"
" </arg>\n"
" </function>\n"
"</def>";
tinyxml2::XMLDocument doc;
doc.Parse(xmldata, sizeof(xmldata));
settings.library.load(doc);
// formatstr..
check("void f() {\n"
" char str[3];\n"
" mysprintf(str, \"test\");\n"
"}", settings);
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer is accessed out of bounds: str\n", errout.str());
check("void f() {\n"
" char str[5];\n"
" mysprintf(str, \"%s\", \"abcde\");\n"
"}", settings);
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer is accessed out of bounds: str\n", errout.str());
check("int getnumber();\n"
"void f()\n"
"{\n"
" char str[5];\n"
" mysprintf(str, \"%d: %s\", getnumber(), \"abcde\");\n"
"}", settings);
ASSERT_EQUALS("[test.cpp:5]: (error) Buffer is accessed out of bounds: str\n", errout.str());
check("void f() {\n"
" char str[5];\n"
" mysprintf(str, \"test%s\", \"\");\n"
"}", settings);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" char *str = new char[5];\n"
" mysprintf(str, \"abcde\");\n"
"}", settings);
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer is accessed out of bounds.\n", errout.str());
check("void f(int condition) {\n"
" char str[5];\n"
" mysprintf(str, \"test%s\", condition ? \"12\" : \"34\");\n"
"}", settings);
ASSERT_EQUALS("", errout.str());
check("void f(int condition) {\n"
" char str[5];\n"
" mysprintf(str, \"test%s\", condition ? \"12\" : \"345\");\n"
"}", settings);
TODO_ASSERT_EQUALS("error", "", errout.str());
check("struct Foo { char a[1]; };\n"
"void f() {\n"
" struct Foo x;\n"
" mysprintf(x.a, \"aa\");\n"
"}", settings);
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer is accessed out of bounds: x.a\n", errout.str());
// ticket #900
check("void f() {\n"
" char *a = new char(30);\n"
" mysprintf(a, \"a\");\n"
"}", settings);
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer is accessed out of bounds.\n", errout.str());
check("void f(char value) {\n"
" char *a = new char(value);\n"
" mysprintf(a, \"a\");\n"
"}", settings);
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer is accessed out of bounds.\n", errout.str());
// This is out of bounds if 'sizeof(ABC)' is 1 (No padding)
check("struct Foo { char a[1]; };\n"
"void f() {\n"
" struct Foo *x = malloc(sizeof(Foo));\n"
" mysprintf(x.a, \"aa\");\n"
"}", settings);
TODO_ASSERT_EQUALS("error", "", errout.str());
check("struct Foo { char a[1]; };\n"
"void f() {\n"
" struct Foo *x = malloc(sizeof(Foo) + 10);\n"
" mysprintf(x.a, \"aa\");\n"
"}", settings);
ASSERT_EQUALS("", errout.str());
check("struct Foo {\n" // #6668 - unknown size
" char a[LEN];\n"
" void f();\n"
"};"
"void Foo::f() {\n"
" mysprintf(a, \"abcd\");\n"
"}", settings);
ASSERT_EQUALS("", errout.str());
}
void minsize_mul() {
Settings settings;
const char xmldata[] = "<?xml version=\"1.0\"?>\n"
"<def>\n"
" <function name=\"myfread\">\n"
" <arg nr=\"1\">\n"
" <minsize type=\"mul\" arg=\"2\" arg2=\"3\"/>\n"
" </arg>\n"
" <arg nr=\"2\"/>\n"
" <arg nr=\"3\"/>\n"
" <arg nr=\"4\"/>\n"
" </function>\n"
"</def>";
tinyxml2::XMLDocument doc;
doc.Parse(xmldata, sizeof(xmldata));
settings.library.load(doc);
check("void f() {\n"
" char c[5];\n"
" myfread(c, 1, 5, stdin);\n"
"}", settings);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" char c[5];\n"
" myfread(c, 1, 6, stdin);\n"
"}", settings);
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer is accessed out of bounds: c\n", errout.str());
}
void unknownType() {
check("void f()\n"
"{\n"
" UnknownType *a = malloc(4);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void terminateStrncpy1() {
check("void foo ( char *bar ) {\n"
" char baz[100];\n"
" strncpy(baz, bar, 100);\n"
" strncpy(baz, bar, 100);\n"
" baz[99] = 0;\n"
" strncpy(baz, bar, 100);\n"
" baz[99] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning, inconclusive) The buffer 'baz' may not be null-terminated after the call to strncpy().\n", errout.str());
check("void foo ( char *bar ) {\n"
" char baz[100];\n"
" strncpy(baz, bar, 100);\n"
" baz[99] = '\\0';\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo ( char *bar ) {\n"
" char baz[100];\n"
" strncpy(baz, bar, 100);\n"
" baz[x+1] = '\\0';\n"
"}");
ASSERT_EQUALS("", errout.str());
// Test with invalid code that there is no segfault
check("char baz[100];\n"
"strncpy(baz, \"var\", 100)\n");
ASSERT_EQUALS("", errout.str());
// Test that there are no duplicate error messages
check("void foo ( char *bar ) {\n"
" char baz[100];\n"
" strncpy(baz, bar, 100);\n"
" foo(baz);\n"
" foo(baz);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning, inconclusive) The buffer 'baz' may not be null-terminated after the call to strncpy().\n", errout.str());
}
void terminateStrncpy2() {
check("char *foo ( char *bar ) {\n"
" char baz[100];\n"
" strncpy(baz, bar, 100);\n"
" bar[99] = 0;\n"
" return baz;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning, inconclusive) The buffer 'baz' may not be null-terminated after the call to strncpy().\n", errout.str());
}
void terminateStrncpy3() {
// Ticket #2170 - false positive
// The function bar is risky. But it might work that way intentionally.
check("char str[100];\n"
"\n"
"void foo(char *a) {\n"
" strncpy(str, a, 100);\n"
"}\n"
"\n"
"void bar(char *p) {\n"
" strncpy(p, str, 100);\n"
"}\n", false);
ASSERT_EQUALS("[test.cpp:4]: (warning, inconclusive) The buffer 'str' may not be null-terminated after the call to strncpy().\n", errout.str());
}
void recursive_long_time() {
// Just test that recursive check doesn't take long time
check("char *f2 ( char *b )\n"
"{\n"
" f2( b );\n"
" f2( b );\n"
" f2( b );\n"
" f2( b );\n"
" f2( b );\n"
" f2( b );\n"
" f2( b );\n"
" f2( b );\n"
" f2( b );\n"
" f2( b );\n"
" f2( b );\n"
" f2( b );\n"
" f2( b );\n"
" f2( b );\n"
" f2( b );\n"
"}\n"
"void f()\n"
"{\n"
" char a[10];\n"
" f2(a);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// Ticket #1587 - crash
void crash1() {
check("struct struct A\n"
"{\n"
" int alloclen;\n"
"};\n"
"\n"
"void foo()\n"
"{\n"
" struct A *str;\n"
" str = malloc(4);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void crash2() {
check("void a(char *p) {\n"
" f( { if(finally_arg); } );\n"
"}\n"
"\n"
"void b() {\n"
" char arr[64];\n"
" a(arr);\n"
"}");
}
void crash3() {
check("struct b { unknown v[0]; };\n"
"void d() { struct b *f; f = malloc(108); }");
}
void executionPaths1() {
check("void f(int a)\n"
"{\n"
" int buf[10];\n"
" int i = 5;\n"
" if (a == 1)\n"
" i = 1000;\n"
" buf[i] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (error) Array 'buf[10]' accessed at index 1000, which is out of bounds.\n", errout.str());
check("void f(int a)\n"
"{\n"
" int buf[10][5];\n"
" int i = 5;\n"
" if (a == 1)\n"
" i = 1000;\n"
" buf[i][0] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (error) Array 'buf[10][5]' index buf[1000][0] out of bounds.\n", errout.str());
}
void executionPaths2() {
check("void foo()\n"
"{\n"
" char a[64];\n"
" int sz = sizeof(a);\n"
" bar(&sz);\n"
" a[sz] = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void executionPaths3() {
check("void f(char *VLtext)\n"
"{\n"
" if ( x ) {\n"
" return VLtext[0];\n"
" } else {\n"
" int wordlen = ab();\n"
" VLtext[wordlen] = 0;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void executionPaths5() {
// No false positive
check("class A {\n"
" void foo() {\n"
" int j = g();\n"
" arr[j]=0;\n"
" }\n"
"\n"
" int arr[2*BSize + 2];\n"
"};");
ASSERT_EQUALS("", errout.str());
}
void executionPaths6() { // handling unknown type
const char code[] = "void f() {\n"
" u32 a[10];"
" u32 i = 0;\n"
" if (x) { i = 1000; }\n"
" a[i] = 0;\n"
"}";
check(code);
ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[10]' accessed at index 1000, which is out of bounds.\n", errout.str());
}
void cmdLineArgs1() {
check("int main(int argc, char* argv[])\n"
"{\n"
" char prog[10];\n"
" strcpy(prog, argv[0]);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer overrun possible for long command line arguments.\n", errout.str());
check("int main(int argc, char* argv[])\n"
"{\n"
" char prog[10] = {'\\0'};\n"
" strcat(prog, argv[0]);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer overrun possible for long command line arguments.\n", errout.str());
check("int main(int argc, char **argv, char **envp)\n"
"{\n"
" char prog[10];\n"
" strcpy(prog, argv[0]);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer overrun possible for long command line arguments.\n", errout.str());
check("int main(int argc, char **argv, char **envp)\n"
"{\n"
" char prog[10] = {'\\0'};\n"
" strcat(prog, argv[0]);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer overrun possible for long command line arguments.\n", errout.str());
check("int main(int argc, char **options)\n"
"{\n"
" char prog[10];\n"
" strcpy(prog, options[0]);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer overrun possible for long command line arguments.\n", errout.str());
check("int main(int argc, char **options)\n"
"{\n"
" char prog[10] = {'\\0'};\n"
" strcat(prog, options[0]);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer overrun possible for long command line arguments.\n", errout.str());
check("int main(int argc, char **options)\n"
"{\n"
" char prog[10];\n"
" strcpy(prog, *options);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer overrun possible for long command line arguments.\n", errout.str());
check("int main(int argc, char **options)\n"
"{\n"
" char prog[10];\n"
" strcpy(prog+3, *options);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer overrun possible for long command line arguments.\n", errout.str());
check("int main(int argc, char **argv, char **envp)\n"
"{\n"
" char prog[10];\n"
" if (strlen(argv[0]) < 10)\n"
" strcpy(prog, argv[0]);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int main(int argc, char **argv, char **envp)\n"
"{\n"
" char prog[10] = {'\\0'};\n"
" if (10 > strlen(argv[0]))\n"
" strcat(prog, argv[0]);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int main(int argc, char **argv, char **envp)\n"
"{\n"
" char prog[10];\n"
" argv[0][0] = '\\0';\n"
" strcpy(prog, argv[0]);\n"
"}");
ASSERT_EQUALS("", errout.str());
// #5835
check("int main(int argc, char* argv[]) {\n"
" char prog[10];\n"
" strcpy(prog, argv[0]);\n"
" strcpy(prog, argv[0]);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer overrun possible for long command line arguments.\n"
"[test.cpp:4]: (error) Buffer overrun possible for long command line arguments.\n", errout.str());
// #7964
check("int main(int argc, char *argv[]) {\n"
" char *strcpy();\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int main(int argc, char *argv[]) {\n"
" char *strcat();\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void checkBufferAllocatedWithStrlen() {
check("void f(char *a) {\n"
" char *b = new char[strlen(a)];\n"
" strcpy(b, a);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer is accessed out of bounds.\n", errout.str());
check("void f(char *a) {\n"
" char *b = new char[strlen(a) + 1];\n"
" strcpy(b, a);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(char *a) {\n"
" char *b = new char[strlen(a)];\n"
" a[0] = '\\0';\n"
" strcpy(b, a);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(char *a) {\n"
" char *b = malloc(strlen(a));\n"
" b = realloc(b, 10000);\n"
" strcpy(b, a);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(char *a) {\n"
" char *b = malloc(strlen(a));\n"
" strcpy(b, a);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer is accessed out of bounds.\n", errout.str());
check("void f(char *a) {\n"
" char *b = malloc(strlen(a));\n"
" {\n"
" strcpy(b, a);\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer is accessed out of bounds.\n", errout.str());
check("void f(char *a) {\n"
" char *b = malloc(strlen(a) + 1);\n"
" strcpy(b, a);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(char *a, char *c) {\n"
" char *b = realloc(c, strlen(a));\n"
" strcpy(b, a);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer is accessed out of bounds.\n", errout.str());
check("void f(char *a, char *c) {\n"
" char *b = realloc(c, strlen(a) + 1);\n"
" strcpy(b, a);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(char *a) {\n"
" char *b = malloc(strlen(a));\n"
" strcpy(b, a);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer is accessed out of bounds.\n", errout.str());
}
void scope() {
check("class A {\n"
"private:\n"
" struct X { char buf[10]; };\n"
"}\n"
"\n"
"void f()\n"
"{\n"
" X x;\n"
" x.buf[10] = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("class A {\n"
"public:\n"
" struct X { char buf[10]; };\n"
"}\n"
"\n"
"void f()\n"
"{\n"
" A::X x;\n"
" x.buf[10] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:9]: (error) Array 'x.buf[10]' accessed at index 10, which is out of bounds.\n", errout.str());
}
void getErrorMessages() {
// Ticket #2292: segmentation fault when using --errorlist
CheckBufferOverrun c;
c.getErrorMessages(this, 0);
}
void arrayIndexThenCheck() {
check("void f(const char s[]) {\n"
" if (s[i] == 'x' && i < y) {\n"
" }"
"}");
ASSERT_EQUALS("", errout.str()); // No message because i is unknown and thus gets no varid. Avoid an internalError here.
check("void f(const char s[], int i) {\n"
" if (s[i] == 'x' && i < y) {\n"
" }"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Array index 'i' is used before limits check.\n", errout.str());
check("void f(const char s[]) {\n"
" for (int i = 0; s[i] == 'x' && i < y; ++i) {\n"
" }"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Array index 'i' is used before limits check.\n", errout.str());
check("void f(const int a[], unsigned i) {\n"
" if((a[i] < 2) && (i <= 42)) {\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Array index 'i' is used before limits check.\n", errout.str());
check("void f(const int a[], unsigned i) {\n"
" if((a[i] < 2) && (42 >= i)) {\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Array index 'i' is used before limits check.\n", errout.str());
check("void f(char* e, int y) {\n"
" if (e[y] == '/' && elen > y + 1 && e[y + 1] == '?') {\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(const int a[], unsigned i) {\n"
" if(a[i] < func(i) && i <= 42) {\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Array index 'i' is used before limits check.\n", errout.str());
check("void f(const int a[], unsigned i) {\n"
" if (i <= 42 && a[i] < func(i)) {\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(const int a[], unsigned i) {\n"
" if (foo(a[i] + 3) < func(i) && i <= 42) {\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Array index 'i' is used before limits check.\n", errout.str());
check("void f(int i) {\n" // sizeof
" sizeof(a)/sizeof(a[i]) && i < 10;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void bufferNotZeroTerminated() {
check("void f() {\n"
" char c[6];\n"
" strncpy(c,\"hello!\",6);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning, inconclusive) The buffer 'c' is not null-terminated after the call to strncpy().\n", errout.str());
check("void f() {\n"
" char c[6];\n"
" memcpy(c,\"hello!\",6);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning, inconclusive) The buffer 'c' is not null-terminated after the call to memcpy().\n", errout.str());
check("void f() {\n"
" char c[6];\n"
" memmove(c,\"hello!\",6);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning, inconclusive) The buffer 'c' is not null-terminated after the call to memmove().\n", errout.str());
}
void negativeMemoryAllocationSizeError() { // #389
check("void f()\n"
"{\n"
" int *a;\n"
" a = new int[-1];\n"
" delete [] a;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Memory allocation size is negative.\n", errout.str());
check("void f()\n"
"{\n"
" int *a;\n"
" a = malloc( -10 );\n"
" free(a);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Memory allocation size is negative.\n", errout.str());
check("void f()\n"
"{\n"
" int *a;\n"
" a = malloc( -10);\n"
" free(a);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Memory allocation size is negative.\n", errout.str());
check("void f()\n"
"{\n"
" int *a;\n"
" a = alloca( -10 );\n"
" free(a);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Memory allocation size is negative.\n", errout.str());
}
void negativeArraySize() {
check("void f(int sz) {\n" // #1760 - VLA
" int a[sz];\n"
"}\n"
"void x() { f(-100); }");
ASSERT_EQUALS("[test.cpp:2]: (error) Declaration of array 'a' with negative size is undefined behaviour\n", errout.str());
// don't warn for constant sizes -> this is a compiler error so this is used for static assertions for instance
check("int x, y;\n"
"int a[-1];\n"
"int b[x?1:-1];\n"
"int c[x?y:-1];\n");
ASSERT_EQUALS("", errout.str());
}
};
REGISTER_TEST(TestBufferOverrun)
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