/* * Cppcheck - A tool for static C/C++ code analysis * Copyright (C) 2007-2013 Daniel Marjamäki and 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 . */ #include "tokenize.h" #include "checkbufferoverrun.h" #include "testsuite.h" #include #include extern std::ostringstream errout; class TestBufferOverrun : public TestFixture { public: TestBufferOverrun() : TestFixture("TestBufferOverrun") { } private: void check(const char code[], bool experimental = true, const char filename[] = "test.cpp", bool verify = true) { // Clear the error buffer.. errout.str(""); Settings settings; settings.inconclusive = true; settings.standards.posix = true; settings.experimental = experimental; settings.addEnabled("warning"); settings.addEnabled("style"); settings.addEnabled("portability"); // Tokenize.. Tokenizer tokenizer(&settings, this); std::istringstream istr(code); tokenizer.tokenize(istr, filename); const std::string str1(tokenizer.tokens()->stringifyList(0,true)); // Assign variable ids tokenizer.simplifyTokenList2(); const std::string str2(tokenizer.tokens()->stringifyList(0,true)); // Ensure that the test case is not bad. if (verify && str1 != str2) { warn(("Unsimplified code in test case. It looks like this test " "should either be cleaned up or moved to TestTokenizer or " "TestSimplifyTokens instead.\nstr1="+str1+"\nstr2="+str2).c_str()); } // Check for buffer overruns.. CheckBufferOverrun checkBufferOverrun(&tokenizer, &settings, this); checkBufferOverrun.bufferOverrun(); checkBufferOverrun.negativeIndex(); checkBufferOverrun.arrayIndexThenCheck(); checkBufferOverrun.writeOutsideBufferSize(); } void run() { 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_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_break); // FP: for,break 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(buffer_overrun_1_standard_functions); 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_12); TEST_CASE(buffer_overrun_13); TEST_CASE(buffer_overrun_14); TEST_CASE(buffer_overrun_15); // ticket #1787 TEST_CASE(buffer_overrun_16); TEST_CASE(buffer_overrun_17); // ticket #2548 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_20); // #2986 (segmentation fault) TEST_CASE(buffer_overrun_21); TEST_CASE(buffer_overrun_22); // #3124 TEST_CASE(buffer_overrun_23); // #3153 TEST_CASE(buffer_overrun_24); // #4106 TEST_CASE(buffer_overrun_25); // #4096 TEST_CASE(buffer_overrun_26); // #4432 (segmentation fault) TEST_CASE(buffer_overrun_27); // #4444 (segmentation fault) TEST_CASE(buffer_overrun_bailoutIfSwitch); // ticket #2378 : bailoutIfSwitch TEST_CASE(buffer_overrun_function_array_argument); TEST_CASE(possible_buffer_overrun_1); // #3035 // 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(sprintf1); TEST_CASE(sprintf2); TEST_CASE(sprintf3); TEST_CASE(sprintf4); TEST_CASE(sprintf5); TEST_CASE(sprintf6); TEST_CASE(sprintf7); TEST_CASE(sprintf8); TEST_CASE(sprintf9); TEST_CASE(sprintf10); TEST_CASE(snprintf1); TEST_CASE(snprintf2); TEST_CASE(snprintf4); TEST_CASE(snprintf5); TEST_CASE(snprintf6); TEST_CASE(snprintf7); TEST_CASE(strncat1); TEST_CASE(strncat2); TEST_CASE(strncat3); TEST_CASE(strncat4); TEST_CASE(strcat1); TEST_CASE(strcat2); TEST_CASE(strcat3); TEST_CASE(memfunc1); // memchr/memset/memcpy TEST_CASE(memfunc2); TEST_CASE(memfunc3); // ticket #1659 TEST_CASE(varid1); TEST_CASE(varid2); TEST_CASE(varid3); // ticket #4764 TEST_CASE(assign1); TEST_CASE(alloc1); // Buffer allocated with new TEST_CASE(alloc2); // Buffer allocated with malloc TEST_CASE(alloc3); // statically allocated buffer TEST_CASE(alloc4); // Buffer allocated with alloca TEST_CASE(malloc_memset); // using memset on buffer allocated with malloc TEST_CASE(memset1); TEST_CASE(memset2); TEST_CASE(counter_test); TEST_CASE(strncpy1); 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 #2607 - crash TEST_CASE(crash3); // Ticket #3034 - crash TEST_CASE(garbage1); // Ticket #5203 TEST_CASE(executionPaths1); TEST_CASE(executionPaths2); TEST_CASE(executionPaths3); // no FP for function parameter TEST_CASE(executionPaths4); // Ticket #2386 - Segmentation fault in the ExecutionPath handling TEST_CASE(executionPaths5); // Ticket #2920 - False positive when size is unknown TEST_CASE(executionPaths6); // unknown types TEST_CASE(cmdLineArgs1); TEST_CASE(scope); // handling different scopes TEST_CASE(getErrorMessages); TEST_CASE(unknownMacroNoDecl); // #2638 - not variable declaration: 'AAA a[0] = 0;' // Access array and then check if the used index is within bounds TEST_CASE(arrayIndexThenCheck); TEST_CASE(bufferNotZeroTerminated); TEST_CASE(readlink); TEST_CASE(readlinkat); TEST_CASE(writeOutsideBufferSize) } 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 f()\n" "{\n" " char *str = new char[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()); } 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) Buffer is accessed out of bounds: val\n" "[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) Buffer is accessed out of bounds: val\n" "[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) Buffer is accessed out of bounds: val\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" " {\n" " }\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) Buffer is accessed out of bounds: a\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", 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) Buffer is accessed out of bounds: f.str\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()); } 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", 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()); // #3168 check("void a(char *p) { memset(p,0,100); }\n" "void b() {\n" " char buf[10];\n" " a(buf);" "}"); ASSERT_EQUALS("[test.cpp:4] -> [test.cpp:1]: (error) Buffer is accessed out of bounds: buf\n", 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", 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) Buffer is accessed out of bounds: a\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:4]: (error) Array 'a["+charMaxPlusOne.str()+"]' accessed at index "+charMaxPlusOne.str()+", which is out of bounds.\n" "[test.cpp:3]: (error) Array index -1 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:4]: (error) Array 'a[128]' accessed at index 128, which is out of bounds.\n" "[test.cpp:3]: (error) Array index -1 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:4]: (error) Array 'a[256]' accessed at index 256, which is out of bounds.\n" "[test.cpp:3]: (error) Array index -1 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:4]: (error) Array 'a[32768]' accessed at index 32768, which is out of bounds.\n" "[test.cpp:3]: (error) Array index -1 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:4]: (error) Array 'a[65536]' accessed at index 65536, which is out of bounds.\n" "[test.cpp:3]: (error) Array index -1 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:4]: (error) Array 'a[32768]' accessed at index 32768, which is out of bounds.\n" "[test.cpp:3]: (error) Array index -1 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() { // ticket #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) Buffer is accessed out of bounds: a\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 'a[10]' accessed at index -1, which 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:14]: (error) Array 'ptest.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: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", 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.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.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\n\", 3-i, buffer[3-i]);\n" " }\n" "}"); 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) Buffer is accessed out of bounds: buffer\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_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()); // 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()); } 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 > &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" "[test.cpp:4]: (error) Array index -1 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) Buffer is accessed out of bounds: data\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" "}"); TODO_ASSERT_EQUALS("[test.cpp:5]: (error) Array 'val[5]' index -1 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) Buffer is accessed out of bounds: data\n" "[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) Buffer is accessed out of bounds: data\n" "[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) Buffer is accessed out of bounds: data\n" "[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) Buffer is accessed out of bounds: data\n", errout.str()); } void array_index_for_break() { check("void f() {\n" " int a[2];\n" " for (int i = 0; i <= 2; ++i) {\n" " a[i] = 0;\n" " if (i==1) {\n" " break;\n" " }\n" " }\n" "}"); ASSERT_EQUALS("", 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" "}"); 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" "}"); TODO_ASSERT_EQUALS("[test.cpp:7]: (error) Array 'a[2]' accessed at index -1, which is out of bounds", "", 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) Buffer is accessed out of bounds: a\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) Buffer is accessed out of bounds: a\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) Buffer is accessed out of bounds: a\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" "}"); ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[10]' accessed at index -1, which 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 'a[10]' accessed at index -1, which 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()); } 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", 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) Array 'str[3]' accessed at index 10, which is out of bounds. Otherwise condition 'i==10' is redundant.\n", errout.str()); check("void f() {\n" " char str[3];\n" " str[((unsigned char)3) - 1] = 0;\n" "}", false, "test.cpp", false); ASSERT_EQUALS("", errout.str()); check("void f() {\n" // #5416 FP " char *str[3];\n" " do_something(&str[0][5]);\n" "}", false, "test.cpp", false); ASSERT_EQUALS("", errout.str()); } void buffer_overrun_1_standard_functions() { check("void f()\n" "{\n" " char str[3];\n" " strcpy(str, \"abc\");\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (error) Buffer is accessed out of bounds: str\n", errout.str()); check("void f(int fd)\n" "{\n" " char str[3];\n" " read(fd, str, 3);\n" "}"); ASSERT_EQUALS("", errout.str()); check("void f(int fd)\n" "{\n" " char str[3];\n" " read(fd, str, 4);\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (error) Buffer is accessed out of bounds: str\n", errout.str()); check("void f(int fd)\n" "{\n" " char str[3];\n" " write(fd, str, 3);\n" "}"); ASSERT_EQUALS("", errout.str()); check("void f(int fd)\n" "{\n" " char str[3];\n" " write(fd, str, 4);\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (error) Buffer is accessed out of bounds: str\n", errout.str()); check("void f()\n" "{\n" " long bb[2];\n" " write(stdin, bb, sizeof(bb));\n" "}", false, "test.cpp", false); ASSERT_EQUALS("", errout.str()); check("void f()\n" "{\n" " char str[3];\n" " fgets(str, 3, stdin);\n" "}"); ASSERT_EQUALS("", errout.str()); check("void f()\n" "{\n" " char str[3];\n" " fgets(str, 4, stdin);\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (error) Buffer is accessed out of bounds: str\n", errout.str()); // fread check("void f(FILE* fd)\n" "{\n" "char str[3];\n" "fread(str,1,4,fd);\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (error) Buffer is accessed out of bounds: str\n", errout.str()); check("void f(FILE* fd)\n" "{\n" "char str[3];\n" "fread(str,1,3,fd);\n" "}"); ASSERT_EQUALS("", errout.str()); // fwrite check("void f(FILE* fd)\n" "{\n" "char str[3];\n" "fwrite(str,1,4,fd);\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (error) Buffer is accessed out of bounds: str\n", errout.str()); check("void f(FILE* fd)\n" "{\n" "char str[3];\n" "fwrite(str,1,3,fd);\n" "}"); ASSERT_EQUALS("", errout.str()); check("void f()\n" "{\n" "char str[3];\n" "recv(s, str, 4, 0);\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (error) Buffer is accessed out of bounds: str\n", errout.str()); check("void f()\n" "{\n" "char str[3];\n" "recvfrom(s, str, 4, 0, 0x0, 0x0);\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (error) Buffer is accessed out of bounds: str\n", errout.str()); check("void f()\n" "{\n" "char str[3];\n" "send(s, str, 4, 0);\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (error) Buffer is accessed out of bounds: str\n", errout.str()); check("void f()\n" "{\n" "char str[3];\n" "sendto(s, str, 4, 0, 0x0, 0x0);\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (error) Buffer is accessed out of bounds: str\n", errout.str()); // #4968 - not standard function check("void f() {\n" " char str[3];\n" " foo.memset(str, 0, 100);\n" " foo::memset(str, 0, 100);\n" " std::memset(str, 0, 100);\n" "}"); ASSERT_EQUALS("[test.cpp:5]: (error) Buffer is accessed out of bounds: str\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) Buffer is accessed out of bounds: a\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) Buffer is accessed out of bounds: p\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_12() { // ticket #900 check("void f() {\n" " char *a = new char(30);\n" " sprintf(a, \"%s\", \"b\");\n" " delete a;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Buffer is accessed out of bounds.\n", errout.str()); } void buffer_overrun_13() { // ticket #836 check("void f() {\n" " char a[10];\n" " memset(a+5, 0, 10);\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Buffer is accessed out of bounds: a\n", errout.str()); check("void f() {\n" " char a[10];\n" " memmove(a, a+5, 10);\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Buffer is accessed out of bounds: a\n", errout.str()); } void buffer_overrun_14() { check("void f(char *a) {\n" " char *b = new char[strlen(a)];\n" " strcpy(b, a);\n" " return b;\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" " return b;\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" " return b;\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" " return b;\n" "}"); ASSERT_EQUALS("", errout.str()); check("void f(char *a) {\n" " char *b = malloc(strlen(a));\n" " strcpy(b, a);\n" " return b;\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" " return b;\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" " return b;\n" "}"); ASSERT_EQUALS("", errout.str()); check("void f(char *a, char *c) {\n" " char *b = realloc(c, strlen(a));\n" " strcpy(b, a);\n" " return b;\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" " return b;\n" "}"); ASSERT_EQUALS("", errout.str()); check("void f(char *a) {\n" " char *b = malloc(strlen(a));\n" " sprintf(b, \"%s\", a);\n" " return b;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Buffer is accessed out of bounds.\n", errout.str()); } void buffer_overrun_15() { // ticket #1787 check("class A : public B {\n" " char val[12];\n" " void f(int i, int ii);\n" "};\n" "void A::f(int i, int ii)\n" "{\n" " sprintf(val, \"drive_%d_partition_%d_size\", i, ii) ;\n" "}"); ASSERT_EQUALS("[test.cpp:7]: (error) Buffer is accessed out of bounds.\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_17() { // ticket #2548 check("void f() {\n" " char t[8];\n" " sprintf(t, \"%s\", \"foo bar\");\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Buffer is accessed out of bounds.\n", 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_20() { // #2986(segmentation fault) check("x[y]\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) Buffer is accessed out of bounds: dst\n" "[test.cpp:6]: (error) Array 'dst[4]' accessed at index 4, which is out of bounds.\n", errout.str()); } void buffer_overrun_22() { // ticket #3124 check("class A {\n" "public:\n" " char b[5][6];\n" "};\n" "int main() {\n" " A a;\n" " memset(a.b, 0, 5 * 6);\n" "}"); ASSERT_EQUALS("", errout.str()); check("class A {\n" "public:\n" " char b[5][6];\n" "};\n" "int main() {\n" " A a;\n" " memset(a.b, 0, 6 * 6);\n" "}"); ASSERT_EQUALS("[test.cpp:7]: (error) Buffer is accessed out of bounds: a.b\n", errout.str()); } void buffer_overrun_23() { // ticket #3153 check("void foo() {\n" " double dest = 23.0;\n" " char* const source = (char*) malloc(sizeof(dest));\n" " memcpy(&dest, source + sizeof(double), sizeof(dest));\n" "}", false, "test.cpp", false); ASSERT_EQUALS("[test.cpp:4]: (error) Buffer is accessed out of bounds.\n", errout.str()); check("void foo() {\n" " double dest = 23.0;\n" " char* const source = (char*) malloc(2 * sizeof(dest));\n" " memcpy(&dest, source + sizeof(double), sizeof(dest));\n" "}", false, "test.cpp", false); ASSERT_EQUALS("", errout.str()); } void buffer_overrun_24() { // 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" "}"); ASSERT_EQUALS("[test.cpp:5]: (error) Buffer is accessed out of bounds: array\n", errout.str()); check("void main() {\n" " int array[] = {1,2};\n" " for( int i = 0; i<6; ) {\n" " i++; }\n" "}"); ASSERT_EQUALS("", errout.str()); } void buffer_overrun_25() { // 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" "}"); ASSERT_EQUALS("[test.cpp:5]: (error) Buffer is accessed out of bounds: array\n", 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_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()); } 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 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 result does not point into or just past the end of the array.\n", 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 result does not point into or just past the end of the buffer.\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 sprintf1() { check("void f()\n" "{\n" " char str[3];\n" " sprintf(str, \"%s\", \"abc\");\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (error) Buffer is accessed out of bounds.\n", errout.str()); check("void f()\n" "{\n" " char * c = new char[10];\n" " sprintf(c, \"%s\", \"/usr/LongLongLongLongUserName/bin/LongLongApplicationName\");\n" " delete [] c;\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (error) Buffer is accessed out of bounds.\n", errout.str()); } void sprintf2() { check("int getnumber();\n" "void f()\n" "{\n" " char str[5];\n" " sprintf(str, \"%d: %s\", getnumber(), \"abcde\");\n" "}"); ASSERT_EQUALS("[test.cpp:5]: (error) Buffer is accessed out of bounds.\n", errout.str()); } void sprintf3() { check("void f()\n" "{\n" " char str[3];\n" " sprintf(str, \"test\");\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (error) Buffer is accessed out of bounds.\n", errout.str()); check("void f()\n" "{\n" " char str[5];\n" " sprintf(str, \"test%s\", \"\");\n" "}"); ASSERT_EQUALS("", errout.str()); } void sprintf4() { // ticket #690 check("void f()\n" "{\n" " char a[3];\n" " sprintf(a, \"%02ld\", 99);\n" "}"); ASSERT_EQUALS("", errout.str()); } void sprintf5() { // ticket #729 check("void f(int condition)\n" "{\n" " char buf[3];\n" " sprintf(buf, \"%s\", condition ? \"11\" : \"22\");\n" "}"); ASSERT_EQUALS("", errout.str()); } void sprintf6() { check("void f(int condition)\n" "{\n" " char buf[3];\n" " sprintf(buf, \"%s\", condition ? \"11\" : \"222\");\n" "}"); TODO_ASSERT_EQUALS("[test.cpp:4]: (error) Buffer is accessed out of bounds.\n", "", errout.str()); } void sprintf7() { check("struct Foo { char a[1]; };\n" "void f()\n" "{\n" " struct Foo x;\n" " sprintf(x.a, \"aa\");\n" "}"); ASSERT_EQUALS("[test.cpp:5]: (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" "{\n" " struct Foo *x = malloc(sizeof(Foo));\n" " sprintf(x.a, \"aa\");\n" " free(x);\n" "}"); TODO_ASSERT_EQUALS("error", "", errout.str()); check("struct Foo { char a[1]; };\n" "void f()\n" "{\n" " struct Foo *x = malloc(sizeof(Foo) + 10);\n" " sprintf(x.a, \"aa\");\n" " free(x);\n" "}"); ASSERT_EQUALS("", errout.str()); } void sprintf8() { check("struct Foo { char a[3]; };\n" "void f()\n" "{\n" " struct Foo x;\n" " sprintf(x.a, \"aa\");\n" "}"); ASSERT_EQUALS("", errout.str()); } void sprintf9() { check("void f()\n" "{\n" " gchar str[3];\n" " sprintf(str, \"1\");\n" "}"); ASSERT_EQUALS("", errout.str()); } void sprintf10() { check("void f()\n" "{\n" " TString str = \"\";\n" " sprintf(str, \"1\");\n" "}"); ASSERT_EQUALS("", errout.str()); } void snprintf1() { check("void f()\n" "{\n" " char str[5];\n" " snprintf(str, 10, \"%s\", \"abc\");\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (error) snprintf size is out of bounds: Supplied size 10 is larger than actual size 5.\n", errout.str()); } void snprintf2() { check("void f()\n" "{\n" " char str[5];\n" " snprintf(str, 5, \"%s\", \"abc\");\n" "}"); ASSERT_EQUALS("", errout.str()); } void snprintf4() { check("void f(int x)\n" "{\n" " char str[5];\n" " snprintf(str, 8 - x, \"abcdefghijkl\");\n" "}"); ASSERT_EQUALS("", errout.str()); } void snprintf5() { check("struct Foo { char a[1]; };\n" "void f()\n" "{\n" " struct Foo x;\n" " snprintf(x.a, 2, \"aa\");\n" "}"); ASSERT_EQUALS("[test.cpp:5]: (error) snprintf size is out of bounds: Supplied size 2 is larger than actual size 1.\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" "{\n" " struct Foo *x = malloc(sizeof(Foo));\n" " snprintf(x.a, 2, \"aa\");\n" " free(x);\n" "}"); TODO_ASSERT_EQUALS("error", "", errout.str()); check("struct Foo { char a[1]; };\n" "void f()\n" "{\n" " struct Foo *x = malloc(sizeof(Foo) + 10);\n" " snprintf(x.a, 2, \"aa\");\n" " free(x);\n" "}"); ASSERT_EQUALS("", errout.str()); } void snprintf6() { check("struct Foo { char a[3]; };\n" "void f()\n" "{\n" " struct Foo x;\n" " snprintf(x.a, 2, \"aa\");\n" "}"); ASSERT_EQUALS("", errout.str()); } void snprintf7() { check("void x() {\n" " sal_Char pString[1024];\n" " snprintf(pString, 1024, \"ab\");\n" "}"); ASSERT_EQUALS("", errout.str()); } void strncat1() { check("void f(char *a, char *b)\n" "{\n" " char str[16];\n" " strncpy(str, a, 10);\n" " strncat(str, b, 10);\n" "}"); ASSERT_EQUALS("[test.cpp:5]: (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" "{\n" " char str[5];\n" " strncat(str, a, 5);\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 strncat3() { check("struct Foo { char a[4]; };\n" "void f(char *a)\n" "{\n" " struct Foo x;\n" " strncat(x.a, a, 5);\n" "}"); ASSERT_EQUALS("[test.cpp:5]: (error) Buffer is accessed out of bounds: x.a\n", errout.str()); } void strncat4() { 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" "{\n" " struct Foo x;\n" " strcat(x.a, \"aa\");\n" " strcat(x.a, \"aa\");\n" "}"); ASSERT_EQUALS("[test.cpp:6]: (error) Buffer is accessed out of bounds.\n", errout.str()); } void strcat2() { check("struct Foo { char a[5]; };\n" "void f()\n" "{\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()); } // memchr/memset/memcpy/etc void memfunc1() { check("struct S {\n" " char a[5];\n" "};\n" "void f()\n" "{\n" " S s;\n" " memset(s.a, 0, 10);\n" "}"); ASSERT_EQUALS("[test.cpp:7]: (error) Buffer is accessed out of bounds: s.a\n", errout.str()); check("void f()\n" "{\n" " char str[5];\n" " memset(str, 0, 10);\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (error) Buffer is accessed out of bounds: str\n", errout.str()); check("void f()\n" "{\n" " char a[5], b[50];\n" " memcpy(a, b, 10);\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (error) Buffer is accessed out of bounds: a\n", errout.str()); check("void f()\n" "{\n" " char a[5], b[50];\n" " memmove(a, b, 10);\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (error) Buffer is accessed out of bounds: a\n", errout.str()); // Ticket #909 check("void f()\n" "{\n" " char * pch;\n" " char str[] = \"Example string\";\n" " pch = memchr (str, 'p', 16);\n" "}"); ASSERT_EQUALS("[test.cpp:5]: (error) Buffer is accessed out of bounds: str\n", errout.str()); } // ticket #2121 - buffer access out of bounds when using uint32_t void memfunc2() { check("void f()\n" "{\n" " unknown_type_t buf[4];\n" " memset(buf, 0, 100);\n" "}"); ASSERT_EQUALS("", errout.str()); } // ticket #1659 - overflowing variable when using memcpy void memfunc3() { check("void f() { \n" "char str1[]=\"Sample string\";\n" "char str2;\n" "memcpy (&str2,str1,13);\n" // <-- strlen(str1)+1 = 13 "}"); TODO_ASSERT_EQUALS("[test.cpp:4]: (error) Buffer is accessed out of bounds: str1\n","", errout.str()); check("void f() {\n" " char a[10];\n" " char str1[] = \"abcdef\";\n" " memset(a, 0, 11);\n" // <-- strlen(str1) + 5 = 11 "}"); ASSERT_EQUALS("[test.cpp:4]: (error) Buffer is accessed out of bounds: a\n", errout.str()); check("void f() { \n" "char str1[]=\"Sample string\";\n" "char str2;\n" "memcpy (&str2,str1,15);\n" // <-- strlen(str1) + 1 = 15 "}"); ASSERT_EQUALS("[test.cpp:4]: (error) Buffer is accessed out of bounds: str1\n", 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() { check("void foo()\n" "{\n" " char str[10];\n" " if (str[0])\n" " {\n" " char str[50];\n" " memset(str,0,50);\n" " }\n" "}"); ASSERT_EQUALS("", errout.str()); } void varid3() { // #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 alloc1() { 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", errout.str()); check("void foo()\n" "{\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" "{\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:7]: (error) Array 'buf[9]' accessed at index 9, 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" "}", false, "test.cpp", false); 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" "}", false, "test.cpp", false); ASSERT_EQUALS("", errout.str()); } // data is allocated with malloc void alloc2() { 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" "}", false, "test.cpp", false); ASSERT_EQUALS("[test.cpp:3]: (error) Array 'tab4[20]' accessed at index 20, 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" "}", false, "test.cpp", false); ASSERT_EQUALS("[test.cpp:4]: (error) Array 'x[10]' accessed at index 10, which is out of bounds.\n", errout.str()); } // statically allocated buffer void alloc3() { 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 alloc4() { 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 malloc_memset() { check("void f() {\n" " char *p = malloc(10);\n" " memset(p,0,100);\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Buffer is accessed out of bounds.\n", errout.str()); } void memset1() { check("void foo()\n" "{\n" " char s[10];\n" " memset(s, 5, '*');\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (warning) The size argument is given as a char constant.\n", errout.str()); check("void foo()\n" "{\n" " int* x[5];\n" " memset(x, 0, sizeof(x));\n" "}",false,"test.cpp",false); ASSERT_EQUALS("", errout.str()); } void memset2() { check("class X {\n" " char* array[2];\n" " X();\n" "};\n" "X::X() {\n" " memset(array, 0, sizeof(array));\n" "}",false,"test.cpp",false); ASSERT_EQUALS("", errout.str()); } void counter_test() const { std::list 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); strTok.str("\"12345\""); std::list stringAsParameter; stringAsParameter.push_back(&strTok); 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 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 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 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 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 strncpy1() { check("void f() {\n" " char c[7];\n" " strncpy(c, \"hello\", 7);\n" "}"); ASSERT_EQUALS("", errout.str()); check("void f() {\n" " char c[6];\n" " strncpy(c,\"hello\",6);\n" "}"); ASSERT_EQUALS("", errout.str()); check("void f() {\n" " char c[5];\n" " strncpy(c,\"hello\",6);\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Buffer is accessed out of bounds: c\n", errout.str()); check("void f() {\n" " char c[6];\n" " strncpy(c,\"hello!\",7);\n" "}"); 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" "{\n" " strncpy(x, ab->a, 100);\n" "}"); ASSERT_EQUALS("", 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()); // 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("struct C {} {} x"); } void crash3() { check("void a(char *p) {\n" " f( { if(finally_arg); } );\n" "}\n" "\n" "void b() {\n" " char arr[64];\n" " a(arr);\n" "}"); } void garbage1() { // Ticket #5203 check("int f ( int* r ) { { int s[2] ; f ( s ) ; if ( ) } }"); } void epcheck(const char code[], const char filename[] = "test.cpp") { // Clear the error buffer.. errout.str(""); Settings settings; // Tokenize.. Tokenizer tokenizer(&settings, this); std::istringstream istr(code); tokenizer.tokenize(istr, filename); tokenizer.simplifyTokenList2(); // Check for buffer overruns.. CheckBufferOverrun checkBufferOverrun(&tokenizer, &settings, this); checkBufferOverrun.bufferOverrun(); } void executionPaths1() { epcheck("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()); epcheck("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() { epcheck("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() { epcheck("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 executionPaths4() { // Ticket #2386 - Segmentation fault upon strange syntax epcheck("void f() {\n" " switch ( x ) {\n" " case struct Tree : break;\n" " }\n" "}"); ASSERT_EQUALS("", errout.str()); } void executionPaths5() { // No false positive epcheck("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" "}"; epcheck(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[])\n" "{\n" " char prog[10];\n" " sprintf(prog, \"%s\", 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 **argv, char **envp)\n" "{\n" " char prog[10];\n" " sprintf(prog, \"%s\", 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" " sprintf(prog, \"%s\", *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" " sprintf(prog, \"%p\", 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()); } 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" "}"); TODO_ASSERT_EQUALS("[test.cpp:9]: (error) Array 'x.buf[10]' index 10 out of bounds.\n", "", errout.str()); } void getErrorMessages() { // Ticket #2292: segmentation fault when using --errorlist CheckBufferOverrun c; c.getErrorMessages(this, 0); } void unknownMacroNoDecl() { check("void f() {\n" " int a[10];\n" " AAA a[0] = 0;\n" // <- not a valid array declaration " a[1] = 1;\n" "}"); ASSERT_EQUALS("", errout.str()); } void arrayIndexThenCheck() { check("void f(const char s[]) {\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 (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()); // this one doesn't work for now, hopefully in the future check("void f(const int a[], unsigned i) {\n" " if(a[i] < func(i) && i <= 42) {\n" " }\n" "}"); TODO_ASSERT_EQUALS("[test.cpp:2]: (style) Array index 'i' is used before limits check.\n", "", 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 readlink() { check("void f() {\n" " char buf[255];\n" " ssize_t len = readlink(path, buf, 254);\n" " printf(\"%s\n\", buf);\n" "}"); TODO_ASSERT_EQUALS("[test.cpp:3]: (warning, inconclusive) The buffer 'buf' is not null-terminated after the call to readlink().\n", "", errout.str()); // C only: Primitive pointer simplification check("void f() {\n" " char buf[255];\n" " ssize_t len = readlink(path, &buf[0], 254);\n" " printf(\"%s\n\", buf);\n" "}\n", true, "test.c"); TODO_ASSERT_EQUALS("[test.c:3]: (warning, inconclusive) The buffer 'buf' is not null-terminated after the call to readlink().\n", "", errout.str()); check("void f() {\n" " char buf[255];\n" " ssize_t len = readlink(path, buf, 254);\n" " buf[len] = 0;\n" "}"); ASSERT_EQUALS("", errout.str()); check("void f() {\n" " char buf[10];\n" " ssize_t len = readlink(path, buf, 255);\n" " buf[len] = 0;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) readlink() buf size is out of bounds: Supplied size 255 is larger than actual size 10.\n", errout.str()); check("void f() {\n" " char buf[255];\n" " ssize_t len = readlink(path, buf, 255);\n" " buf[len] = 0;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (warning, inconclusive) readlink() might return the full size of 'buf'. Lower the supplied size by one.\n", errout.str()); check("void f() {\n" " char buf[255];\n" " ssize_t len = readlink(path, buf, 254);\n" " if (len == -1) {\n" " return;\n" " }\n" " buf[len] = 0;\n" "}"); ASSERT_EQUALS("", errout.str()); check("void f() {\n" " char buf[255] = {0};\n" " readlink(path, buf, 254);\n" // <- doesn't write whole buf " puts(buf);\n" "}"); ASSERT_EQUALS("", errout.str()); } void readlinkat() { check("void f() {\n" " char buf[255];\n" " ssize_t len = readlinkat(42, path, buf, 254);\n" " printf(\"%s\n\", buf);\n" "}"); TODO_ASSERT_EQUALS("[test.cpp:3]: (warning, inconclusive) The buffer 'buf' is not null-terminated after the call to readlinkat().\n", "", errout.str()); check("void f() {\n" " char buf[255];\n" " ssize_t len = readlinkat(42, path, buf, 254);\n" " buf[len] = 0;\n" "}"); ASSERT_EQUALS("", errout.str()); check("void f() {\n" " char buf[10];\n" " ssize_t len = readlinkat(42, path, buf, 255);\n" " buf[len] = 0;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) readlinkat() buf size is out of bounds: Supplied size 255 is larger than actual size 10.\n", errout.str()); check("void f() {\n" " char buf[255];\n" " ssize_t len = readlinkat(42, path, buf, 255);\n" " buf[len] = 0;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (warning, inconclusive) readlinkat() might return the full size of 'buf'. Lower the supplied size by one.\n", errout.str()); check("void f() {\n" " char buf[255];\n" " ssize_t len = readlinkat(42, path, buf, 254);\n" " if (len == -1) {\n" " return;\n" " }\n" " buf[len] = 0;\n" "}"); ASSERT_EQUALS("", errout.str()); } void writeOutsideBufferSize() { check("void f(void){\n" "write(1, \"Dump string \\n\", 100);\n" "}"); // ^ number of bytes too big ASSERT_EQUALS("[test.cpp:2]: (error) Writing 86 bytes outside buffer size.\n", errout.str()); check("void f(void){\n" "write(1, \"Dump string \\n\", 10);\n" "}"); ASSERT_EQUALS("", errout.str()); // #4706 avoid crashing when a struct member is used as first argument check("static struct {\n" " int i[2];\n" "} p;\n" "void foo()\n" "{\n" " write(p.i[1], \"\", 1);\n" "}"); ASSERT_EQUALS("", errout.str()); check("static struct {\n" " int i[2];\n" "} p;\n" "void foo()\n" "{\n" " write(p.i[1], \"\", 2);\n" "}"); ASSERT_EQUALS("[test.cpp:6]: (error) Writing 1 bytes outside buffer size.\n", errout.str()); // #4969 check("void foo()\n" "{\n" " write(1, \"\\0\", 1);\n" "}"); ASSERT_EQUALS("", errout.str()); // that is documented to be ok check("void foo()\n" "{\n" " write(1, 0, 0);\n" "}"); ASSERT_EQUALS("", errout.str()); // ... that is not ok check("void foo()\n" "{\n" " write(1, 0, 1);\n" "}"); TODO_ASSERT_EQUALS("[test.cpp:3]: (error) Writing 1 bytes outside buffer size.\n", "", errout.str()); } }; REGISTER_TEST(TestBufferOverrun)