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cppcheck/test/testleakautovar.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2023 Cppcheck team.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "checkleakautovar.h"
#include "errortypes.h"
#include "helpers.h"
#include "settings.h"
#include "fixture.h"
#include "tokenize.h"
#include <sstream> // IWYU pragma: keep
#include <string>
#include <vector>
class TestLeakAutoVarStrcpy;
class TestLeakAutoVarWindows;
class TestLeakAutoVar : public TestFixture {
public:
TestLeakAutoVar() : TestFixture("TestLeakAutoVar") {}
private:
Settings settings;
void run() override {
constexpr char xmldata[] = "<?xml version=\"1.0\"?>\n"
"<def>\n"
" <podtype name=\"uint8_t\" sign=\"u\" size=\"1\"/>\n"
" <memory>\n"
" <alloc>malloc</alloc>\n"
" <realloc>realloc</realloc>\n"
" <dealloc>free</dealloc>\n"
" </memory>\n"
" <resource>\n"
" <alloc>socket</alloc>\n"
" <dealloc>close</dealloc>\n"
" </resource>\n"
" <resource>\n"
" <alloc>fopen</alloc>\n"
" <realloc realloc-arg=\"3\">freopen</realloc>\n"
" <dealloc>fclose</dealloc>\n"
" </resource>\n"
" <smart-pointer class-name=\"std::shared_ptr\"/>\n"
" <smart-pointer class-name=\"std::unique_ptr\">\n"
" <unique/>\n"
" </smart-pointer>\n"
"</def>";
settings = settingsBuilder(settings).libraryxml(xmldata, sizeof(xmldata)).build();
// Assign
TEST_CASE(assign1);
TEST_CASE(assign2);
TEST_CASE(assign3);
TEST_CASE(assign4);
TEST_CASE(assign5);
TEST_CASE(assign6);
TEST_CASE(assign7);
TEST_CASE(assign8);
TEST_CASE(assign9);
TEST_CASE(assign10);
TEST_CASE(assign11); // #3942: x = a(b(p));
TEST_CASE(assign12); // #4236: FP. bar(&x);
TEST_CASE(assign13); // #4237: FP. char*&ref=p; p=malloc(10); free(ref);
TEST_CASE(assign14);
TEST_CASE(assign15);
TEST_CASE(assign16);
TEST_CASE(assign17); // #9047
TEST_CASE(assign18);
TEST_CASE(assign19);
TEST_CASE(assign20); // #9187
TEST_CASE(assign21); // #10186
TEST_CASE(assign22); // #9139
TEST_CASE(assign23);
TEST_CASE(assign24); // #7440
TEST_CASE(assign25);
TEST_CASE(isAutoDealloc);
TEST_CASE(realloc1);
TEST_CASE(realloc2);
TEST_CASE(realloc3);
TEST_CASE(realloc4);
TEST_CASE(realloc5); // #9292, #9990
TEST_CASE(freopen1);
TEST_CASE(freopen2);
TEST_CASE(deallocuse1);
TEST_CASE(deallocuse3);
TEST_CASE(deallocuse4);
TEST_CASE(deallocuse5); // #4018: FP. free(p), p = 0;
TEST_CASE(deallocuse6); // #4034: FP. x = p = f();
TEST_CASE(deallocuse7); // #6467, #6469, #6473
TEST_CASE(deallocuse8); // #1765
TEST_CASE(deallocuse9); // #9781
TEST_CASE(deallocuse10);
TEST_CASE(deallocuse11); // #8302
TEST_CASE(deallocuse12);
TEST_CASE(deallocuse13);
TEST_CASE(deallocuse14);
TEST_CASE(doublefree1);
TEST_CASE(doublefree2);
TEST_CASE(doublefree3); // #4914
TEST_CASE(doublefree4); // #5451 - FP when exit is called
TEST_CASE(doublefree5); // #5522
TEST_CASE(doublefree6); // #7685
TEST_CASE(doublefree7);
TEST_CASE(doublefree8);
TEST_CASE(doublefree9);
TEST_CASE(doublefree10); // #8706
TEST_CASE(doublefree11);
TEST_CASE(doublefree12); // #10502
TEST_CASE(doublefree13); // #11008
TEST_CASE(doublefree14); // #9708
TEST_CASE(doublefree15);
TEST_CASE(doublefree16);
// exit
TEST_CASE(exit1);
TEST_CASE(exit2);
TEST_CASE(exit3);
// handling function calls
TEST_CASE(functioncall1);
// goto
TEST_CASE(goto1);
TEST_CASE(goto2);
TEST_CASE(goto3); // #11431
// if/else
TEST_CASE(ifelse1);
TEST_CASE(ifelse2);
TEST_CASE(ifelse3);
TEST_CASE(ifelse4);
TEST_CASE(ifelse5);
TEST_CASE(ifelse6); // #3370
TEST_CASE(ifelse7); // #5576 - if (fd < 0)
TEST_CASE(ifelse8); // #5747 - if (fd == -1)
TEST_CASE(ifelse9); // #5273 - if (X(p==NULL, 0))
TEST_CASE(ifelse10); // #8794 - if (!(x!=NULL))
TEST_CASE(ifelse11); // #8365 - if (NULL == (p = malloc(4)))
TEST_CASE(ifelse12); // #8340 - if ((*p = malloc(4)) == NULL)
TEST_CASE(ifelse13); // #8392
TEST_CASE(ifelse14); // #9130 - if (x == (char*)NULL)
TEST_CASE(ifelse15); // #9206 - if (global_ptr = malloc(1))
TEST_CASE(ifelse16); // #9635 - if (p = malloc(4), p == NULL)
TEST_CASE(ifelse17); // if (!!(!p))
TEST_CASE(ifelse18);
TEST_CASE(ifelse19);
TEST_CASE(ifelse20); // #10182
TEST_CASE(ifelse21);
TEST_CASE(ifelse22); // #10187
TEST_CASE(ifelse23); // #5473
TEST_CASE(ifelse24); // #1733
TEST_CASE(ifelse25); // #9966
TEST_CASE(ifelse26);
TEST_CASE(ifelse27);
TEST_CASE(ifelse28); // #11038
// switch
TEST_CASE(switch1);
// loops
TEST_CASE(loop1);
TEST_CASE(loop2);
// mismatching allocation/deallocation
TEST_CASE(mismatchAllocDealloc);
TEST_CASE(smartPointerDeleter);
TEST_CASE(smartPointerRelease);
// Execution reaches a 'return'
TEST_CASE(return1);
TEST_CASE(return2);
TEST_CASE(return3);
TEST_CASE(return4);
TEST_CASE(return5);
TEST_CASE(return6); // #8282 return {p, p}
TEST_CASE(return7); // #9343 return (uint8_t*)x
TEST_CASE(return8);
TEST_CASE(return9);
TEST_CASE(return10);
// General tests: variable type, allocation type, etc
TEST_CASE(test1);
TEST_CASE(test2);
TEST_CASE(test3); // #3954 - reference pointer
TEST_CASE(test4); // #5923 - static pointer
TEST_CASE(test5); // unknown type
// Execution reaches a 'throw'
TEST_CASE(throw1);
TEST_CASE(throw2);
// Possible leak => Further configuration is needed for complete analysis
TEST_CASE(configuration1);
TEST_CASE(configuration2);
TEST_CASE(configuration3);
TEST_CASE(configuration4);
TEST_CASE(configuration5);
TEST_CASE(configuration6);
TEST_CASE(ptrptr);
TEST_CASE(nestedAllocation);
TEST_CASE(testKeywords); // #6767
TEST_CASE(inlineFunction); // #3989
TEST_CASE(smartPtrInContainer); // #8262
TEST_CASE(functionCallCastConfig); // #9652
TEST_CASE(functionCallLeakIgnoreConfig); // #7923
}
#define check(...) check_(__FILE__, __LINE__, __VA_ARGS__)
void check_(const char* file, int line, const char code[], bool cpp = false, const Settings *s = nullptr) {
// Clear the error buffer..
errout.str("");
const Settings settings1 = settingsBuilder(s ? *s : settings).checkLibrary().build();
// Tokenize..
Tokenizer tokenizer(&settings1, this);
std::istringstream istr(code);
ASSERT_LOC(tokenizer.tokenize(istr, cpp ? "test.cpp" : "test.c"), file, line);
// Check for leaks..
runChecks<CheckLeakAutoVar>(tokenizer, this);
}
void check_(const char* file, int line, const char code[], const Settings & s) {
// Clear the error buffer..
errout.str("");
const Settings settings0 = settingsBuilder(s).checkLibrary().build();
// Tokenize..
Tokenizer tokenizer(&settings0, this);
std::istringstream istr(code);
ASSERT_LOC(tokenizer.tokenize(istr, "test.cpp"), file, line);
// Check for leaks..
runChecks<CheckLeakAutoVar>(tokenizer, this);
}
void assign1() {
check("void f() {\n"
" char *p = malloc(10);\n"
" p = NULL;\n"
" free(p);\n"
"}");
ASSERT_EQUALS("[test.c:3]: (error) Memory leak: p\n", errout.str());
}
void assign2() {
check("void f() {\n"
" char *p = malloc(10);\n"
" char *q = p;\n"
" free(q);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void assign3() {
check("void f() {\n"
" char *p = malloc(10);\n"
" char *q = p + 1;\n"
" free(q - 1);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void assign4() {
check("void f() {\n"
" char *a = malloc(10);\n"
" a += 10;\n"
" free(a - 10);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void assign5() {
check("void foo()\n"
"{\n"
" char *p = new char[100];\n"
" list += p;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void assign6() { // #2806 - FP when there is redundant assignment
check("void foo() {\n"
" char *p = malloc(10);\n"
" p = strcpy(p,q);\n"
" free(p);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void assign7() {
check("void foo(struct str *d) {\n"
" struct str *p = malloc(10);\n"
" d->p = p;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void assign8() { // linux list
check("void foo(struct str *d) {\n"
" struct str *p = malloc(10);\n"
" d->p = &p->x;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void assign9() {
check("void foo() {\n"
" char *p = x();\n"
" free(p);\n"
" p = NULL;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void assign10() {
check("void foo() {\n"
" char *p;\n"
" if (x) { p = malloc(10); }\n"
" if (!x) { p = NULL; }\n"
" free(p);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void assign11() { // #3942 - FP for x = a(b(p));
check("void f() {\n"
" char *p = malloc(10);\n"
" x = a(b(p));\n"
"}");
ASSERT_EQUALS("[test.c:4]: (information) --check-library: Function b() should have <use>/<leak-ignore> configuration\n", errout.str());
}
void assign12() { // #4236: FP. bar(&x)
check("void f() {\n"
" char *p = malloc(10);\n"
" free(p);\n"
" bar(&p);\n"
" free(p);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void assign13() { // #4237: FP. char *&ref=p; p=malloc(10); free(ref);
check("void f() {\n"
" char *p;\n"
" char * &ref = p;\n"
" p = malloc(10);\n"
" free(ref);\n"
"}", /*cpp*/ true);
TODO_ASSERT_EQUALS("", "[test.cpp:6]: (error) Memory leak: p\n", errout.str());
}
void assign14() {
check("void f(int x) {\n"
" char *p;\n"
" if (x && (p = malloc(10))) { }"
"}");
ASSERT_EQUALS("[test.c:3]: (error) Memory leak: p\n", errout.str());
check("void f(int x) {\n"
" char *p;\n"
" if (x && (p = new char[10])) { }"
"}", true);
ASSERT_EQUALS("[test.cpp:3]: (error) Memory leak: p\n", errout.str());
}
void assign15() {
// #8120
check("void f() {\n"
" baz *p;\n"
" p = malloc(sizeof *p);\n"
" free(p);\n"
" p = malloc(sizeof *p);\n"
" free(p);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void assign16() {
check("void f() {\n"
" char *p = malloc(10);\n"
" free(p);\n"
" if (p=dostuff()) *p = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void assign17() { // #9047
check("void f() {\n"
" char *p = (char*)malloc(10);\n"
"}");
ASSERT_EQUALS("[test.c:3]: (error) Memory leak: p\n", errout.str());
check("void f() {\n"
" char *p = (char*)(int*)malloc(10);\n"
"}");
ASSERT_EQUALS("[test.c:3]: (error) Memory leak: p\n", errout.str());
}
void assign18() {
check("void f(int x) {\n"
" char *p;\n"
" if (x && (p = (char*)malloc(10))) { }"
"}");
ASSERT_EQUALS("[test.c:3]: (error) Memory leak: p\n", errout.str());
check("void f(int x) {\n"
" char *p;\n"
" if (x && (p = (char*)(int*)malloc(10))) { }"
"}");
ASSERT_EQUALS("[test.c:3]: (error) Memory leak: p\n", errout.str());
}
void assign19() {
check("void f() {\n"
" char *p = malloc(10);\n"
" free((void*)p);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void assign20() { // #9187
check("void f() {\n"
" char *p = static_cast<int>(malloc(10));\n"
"}", true);
ASSERT_EQUALS("[test.cpp:3]: (error) Memory leak: p\n", errout.str());
}
void assign21() { // #10186
check("void f(int **x) {\n"
" void *p = malloc(10);\n"
" *x = (int*)p;\n"
"}", true);
ASSERT_EQUALS("", errout.str());
}
void assign22() { // #9139
check("void f(char tempFileName[256]) {\n"
" const int fd = socket(AF_INET, SOCK_PACKET, 0 );\n"
"}", true);
ASSERT_EQUALS("[test.cpp:3]: (error) Resource leak: fd\n", errout.str());
check("void f() {\n"
" const void * const p = malloc(10);\n"
"}", true);
ASSERT_EQUALS("[test.cpp:3]: (error) Memory leak: p\n", errout.str());
}
void assign23() {
const Settings s = settingsBuilder().library("posix.cfg").build();
check("void f() {\n"
" int n1, n2, n3, n4, n5, n6, n7, n8, n9, n10, n11, n12, n13, n14;\n"
" *&n1 = open(\"xx.log\", O_RDONLY);\n"
" *&(n2) = open(\"xx.log\", O_RDONLY);\n"
" *(&n3) = open(\"xx.log\", O_RDONLY);\n"
" *&*&n4 = open(\"xx.log\", O_RDONLY);\n"
" *&*&*&(n5) = open(\"xx.log\", O_RDONLY);\n"
" *&*&(*&n6) = open(\"xx.log\", O_RDONLY);\n"
" *&*(&*&n7) = open(\"xx.log\", O_RDONLY);\n"
" *(&*&n8) = open(\"xx.log\", O_RDONLY);\n"
" *&(*&*&(*&n9)) = open(\"xx.log\", O_RDONLY);\n"
" (n10) = open(\"xx.log\", O_RDONLY);\n"
" ((n11)) = open(\"xx.log\", O_RDONLY);\n"
" ((*&n12)) = open(\"xx.log\", O_RDONLY);\n"
" *(&(*&n13)) = open(\"xx.log\", O_RDONLY);\n"
" ((*&(*&n14))) = open(\"xx.log\", O_RDONLY);\n"
"}\n", true, &s);
ASSERT_EQUALS("[test.cpp:17]: (error) Resource leak: n1\n"
"[test.cpp:17]: (error) Resource leak: n2\n"
"[test.cpp:17]: (error) Resource leak: n3\n"
"[test.cpp:17]: (error) Resource leak: n4\n"
"[test.cpp:17]: (error) Resource leak: n5\n"
"[test.cpp:17]: (error) Resource leak: n6\n"
"[test.cpp:17]: (error) Resource leak: n7\n"
"[test.cpp:17]: (error) Resource leak: n8\n"
"[test.cpp:17]: (error) Resource leak: n9\n"
"[test.cpp:17]: (error) Resource leak: n10\n"
"[test.cpp:17]: (error) Resource leak: n11\n"
"[test.cpp:17]: (error) Resource leak: n12\n"
"[test.cpp:17]: (error) Resource leak: n13\n"
"[test.cpp:17]: (error) Resource leak: n14\n",
errout.str());
}
void assign24() {
check("void f() {\n" // #7440
" char* data = new char[100];\n"
" char** dataPtr = &data;\n"
" delete[] *dataPtr;\n"
"}\n", true);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" char* data = new char[100];\n"
" char** dataPtr = &data;\n"
" printf(\"test\");\n"
" delete[] *dataPtr;\n"
"}\n", true);
ASSERT_EQUALS("", errout.str());
check("void f() {\n" // #9279
" int* p = new int;\n"
" *p = 42;\n"
" g();\n"
"}\n", /*cpp*/ true);
ASSERT_EQUALS("[test.cpp:4]: (information) --check-library: Function g() should have <noreturn> configuration\n",
errout.str());
check("void g();\n"
"void f() {\n"
" int* p = new int;\n"
" *p = 42;\n"
" g();\n"
"}\n", /*cpp*/ true);
ASSERT_EQUALS("[test.cpp:6]: (error) Memory leak: p\n", errout.str());
check("void g() {}\n"
"void f() {\n"
" int* p = new int;\n"
" *p = 42;\n"
" g();\n"
"}\n", /*cpp*/ true);
ASSERT_EQUALS("[test.cpp:6]: (error) Memory leak: p\n", errout.str());
check("[[noreturn]] void g();\n"
"void f() {\n"
" int* p = new int;\n"
" *p = 42;\n"
" g();\n"
"}\n", /*cpp*/ true);
ASSERT_EQUALS("", errout.str());
check("void g() { exit(1); }\n"
"void f() {\n"
" int* p = new int;\n"
" *p = 42;\n"
" g();\n"
"}\n", /*cpp*/ true);
ASSERT_EQUALS("", errout.str());
check("void g() {}\n" // #10517
"void f() {\n"
" char* p = malloc(10);\n"
" g();\n"
"}\n");
ASSERT_EQUALS("[test.c:5]: (error) Memory leak: p\n", errout.str());
}
void assign25() {
check("void f() {\n" // #11796
" int* p{ new int };\n"
" int* q(new int);\n"
"}", true);
ASSERT_EQUALS("[test.cpp:4]: (error) Memory leak: p\n"
"[test.cpp:4]: (error) Memory leak: q\n",
errout.str());
check("struct S : B {\n" // #12239
" void f();\n"
" void g();\n"
"};\n"
"void S::f() {\n"
" FD* fd(new FD(this));\n"
" fd->exec();\n"
"}\n"
"void S::g() {\n"
" FD* fd{ new FD(this) };\n"
" fd->exec();\n"
"}\n", true);
ASSERT_EQUALS("", errout.str());
}
void isAutoDealloc() {
check("void f() {\n"
" char *p = new char[100];"
"}", true);
ASSERT_EQUALS("[test.cpp:2]: (error) Memory leak: p\n", errout.str());
check("void f() {\n"
" Fred *fred = new Fred;"
"}", true);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" std::string *str = new std::string;"
"}", true);
TODO_ASSERT_EQUALS("[test.cpp:2]: (error) Memory leak: str\n", "", errout.str());
check("class TestType {\n" // #9028
"public:\n"
" char ca[12];\n"
"};\n"
"void f() {\n"
" TestType *tt = new TestType();\n"
"}", true);
ASSERT_EQUALS("[test.cpp:7]: (error) Memory leak: tt\n", errout.str());
check("void f(Bar& b) {\n" // #7622
" char* data = new char[10];\n"
" b = Bar(*new Foo(data));\n"
"}", /*cpp*/ true);
ASSERT_EQUALS("[test.cpp:4]: (information) --check-library: Function Foo() should have <use>/<leak-ignore> configuration\n", errout.str());
check("class B {};\n"
" class D : public B {};\n"
" void g() {\n"
" auto d = new D();\n"
" if (d) {}\n"
"}", /*cpp*/ true);
ASSERT_EQUALS("[test.cpp:6]: (error) Memory leak: d\n", errout.str());
}
void realloc1() {
check("void f() {\n"
" void *p = malloc(10);\n"
" void *q = realloc(p, 20);\n"
" free(q)\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void realloc2() {
check("void f() {\n"
" void *p = malloc(10);\n"
" void *q = realloc(p, 20);\n"
"}");
ASSERT_EQUALS("[test.c:4]: (error) Memory leak: q\n", errout.str());
}
void realloc3() {
check("void f() {\n"
" char *p = malloc(10);\n"
" char *q = (char*) realloc(p, 20);\n"
"}");
ASSERT_EQUALS("[test.c:4]: (error) Memory leak: q\n", errout.str());
}
void realloc4() {
check("void f(void *p) {\n"
" void * q = realloc(p, 10);\n"
" if (q == NULL)\n"
" return;\n"
"}");
ASSERT_EQUALS("[test.c:5]: (error) Memory leak: q\n", errout.str());
}
void realloc5() {
// #9292
check("void * f(void * ptr, size_t size) {\n"
" void *datap = realloc(ptr, size);\n"
" if (size && !datap)\n"
" free(ptr);\n"
" return datap;\n"
"}");
ASSERT_EQUALS("", errout.str());
// #9990
check("void f() {\n"
" void * p1 = malloc(10);\n"
" if (!p1)\n"
" return;\n"
" void * p2 = realloc(p1, 42);\n"
" if (!p2) {\n"
" free(p1);\n"
" return;\n"
" }\n"
" free(p2);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void freopen1() {
check("void f() {\n"
" void *p = fopen(name,a);\n"
" void *q = freopen(name, b, p);\n"
" fclose(q)\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void freopen2() {
check("void f() {\n"
" void *p = fopen(name,a);\n"
" void *q = freopen(name, b, p);\n"
"}");
ASSERT_EQUALS("[test.c:4]: (error) Resource leak: q\n", errout.str());
}
void deallocuse1() {
check("void f(char *p) {\n"
" free(p);\n"
" *p = 0;\n"
"}");
ASSERT_EQUALS("[test.c:3]: (error) Dereferencing 'p' after it is deallocated / released\n", errout.str());
check("void f(char *p) {\n"
" free(p);\n"
" char c = *p;\n"
"}");
ASSERT_EQUALS("[test.c:3]: (error) Dereferencing 'p' after it is deallocated / released\n", errout.str());
}
void deallocuse3() {
check("void f(struct str *p) {\n"
" free(p);\n"
" p = p->next;\n"
"}");
ASSERT_EQUALS("[test.c:3]: (error) Dereferencing 'p' after it is deallocated / released\n", errout.str());
}
void deallocuse4() {
check("void f(char *p) {\n"
" free(p);\n"
" return p;\n"
"}");
ASSERT_EQUALS("[test.c:2] -> [test.c:3]: (error) Returning/dereferencing 'p' after it is deallocated / released\n", errout.str());
check("void f(char *p) {\n"
" if (!p) free(p);\n"
" return p;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(char *p) {\n"
" if (!p) delete p;\n"
" return p;\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check("void f(char *p) {\n"
" if (!p) delete [] p;\n"
" return p;\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check("void f(void* p) {\n"
" if (a) {\n"
" free(p);\n"
" return;\n"
" }\n"
" g(p);\n"
" return;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void deallocuse5() { // #4018
check("void f(char *p) {\n"
" free(p), p = 0;\n"
" *p = 0;\n" // <- Make sure pointer info is reset. It is NOT a freed pointer dereference
"}");
ASSERT_EQUALS("", errout.str());
}
void deallocuse6() { // #4034
check("void f(char *p) {\n"
" free(p);\n"
" x = p = foo();\n" // <- p is not dereferenced
"}");
ASSERT_EQUALS("", errout.str());
}
void deallocuse7() { // #6467, #6469, #6473, #6648
check("struct Foo { int* ptr; };\n"
"void f(Foo* foo) {\n"
" delete foo->ptr;\n"
" foo->ptr = new Foo;\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check("struct Foo { int* ptr; };\n"
"void f(Foo* foo) {\n"
" delete foo->ptr;\n"
" x = *foo->ptr;\n"
"}", true);
TODO_ASSERT_EQUALS("[test.cpp:4]: (error) Dereferencing 'ptr' after it is deallocated / released\n", "", errout.str());
check("void parse() {\n"
" struct Buf {\n"
" Buf(uint32_t len) : m_buf(new uint8_t[len]) {}\n"
" ~Buf() { delete[]m_buf; }\n"
" uint8_t *m_buf;\n"
" };\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check("struct Foo {\n"
" Foo();\n"
" Foo* ptr;\n"
" void func();\n"
"};\n"
"void bar(Foo* foo) {\n"
" delete foo->ptr;\n"
" foo->ptr = new Foo;\n"
" foo->ptr->func();\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check("void foo(void (*conv)(char**)) {\n"
" char * ptr=(char*)malloc(42);\n"
" free(ptr);\n"
" (*conv)(&ptr);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void deallocuse8() { // #1765
check("void f() {\n"
" int *ptr = new int;\n"
" delete(ptr);\n"
" *ptr = 0;\n"
"}", true);
ASSERT_EQUALS("[test.cpp:4]: (error) Dereferencing 'ptr' after it is deallocated / released\n", errout.str());
}
void deallocuse9() {
check("void f(Type* p) {\n" // #9781
" std::shared_ptr<Type> sp(p);\n"
" bool b = p->foo();\n"
" return b;\n"
"}\n", /*cpp*/ true);
ASSERT_EQUALS("", errout.str());
check("struct A {\n" // #8635
" std::vector<std::unique_ptr<A>> array_;\n"
" A* foo() {\n"
" A* a = new A();\n"
" array_.push_back(std::unique_ptr<A>(a));\n"
" return a;\n"
" }\n"
"};\n", /*cpp*/ true);
ASSERT_EQUALS("", errout.str());
check("int g(int *p) {\n" // #9838
" std::unique_ptr<int> temp(p);\n"
" return DoSomething(p);\n"
"}\n"
"int f() {\n"
" return g(new int(3));\n"
"}\n", /*cpp*/ true);
ASSERT_EQUALS("", errout.str());
}
void deallocuse10() {
check("void f(char* p) {\n"
" free(p);\n"
" p[0] = 10;\n"
"}\n");
ASSERT_EQUALS("[test.c:3]: (error) Dereferencing 'p' after it is deallocated / released\n", errout.str());
check("int f(int* p) {\n"
" free(p);\n"
" return p[1];\n"
"}\n");
ASSERT_EQUALS("[test.c:2] -> [test.c:3]: (error) Returning/dereferencing 'p' after it is deallocated / released\n", errout.str());
}
void deallocuse11() { // #8302
check("int f() {\n"
" int *array = new int[42];\n"
" delete [] array;\n"
" return array[1];" // <<
"}", true);
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (error) Returning/dereferencing 'array' after it is deallocated / released\n", errout.str());
check("int f() {\n"
" int *array = (int*)malloc(40);\n"
" free(array);\n"
" return array[1];" // <<
"}");
ASSERT_EQUALS("[test.c:3] -> [test.c:4]: (error) Returning/dereferencing 'array' after it is deallocated / released\n", errout.str());
}
void deallocuse12() {
check("struct foo { int x; }\n"
"void f1(struct foo *f) {\n"
" free(f);\n"
"}\n"
"void f2(struct foo *f, int *out) {\n"
" *out = f->x;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void deallocuse13() {
check("void f() {\n" // #9695
" auto* a = new int[2];\n"
" delete[] a;\n"
" a[1] = 0;\n"
" auto* b = static_cast<int*>(malloc(8));\n"
" free(b);\n"
" b[1] = 0;\n"
"}\n", true);
ASSERT_EQUALS("[test.cpp:4]: (error) Dereferencing 'a' after it is deallocated / released\n"
"[test.cpp:7]: (error) Dereferencing 'b' after it is deallocated / released\n",
errout.str());
}
void deallocuse14() {
check("struct S { void f(); };\n" // #10905
"void g() {\n"
" S* s = new S;\n"
" delete s;\n"
" s->f();\n"
"}\n", true);
ASSERT_EQUALS("[test.cpp:5]: (error) Dereferencing 's' after it is deallocated / released\n",
errout.str());
check("void f() {\n"
" int *p = (int*)malloc(4);\n"
" free(p);\n"
" if (*p == 5) {}\n"
"}\n");
ASSERT_EQUALS("[test.c:4]: (error) Dereferencing 'p' after it is deallocated / released\n",
errout.str());
}
void doublefree1() { // #3895
check("void f(char *p) {\n"
" if (x)\n"
" free(p);\n"
" else\n"
" p = 0;\n"
" free(p);\n"
"}");
ASSERT_EQUALS("[test.c:3] -> [test.c:6]: (error) Memory pointed to by 'p' is freed twice.\n", errout.str());
check(
"void foo(char *p) {\n"
" free(p);\n"
" free(p);\n"
"}");
ASSERT_EQUALS("[test.c:2] -> [test.c:3]: (error) Memory pointed to by 'p' is freed twice.\n", errout.str());
check(
"void foo(char *p, char *r) {\n"
" free(p);\n"
" free(r);\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"void foo() {\n"
" free(p);\n"
" free(r);\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"void foo(char *p) {\n"
" if (x < 3) free(p);\n"
" else { if (x > 9) free(p); }\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"void foo(char *p) {\n"
" free(p);\n"
" getNext(&p);\n"
" free(p);\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"void foo(char *p) {\n"
" free(p);\n"
" bar();\n"
" free(p);\n"
"}");
ASSERT_EQUALS("[test.c:2] -> [test.c:4]: (error) Memory pointed to by 'p' is freed twice.\n", errout.str());
check(
"void foo(char *p) {\n"
" free(p);\n"
" printf(\"Freed memory at location %x\", p);\n"
" free(p);\n"
"}");
ASSERT_EQUALS("[test.c:2] -> [test.c:4]: (error) Memory pointed to by 'p' is freed twice.\n", errout.str());
check(
"void foo(FILE *p) {\n"
" fclose(p);\n"
" fclose(p);\n"
"}");
ASSERT_EQUALS("[test.c:2] -> [test.c:3]: (error) Resource handle 'p' freed twice.\n", errout.str());
check(
"void foo(FILE *p, FILE *r) {\n"
" fclose(p);\n"
" fclose(r);\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"void foo(FILE *p) {\n"
" if (x < 3) fclose(p);\n"
" else { if (x > 9) fclose(p); }\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"void foo(FILE *p) {\n"
" fclose(p);\n"
" gethandle(&p);\n"
" fclose(p);\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"void foo(FILE *p) {\n"
" fclose(p);\n"
" gethandle();\n"
" fclose(p);\n"
"}");
ASSERT_EQUALS("[test.c:2] -> [test.c:4]: (error) Resource handle 'p' freed twice.\n", errout.str());
check(
"void foo(Data* p) {\n"
" free(p->a);\n"
" free(p->b);\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"void f() {\n"
" char *p; p = malloc(100);\n"
" if (x) {\n"
" free(p);\n"
" exit();\n"
" }\n"
" free(p);\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"void f() {\n"
" char *p; p = malloc(100);\n"
" if (x) {\n"
" free(p);\n"
" x = 0;\n"
" }\n"
" free(p);\n"
"}");
ASSERT_EQUALS("[test.c:4] -> [test.c:7]: (error) Memory pointed to by 'p' is freed twice.\n", errout.str());
check(
"void f() {\n"
" char *p; p = do_something();\n"
" free(p);\n"
" p = do_something();\n"
" free(p);\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"void foo(char *p) {\n"
" delete p;\n"
" delete p;\n"
"}", true);
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (error) Memory pointed to by 'p' is freed twice.\n", errout.str());
check(
"void foo(char *p, char *r) {\n"
" delete p;\n"
" delete r;\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check(
"void foo(P p) {\n"
" delete p.x;\n"
" delete p;\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check(
"void foo(char **p) {\n"
" delete p[0];\n"
" delete p[1];\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check(
"void foo(char *p) {\n"
" delete p;\n"
" getNext(&p);\n"
" delete p;\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check(
"void foo(char *p) {\n"
" delete p;\n"
" bar();\n"
" delete p;\n"
"}", true);
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:4]: (error) Memory pointed to by 'p' is freed twice.\n", errout.str());
check(
"void foo(char *p) {\n"
" delete[] p;\n"
" delete[] p;\n"
"}", true);
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (error) Memory pointed to by 'p' is freed twice.\n", errout.str());
check(
"void foo(char *p, char *r) {\n"
" delete[] p;\n"
" delete[] r;\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check(
"void foo(char *p) {\n"
" delete[] p;\n"
" getNext(&p);\n"
" delete[] p;\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check(
"void foo(char *p) {\n"
" delete[] p;\n"
" bar();\n"
" delete[] p;\n"
"}", true);
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:4]: (error) Memory pointed to by 'p' is freed twice.\n", errout.str());
check(
"LineMarker::~LineMarker() {\n"
" delete pxpm;\n"
"}\n"
"LineMarker &LineMarker::operator=(const LineMarker &) {\n"
" delete pxpm;\n"
" pxpm = NULL;\n"
" return *this;\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check(
"void foo()\n"
"{\n"
" int* ptr; ptr = NULL;\n"
" try\n"
" {\n"
" ptr = new int(4);\n"
" }\n"
" catch(...)\n"
" {\n"
" delete ptr;\n"
" throw;\n"
" }\n"
" delete ptr;\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check(
"int foo()\n"
"{\n"
" int* a; a = new int;\n"
" bool doDelete; doDelete = true;\n"
" if (a != 0)\n"
" {\n"
" doDelete = false;\n"
" delete a;\n"
" }\n"
" if(doDelete)\n"
" delete a;\n"
" return 0;\n"
"}", true);
TODO_ASSERT_EQUALS("", "[test.cpp:8] -> [test.cpp:11]: (error) Memory pointed to by 'a' is freed twice.\n", errout.str());
check(
"void foo(int y)\n"
"{\n"
" char * x; x = NULL;\n"
" while(true) {\n"
" x = new char[100];\n"
" if (y++ > 100)\n"
" break;\n"
" delete[] x;\n"
" }\n"
" delete[] x;\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check(
"void foo(int y)\n"
"{\n"
" char * x; x = NULL;\n"
" for (int i = 0; i < 10000; i++) {\n"
" x = new char[100];\n"
" delete[] x;\n"
" }\n"
" delete[] x;\n"
"}", true);
TODO_ASSERT_EQUALS("[test.cpp:8]: (error) Memory pointed to by 'x' is freed twice.\n", "", errout.str());
check(
"void foo(int y)\n"
"{\n"
" char * x; x = NULL;\n"
" while (isRunning()) {\n"
" x = new char[100];\n"
" delete[] x;\n"
" }\n"
" delete[] x;\n"
"}", true);
TODO_ASSERT_EQUALS("[test.cpp:8]: (error) Memory pointed to by 'x' is freed twice.\n", "", errout.str());
check(
"void foo(int y)\n"
"{\n"
" char * x; x = NULL;\n"
" while (isRunning()) {\n"
" x = malloc(100);\n"
" free(x);\n"
" }\n"
" free(x);\n"
"}");
TODO_ASSERT_EQUALS("[test.c:8]: (error) Memory pointed to by 'x' is freed twice.\n", "", errout.str());
check(
"void foo(int y)\n"
"{\n"
" char * x; x = NULL;\n"
" for (;;) {\n"
" x = new char[100];\n"
" if (y++ > 100)\n"
" break;\n"
" delete[] x;\n"
" }\n"
" delete[] x;\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check(
"void foo(int y)\n"
"{\n"
" char * x; x = NULL;\n"
" do {\n"
" x = new char[100];\n"
" if (y++ > 100)\n"
" break;\n"
" delete[] x;\n"
" } while (true);\n"
" delete[] x;\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check(
"void f()\n"
"{\n"
" char *p; p = 0;\n"
" if (x < 100) {\n"
" p = malloc(10);\n"
" free(p);\n"
" }\n"
" free(p);\n"
"}");
ASSERT_EQUALS("[test.c:6] -> [test.c:8]: (error) Memory pointed to by 'p' is freed twice.\n", errout.str());
check(
"void MyFunction()\n"
"{\n"
" char* data; data = new char[100];\n"
" try\n"
" {\n"
" }\n"
" catch(err)\n"
" {\n"
" delete[] data;\n"
" MyThrow(err);\n"
" }\n"
" delete[] data;\n"
"}\n"
"void MyThrow(err)\n"
"{\n"
" throw(err);\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check(
"void MyFunction()\n"
"{\n"
" char* data; data = new char[100];\n"
" try\n"
" {\n"
" }\n"
" catch(err)\n"
" {\n"
" delete[] data;\n"
" MyExit(err);\n"
" }\n"
" delete[] data;\n"
"}\n"
"void MyExit(err)\n"
"{\n"
" exit(err);\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check( // #6252
"struct Wrapper {\n"
" Thing* m_thing;\n"
" Wrapper() : m_thing(0) {\n"
" }\n"
" ~Wrapper() {\n"
" delete m_thing;\n"
" }\n"
" void changeThing() {\n"
" delete m_thing;\n"
" m_thing = new Thing;\n"
" }\n"
"};", true);
ASSERT_EQUALS("", errout.str());
// #7401
check("void pCodeLabelDestruct(pCode *pc) {\n"
" free(PCL(pc)->label);\n"
" free(pc);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void doublefree2() { // #3891
check("void *f(int a) {\n"
" char *p = malloc(10);\n"
" if (a == 2) { free(p); return ((void*)1); }\n"
" free(p);\n"
" return 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void doublefree3() { // #4914
check("void foo() {\n"
" bool done = false;\n"
" do {\n"
" char *bar = malloc(10)\n"
" if(condition()) {\n"
" free(bar);\n"
" continue;\n"
" }\n"
" done = true;\n"
" free(bar)\n"
" } while(!done);\n"
" return;"
"}"
);
ASSERT_EQUALS("", errout.str());
}
void doublefree4() {
check("void f(char *p) {\n" // #5451 - exit
" if (x) {\n"
" free(p);\n"
" exit(1);\n"
" }\n"
" free(p);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(void* p, int i) {\n" // #11391
" if (i)\n"
" goto cleanup;\n"
" free(p);\n"
" exit(0);\n"
"cleanup:\n"
" free(p);\n"
" exit(1);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void doublefree5() { // #5522
check("void f(char *p) {\n"
" free(p);\n"
" x = (q == p);\n"
" free(p);\n"
"}");
ASSERT_EQUALS("[test.c:2] -> [test.c:4]: (error) Memory pointed to by 'p' is freed twice.\n", errout.str());
}
void doublefree6() { // #7685
check("void do_wordexp(FILE *f) {\n"
" free(getword(f));\n"
" fclose(f);\n"
"}", /*cpp=*/ false);
ASSERT_EQUALS("", errout.str());
}
void doublefree7() {
check("void f(char *p, int x) {\n"
" free(p);\n"
" if (x && (p = malloc(10)))\n"
" free(p);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(char *p, int x) {\n"
" delete[] p;\n"
" if (x && (p = new char[10]))\n"
" delete[] p;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void doublefree8() {
check("void f() {\n"
" int * i = new int;\n"
" std::unique_ptr<int> x(i);\n"
" delete i;\n"
"}\n", true);
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (error) Memory pointed to by 'i' is freed twice.\n", errout.str());
check("void f() {\n"
" int * i = new int;\n"
" delete i;\n"
" std::unique_ptr<int> x(i);\n"
"}\n", true);
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (error) Memory pointed to by 'i' is freed twice.\n", errout.str());
check("void f() {\n"
" int * i = new int;\n"
" std::unique_ptr<int> x{i};\n"
" delete i;\n"
"}\n", true);
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (error) Memory pointed to by 'i' is freed twice.\n", errout.str());
check("void f() {\n"
" int * i = new int;\n"
" std::shared_ptr<int> x(i);\n"
" delete i;\n"
"}\n", true);
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (error) Memory pointed to by 'i' is freed twice.\n", errout.str());
check("void f() {\n"
" int * i = new int;\n"
" std::shared_ptr<int> x{i};\n"
" delete i;\n"
"}\n", true);
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (error) Memory pointed to by 'i' is freed twice.\n", errout.str());
// Check for use-after-free FP
check("void f() {\n"
" int * i = new int;\n"
" std::shared_ptr<int> x{i};\n"
" *i = 123;\n"
"}\n", true);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int * i = new int[1];\n"
" std::unique_ptr<int[]> x(i);\n"
" delete i;\n"
"}\n", true);
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (error) Memory pointed to by 'i' is freed twice.\n", errout.str());
check("using namespace std;\n" // #9708
"void f() {\n"
" int* i = new int;\n"
" unique_ptr<int> x(i);\n"
" delete i;\n"
"}\n", true);
ASSERT_EQUALS("[test.cpp:4] -> [test.cpp:5]: (error) Memory pointed to by 'i' is freed twice.\n", errout.str());
}
void doublefree9() {
check("struct foo {\n"
" int* get(int) { return new int(); }\n"
"};\n"
"void f(foo* b) {\n"
" std::unique_ptr<int> x(b->get(0));\n"
" std::unique_ptr<int> y(b->get(1));\n"
"}\n", true);
ASSERT_EQUALS("", errout.str());
}
void doublefree10() {
check("void f(char* s) {\n"
" char *p = malloc(strlen(s));\n"
" if (p != NULL) {\n"
" strcat(p, s);\n"
" if (strlen(s) != 10)\n"
" free(p); p = NULL;\n"
" }\n"
" if (p != NULL)\n"
" free(p);\n"
"}\n", true);
ASSERT_EQUALS("", errout.str());
check("void f(char* s) {\n"
" char *p = malloc(strlen(s));\n"
" if (p != NULL) {\n"
" strcat(p, s);\n"
" if (strlen(s) != 10)\n"
" free(p), p = NULL;\n"
" }\n"
" if (p != NULL)\n"
" free(p);\n"
"}\n", true);
ASSERT_EQUALS("", errout.str());
}
void doublefree11() {
check("void f() {\n"
" void * p = malloc(5);\n"
" void * q = realloc(p, 10);\n"
" if (q == NULL) {\n"
" free(p);\n"
" return;\n"
" }\n"
" free(p);\n"
" if (q == NULL)\n"
" return;\n"
" free(q)\n"
"}");
ASSERT_EQUALS("[test.c:3] -> [test.c:8]: (error) Memory pointed to by 'p' is freed twice.\n", errout.str());
}
void doublefree12() { // #10502
check("int f(FILE *fp, const bool b) {\n"
" if (b)\n"
" return fclose(fp);\n"
" fclose(fp);\n"
" return 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void doublefree13() { // #11008
check("struct buf_t { void* ptr; };\n"
"void f() {\n"
" struct buf_t buf;\n"
" if ((buf.ptr = malloc(10)) == NULL)\n"
" return;\n"
" free(buf.ptr);\n"
" if ((buf.ptr = malloc(10)) == NULL)\n"
" return;\n"
" free(buf.ptr);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void doublefree14() { // #9708
check("using namespace std;\n"
" \n"
"int main()\n"
"{\n"
" int *i = new int;\n"
" unique_ptr<int> x(i);\n"
" delete i;\n"
"}", true);
ASSERT_EQUALS("[test.cpp:6] -> [test.cpp:7]: (error) Memory pointed to by 'i' is freed twice.\n", errout.str());
check("using namespace std;\n"
" \n"
"int main()\n"
"{\n"
" int *i = new int;\n"
" unique_ptr<int> x(i);\n"
"}", true);
ASSERT_EQUALS("", errout.str());
}
void doublefree15() { // #11966
check("void f(FILE* fp) {\n"
" static_cast<void>(fclose(fp));\n"
"}", true);
ASSERT_EQUALS("", errout.str());
}
void doublefree16() { // #12236
check("void f() {\n"
" FILE* f = fopen(\"abc\", \"r\");\n"
" decltype(fclose(f)) y;\n"
" y = fclose(f);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void exit1() {
check("void f() {\n"
" char *p = malloc(10);\n"
" exit(0);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void exit2() {
check("void f() {\n"
" char *p = malloc(10);\n"
" fatal_error();\n"
"}");
ASSERT_EQUALS("[test.c:3]: (information) --check-library: Function fatal_error() should have <noreturn> configuration\n",
errout.str());
}
void exit3() {
check("void f() {\n"
" char *p = malloc(100);\n"
" if (x) {\n"
" free(p);\n"
" ::exit(0);\n"
" }"
" free(p);\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" char *p = malloc(100);\n"
" if (x) {\n"
" free(p);\n"
" std::exit(0);\n"
" }"
" free(p);\n"
"}", true);
ASSERT_EQUALS("", errout.str());
}
void functioncall1() {
check("void f(struct S *p) {\n"
" p->x = malloc(10);\n"
" free(p->x);\n"
" p->x = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(s_t s) {\n" // #11061
" s->p = (char*)malloc(10);\n"
" free((void*)s->p);\n"
" s->p = NULL;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
const Settings s = settingsBuilder().library("std.cfg").build();
check("struct S {};\n"
"void f(int i, std::vector<std::unique_ptr<S>> &v) {\n"
" if (i < 1) {\n"
" auto s = new S;\n"
" v.push_back(std::unique_ptr<S>(s));\n"
" }\n"
"}\n", &s);
ASSERT_EQUALS("", errout.str()); // don't crash
}
void goto1() {
check("static void f() {\n"
" int err = -ENOMEM;\n"
" char *reg = malloc(100);\n"
" if (err) {\n"
" free(reg);\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void goto2() { // #4231
check("static char * f() {\n"
"x:\n"
" char *p = malloc(100);\n"
" if (err) {\n"
" free(p);\n"
" goto x;\n"
" }\n"
" return p;\n" // no error since there is a goto
"}");
ASSERT_EQUALS("", errout.str());
}
void goto3() { // #11431
check("void f() {\n"
" int* p = (int*)malloc(2);\n"
" if (!p) {\n"
" p = (int*)malloc(1);\n"
" if (!p)\n"
" goto err;\n"
" }\n"
" free(p);\n"
"err:\n"
" (void)0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void ifelse1() {
check("int f() {\n"
" char *p = NULL;\n"
" if (x) { p = malloc(10); }\n"
" else { return 0; }\n"
" free(p);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void ifelse2() {
check("int f() {\n"
" char *p = NULL;\n"
" if (x) { p = malloc(10); }\n"
" else { return 0; }\n"
"}");
ASSERT_EQUALS("[test.c:5]: (error) Memory leak: p\n", errout.str());
}
void ifelse3() {
check("void f() {\n"
" char *p = malloc(10);\n"
" if (!p) { return; }\n"
" free(p);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("char * f(size_t size) {"
" void *p = malloc(1);"
" if (!p && size != 0)"
" return NULL;"
" return p;"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" char *p = malloc(10);\n"
" if (p) { } else { return; }\n"
" free(p);\n"
"}");
ASSERT_EQUALS("", errout.str());
// #3866 - UNLIKELY
check("void f() {\n"
" char *p = malloc(10);\n"
" if (UNLIKELY(!p)) { return; }\n"
" free(p);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void ifelse4() {
check("void f(int x) {\n"
" char *p;\n"
" if (x) { p = malloc(10); }\n"
" if (x) { free(p); }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" char *p;\n"
" if (x) { p = malloc(10); }\n"
" if (!x) { return; }\n"
" free(p);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void ifelse5() {
check("void f() {\n"
" char *p = malloc(10);\n"
" if (!p && x) { p = malloc(10); }\n"
" free(p);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void ifelse6() { // #3370
check("void f(int x) {\n"
" int *a = malloc(20);\n"
" if (x)\n"
" free(a);\n"
" else\n"
" a = 0;\n"
"}");
ASSERT_EQUALS("[test.c:6]: (error) Memory leak: a\n", errout.str());
}
void ifelse7() { // #5576
check("void f() {\n"
" int x = malloc(20);\n"
" if (x < 0)\n" // assume negative value indicates its unallocated
" return;\n"
" free(x);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void ifelse8() { // #5747
check("int f() {\n"
" int fd = socket(AF_INET, SOCK_PACKET, 0 );\n"
" if (fd == -1)\n"
" return -1;\n"
" return fd;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int f() {\n"
" int fd = socket(AF_INET, SOCK_PACKET, 0 );\n"
" if (fd != -1)\n"
" return fd;\n"
" return -1;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void ifelse9() { // #5273
check("void f() {\n"
" char *p = malloc(100);\n"
" if (dostuff(p==NULL,0))\n"
" return;\n"
" free(p);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void ifelse10() { // #8794
check("void f() {\n"
" void *x = malloc(1U);\n"
" if (!(x != NULL))\n"
" return;\n"
" free(x);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void ifelse11() { // #8365
check("void f() {\n"
" void *p;\n"
" if (NULL == (p = malloc(4)))\n"
" return;\n"
" free(p);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void ifelse12() { // #8340
check("void f(char **p) {\n"
" if ((*p = malloc(4)) == NULL)\n"
" return;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void ifelse13() { // #8392
check("int f(int fd, const char *mode) {\n"
" char *path;\n"
" if (fd == -1 || (path = (char *)malloc(10)) == NULL)\n"
" return 1;\n"
" free(path);\n"
" return 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int f(int fd, const char *mode) {\n"
" char *path;\n"
" if ((path = (char *)malloc(10)) == NULL || fd == -1)\n"
" return 1;\n" // <- memory leak
" free(path);\n"
" return 0;\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:4] memory leak", "", errout.str());
}
void ifelse14() { // #9130
check("char* f() {\n"
" char* buf = malloc(10);\n"
" if (buf == (char*)NULL)\n"
" return NULL;\n"
" return buf;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void ifelse15() { // #9206
check("struct SSS { int a; };\n"
"SSS* global_ptr;\n"
"void test_alloc() {\n"
" if ( global_ptr = new SSS()) {}\n"
" return;\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check("FILE* hFile;\n"
"int openFile( void ) {\n"
" if ((hFile = fopen(\"1.txt\", \"wb\" )) == NULL) return 0;\n"
" return 1;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void ifelse16() { // #9635
check("void f(void) {\n"
" char *p;\n"
" if(p = malloc(4), p == NULL)\n"
" return;\n"
" free(p);\n"
" return;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(void) {\n"
" char *p, q;\n"
" if(p = malloc(4), q = 1, p == NULL)\n"
" return;\n"
" free(p);\n"
" return;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void ifelse17() {
check("int *f() {\n"
" int *p = realloc(nullptr, 10);\n"
" if (!p)\n"
" return NULL;\n"
" return p;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int *f() {\n"
" int *p = realloc(nullptr, 10);\n"
" if (!!(!p))\n"
" return NULL;\n"
" return p;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void ifelse18() {
check("void f() {\n"
" void * p = malloc(10);\n"
" void * q = realloc(p, 20);\n"
" if (q == 0)\n"
" return;\n"
" free(q);\n"
"}");
ASSERT_EQUALS("[test.c:5]: (error) Memory leak: p\n", errout.str());
check("void f() {\n"
" void * p = malloc(10);\n"
" void * q = realloc(p, 20);\n"
" if (q != 0) {\n"
" free(q);\n"
" return;\n"
" } else\n"
" return;\n"
"}");
ASSERT_EQUALS("[test.c:8]: (error) Memory leak: p\n", errout.str());
}
void ifelse19() {
check("void f() {\n"
" static char * a;\n"
" char * b = realloc(a, 10);\n"
" if (!b)\n"
" return;\n"
" a = b;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void ifelse20() {
check("void f() {\n"
" if (x > 0)\n"
" void * p1 = malloc(5);\n"
" else\n"
" void * p2 = malloc(2);\n"
" return;\n"
"}");
ASSERT_EQUALS("[test.c:3]: (error) Memory leak: p1\n"
"[test.c:5]: (error) Memory leak: p2\n", errout.str());
check("void f() {\n"
" if (x > 0)\n"
" void * p1 = malloc(5);\n"
" else\n"
" void * p2 = malloc(2);\n"
"}");
ASSERT_EQUALS("[test.c:3]: (error) Memory leak: p1\n"
"[test.c:5]: (error) Memory leak: p2\n", errout.str());
}
void ifelse21() {
check("void f() {\n"
" if (y) {\n"
" void * p;\n"
" if (x > 0)\n"
" p = malloc(5);\n"
" }\n"
" return;\n"
"}");
ASSERT_EQUALS("[test.c:6]: (error) Memory leak: p\n", errout.str());
}
void ifelse22() { // #10187
check("int f(const char * pathname, int flags) {\n"
" int fd = socket(pathname, flags);\n"
" if (fd >= 0)\n"
" return fd;\n"
" return -1;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int f(const char * pathname, int flags) {\n"
" int fd = socket(pathname, flags);\n"
" if (fd <= -1)\n"
" return -1;\n"
" return fd;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void ifelse23() { // #5473
check("void f() {\n"
" if (FILE* fp = fopen(\"x\", \"r\")) {}\n"
"}\n");
ASSERT_EQUALS("[test.c:2]: (error) Resource leak: fp\n", errout.str());
}
void ifelse24() { // #1733
const Settings s = settingsBuilder().library("std.cfg").library("posix.cfg").build();
check("void f() {\n"
" char* temp = strdup(\"temp.txt\");\n"
" FILE* fp;\n"
" if (NULL == x || NULL == (fp = fopen(temp, \"rt\")))\n"
" return;\n"
"}\n", s);
ASSERT_EQUALS("[test.cpp:5]: (error) Memory leak: temp\n"
"[test.cpp:6]: (error) Memory leak: temp\n"
"[test.cpp:6]: (error) Resource leak: fp\n",
errout.str());
check("FILE* f() {\n"
" char* temp = strdup(\"temp.txt\");\n"
" FILE* fp = fopen(temp, \"rt\");\n"
" return fp;\n"
"}\n", s);
ASSERT_EQUALS("[test.cpp:4]: (error) Memory leak: temp\n", errout.str());
check("FILE* f() {\n"
" char* temp = strdup(\"temp.txt\");\n"
" FILE* fp = NULL;\n"
" fopen_s(&fp, temp, \"rt\");\n"
" return fp;\n"
"}\n", s);
ASSERT_EQUALS("[test.cpp:5]: (error) Memory leak: temp\n", errout.str());
check("void f() {\n"
" char* temp = strdup(\"temp.txt\");\n"
" FILE* fp = fopen(\"a.txt\", \"rb\");\n"
" if (fp)\n"
" freopen(temp, \"rt\", fp);\n"
"}\n", s);
ASSERT_EQUALS("[test.cpp:6]: (error) Memory leak: temp\n"
"[test.cpp:6]: (error) Resource leak: fp\n",
errout.str());
check("FILE* f() {\n"
" char* temp = strdup(\"temp.txt\");\n"
" return fopen(temp, \"rt\");\n"
"}\n", s);
TODO_ASSERT_EQUALS("[test.cpp:3]: (error) Memory leak: temp\n", "", errout.str());
}
void ifelse25() { // #9966
check("void f() {\n"
" void *p, *p2;\n"
" if((p2 = p = malloc(10)) == NULL)\n"
" return;\n"
" (void)p;\n"
" free(p2);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void ifelse26() { // don't crash
check("union tidi {\n"
" long long ti;\n"
" unsigned int di[2];\n"
"};\n"
"void f(long long val) {\n"
" if (val == ({ union tidi d = {.di = {0x0, 0x80000000}}; d.ti; })) {}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void ifelse27() {
check("struct key { void* p; };\n"
"int f(struct key** handle) {\n"
" struct key* key;\n"
" if (!(key = calloc(1, sizeof(*key))))\n"
" return 0;\n"
" if (!(key->p = malloc(4))) {\n"
" free(key);\n"
" return 0;\n"
" }\n"
" *handle = key;\n"
" return 1;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void ifelse28() { // #11038
check("char * f(void) {\n"
" char *buf = (char*)malloc(42*sizeof(char));\n"
" char *temp;\n"
" if ((temp = (char*)realloc(buf, 16)) != NULL)\n"
" { buf = temp; }\n"
" return buf;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void switch1() {
check("void f() {\n"
" char *p = 0;\n"
" switch (x) {\n"
" case 123: p = malloc(100); break;\n"
" default: return;\n"
" }\n"
" free(p);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void loop1() {
// test the handling of { }
check("void f() {\n"
" char *p;\n"
" for (i=0;i<5;i++) { }\n"
" if (x) { free(p) }\n"
" else { a = p; }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void loop2() {
check("void f() {\n" // #11786
" int* p = (int*)malloc(sizeof(int));\n"
" if (1) {\n"
" while (0) {}\n"
" free(p);\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(node **p) {\n"
" node* n = *p;\n"
" if (n->left == NULL) {\n"
" *p = n->right;\n"
" free(n);\n"
" }\n"
" else if (n->right == NULL) {\n"
" *p = n->left;\n"
" free(n);\n"
" }\n"
" else {\n"
" for (int i = 0; i < 4; ++i) {}\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void mismatchAllocDealloc() {
check("void f() {\n"
" FILE*f=fopen(fname,a);\n"
" free(f);\n"
"}");
ASSERT_EQUALS("[test.c:2] -> [test.c:3]: (error) Mismatching allocation and deallocation: f\n", errout.str());
check("void f() {\n"
" FILE*f=fopen(fname,a);\n"
" free((void*)f);\n"
"}");
ASSERT_EQUALS("[test.c:2] -> [test.c:3]: (error) Mismatching allocation and deallocation: f\n", errout.str());
check("void f() {\n"
" char *cPtr = new char[100];\n"
" delete[] cPtr;\n"
" cPtr = new char[100]('x');\n"
" delete[] cPtr;\n"
" cPtr = new char[100];\n"
" delete cPtr;\n"
"}", true);
ASSERT_EQUALS("[test.cpp:6] -> [test.cpp:7]: (error) Mismatching allocation and deallocation: cPtr\n", errout.str());
check("void f() {\n"
" char *cPtr = new char[100];\n"
" free(cPtr);\n"
"}", true);
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (error) Mismatching allocation and deallocation: cPtr\n", errout.str());
check("void f() {\n"
" char *cPtr = new (buf) char[100];\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int * i = new int[1];\n"
" std::unique_ptr<int> x(i);\n"
"}\n", true);
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (error) Mismatching allocation and deallocation: i\n", errout.str());
check("void f() {\n"
" int * i = new int;\n"
" std::unique_ptr<int[]> x(i);\n"
"}\n", true);
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (error) Mismatching allocation and deallocation: i\n", errout.str());
check("void f() {\n"
" void* a = malloc(1);\n"
" void* b = freopen(f, p, a);\n"
" free(b);\n"
"}");
ASSERT_EQUALS("[test.c:2] -> [test.c:3]: (error) Mismatching allocation and deallocation: a\n"
"[test.c:3] -> [test.c:4]: (error) Mismatching allocation and deallocation: b\n", errout.str());
check("void f() {\n"
" void* a;\n"
" void* b = realloc(a, 10);\n"
" free(b);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int * i = new int;\n"
" int * j = realloc(i, 2 * sizeof(int));\n"
" delete[] j;\n"
"}", true);
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (error) Mismatching allocation and deallocation: i\n"
"[test.cpp:3] -> [test.cpp:4]: (error) Mismatching allocation and deallocation: j\n", errout.str());
check("static void deleter(int* p) { free(p); }\n" // #11392
"void f() {\n"
" if (int* p = static_cast<int*>(malloc(4))) {\n"
" std::unique_ptr<int, decltype(&deleter)> guard(p, &deleter);\n"
" }\n"
"}\n", true);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" if (int* p = static_cast<int*>(malloc(4))) {\n"
" std::unique_ptr<int, decltype(&deleter)> guard(p, &deleter);\n"
" }\n"
"}\n", true);
ASSERT_EQUALS("", errout.str());
check("void f(int i) {\n"
" int* a = new int[i] {};\n"
" delete[] a;\n"
"}\n", /*cpp*/ true);
ASSERT_EQUALS("", errout.str());
}
void smartPointerDeleter() {
check("void f() {\n"
" FILE*f=fopen(fname,a);\n"
" std::unique_ptr<FILE> fp{f};\n"
"}", true);
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (error) Mismatching allocation and deallocation: f\n", errout.str());
check("void f() {\n"
" FILE*f=fopen(fname,a);\n"
" std::unique_ptr<FILE, decltype(&fclose)> fp{f, &fclose};\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" FILE*f=fopen(fname,a);\n"
" std::shared_ptr<FILE> fp{f, &fclose};\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check("struct deleter { void operator()(FILE* f) { fclose(f); }};\n"
"void f() {\n"
" FILE*f=fopen(fname,a);\n"
" std::unique_ptr<FILE, deleter> fp{f};\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check("int * create();\n"
"void destroy(int * x);\n"
"void f() {\n"
" int x * = create()\n"
" std::unique_ptr<int, decltype(&destroy)> xp{x, &destroy()};\n"
"}\n", true);
ASSERT_EQUALS("", errout.str());
check("int * create();\n"
"void destroy(int * x);\n"
"void f() {\n"
" int x * = create()\n"
" std::unique_ptr<int, decltype(&destroy)> xp(x, &destroy());\n"
"}\n", true);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" FILE*f=fopen(fname,a);\n"
" std::shared_ptr<FILE> fp{f, [](FILE* x) { fclose(x); }};\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" FILE*f=fopen(fname,a);\n"
" std::shared_ptr<FILE> fp{f, +[](FILE* x) { fclose(x); }};\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" FILE*f=fopen(fname,a);\n"
" std::shared_ptr<FILE> fp{f, [](FILE* x) { free(f); }};\n"
"}", true);
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (error) Mismatching allocation and deallocation: f\n", errout.str());
check("void f() {\n"
" FILE*f=fopen(fname,a);\n"
" std::shared_ptr<FILE> fp{f, [](FILE* x) {}};\n"
"}", true);
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (error) Mismatching allocation and deallocation: f\n", errout.str());
check("class C;\n"
"void f() {\n"
" C* c = new C{};\n"
" std::shared_ptr<C> a{c, [](C*) {}};\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check("class C;\n"
"void f() {\n"
" C* c = new C{};\n"
" std::shared_ptr<C> a{c, [](C* x) { delete x; }};\n"
"}", true);
ASSERT_EQUALS("", errout.str());
}
void smartPointerRelease() {
check("void f() {\n"
" int * i = new int;\n"
" std::unique_ptr<int> x(i);\n"
" x.release();\n"
" delete i;\n"
"}\n", true);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int * i = new int;\n"
" std::unique_ptr<int> x(i);\n"
" x.release();\n"
"}\n", true);
ASSERT_EQUALS("[test.cpp:5]: (error) Memory leak: i\n", errout.str());
}
void return1() {
check("int f() {\n"
" char *p = malloc(100);\n"
" return 123;\n"
"}");
ASSERT_EQUALS("[test.c:3]: (error) Memory leak: p\n", errout.str());
}
void return2() {
check("char *f() {\n"
" char *p = malloc(100);\n"
" return p;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void return3() {
check("struct dev * f() {\n"
" struct ABC *abc = malloc(100);\n"
" return &abc->dev;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void return4() { // ticket #3862
// avoid false positives
check("void f(char *p, int x) {\n"
" if (x==12) {\n"
" free(p);\n"
" throw 1;\n"
" }\n"
" free(p);\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check("void f(char *p, int x) {\n"
" if (x==12) {\n"
" delete p;\n"
" throw 1;\n"
" }\n"
" delete p;\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check("void f(char *p, int x) {\n"
" if (x==12) {\n"
" delete [] p;\n"
" throw 1;\n"
" }\n"
" delete [] p;\n"
"}", true);
ASSERT_EQUALS("", errout.str());
}
void return5() { // ticket #6397 - conditional allocation/deallocation and conditional return
// avoid false positives
check("void f(int *p, int x) {\n"
" if (x != 0) {\n"
" free(p);\n"
" }\n"
" if (x != 0) {\n"
" return;\n"
" }\n"
" *p = 0;\n"
"}", true);
ASSERT_EQUALS("", errout.str());
}
void return6() { // #8282
check("std::pair<char*, char*> f(size_t n) {\n"
" char* p = (char* )malloc(n);\n"
" return {p, p};\n"
"}", true);
ASSERT_EQUALS("", errout.str());
}
void return7() { // #9343
check("uint8_t *f() {\n"
" void *x = malloc(1);\n"
" return (uint8_t *)x;\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check("uint8_t f() {\n"
" void *x = malloc(1);\n"
" return (uint8_t)x;\n"
"}", true);
ASSERT_EQUALS("[test.cpp:3]: (error) Memory leak: x\n", errout.str());
check("void** f() {\n"
" void *x = malloc(1);\n"
" return (void**)x;\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check("void* f() {\n"
" void *x = malloc(1);\n"
" return (long long)x;\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check("void* f() {\n"
" void *x = malloc(1);\n"
" return (void*)(short)x;\n"
"}", true);
ASSERT_EQUALS("[test.cpp:3]: (error) Memory leak: x\n", errout.str());
check("void* f() {\n"
" void *x = malloc(1);\n"
" return (mytype)x;\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check("void* f() {\n" // Do not crash
" void *x = malloc(1);\n"
" return (mytype)y;\n"
"}", true);
ASSERT_EQUALS("[test.cpp:3]: (error) Memory leak: x\n", errout.str());
}
void return8() {
check("void* f() {\n"
" void *x = malloc(1);\n"
" return (x);\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check("void* f() {\n"
" void *x = malloc(1);\n"
" return ((x));\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check("void* f() {\n"
" void *x = malloc(1);\n"
" return ((((x))));\n"
"}", true);
ASSERT_EQUALS("", errout.str());
check("char* f() {\n"
" void *x = malloc(1);\n"
" return (char*)(x);\n"
"}", true);
ASSERT_EQUALS("", errout.str());
}
void return9() {
check("void* f() {\n"
" void *x = malloc (sizeof (struct alloc));\n"
" return x + sizeof (struct alloc);\n"
"}", true);
ASSERT_EQUALS("", errout.str());
}
void return10() {
check("char f() {\n" // #11758
" char* p = (char*)malloc(1);\n"
" p[0] = 'x';\n"
" return p[0];\n"
"}");
ASSERT_EQUALS("[test.c:4]: (error) Memory leak: p\n", errout.str());
check("struct S { int f(); };\n" // #11746
"int g() {\n"
" S* s = new S;\n"
" delete s;\n"
" return s->f();\n"
"}", true);
ASSERT_EQUALS("[test.cpp:4] -> [test.cpp:5]: (error) Returning/dereferencing 's' after it is deallocated / released\n", errout.str());
check("int f() {\n"
" int* p = new int(3);\n"
" delete p;\n"
" return *p;\n"
"}", true);
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (error) Returning/dereferencing 'p' after it is deallocated / released\n", errout.str());
}
void test1() {
check("void f(double*&p) {\n" // 3809
" p = malloc(0x100);\n"
"}", /*cpp*/ true);
ASSERT_EQUALS("", errout.str());
check("void f(int*& p) {\n" // #4400
" p = (int*)malloc(4);\n"
" p = (int*)malloc(4);\n"
"}\n", /*cpp*/ true);
ASSERT_EQUALS("[test.cpp:3]: (error) Memory leak: p\n", errout.str());
check("void f() {\n"
" int* p = (int*)malloc(4);\n"
" int*& r = p;\n"
" r = (int*)malloc(4);\n"
"}\n", /*cpp*/ true);
TODO_ASSERT_EQUALS("[test.cpp:4]: (error) Memory leak: p\n", "", errout.str());
check("void f() {\n"
" int* p = (int*)malloc(4);\n"
" int*& r = p;\n"
" free(r);\n"
" p = (int*)malloc(4);\n"
"}\n", /*cpp*/ true);
TODO_ASSERT_EQUALS("", "[test.cpp:6]: (error) Memory leak: p\n", errout.str());
}
void test2() { // 3899
check("struct Fred {\n"
" char *p;\n"
" void f1() { free(p); }\n"
"};");
ASSERT_EQUALS("", errout.str());
}
void test3() { // 3954 - reference pointer
check("void f() {\n"
" char *&p = x();\n"
" p = malloc(10);\n"
"};", /*cpp*/ true);
ASSERT_EQUALS("", errout.str());
}
void test4() { // 5923 - static pointer
check("void f() {\n"
" static char *p;\n"
" if (!p) p = malloc(10);\n"
" if (x) { free(p); p = 0; }\n"
"};");
ASSERT_EQUALS("", errout.str());
}
void test5() { // unknown type
check("void f() { Fred *p = malloc(10); }", true);
ASSERT_EQUALS("[test.cpp:1]: (error) Memory leak: p\n", errout.str());
check("void f() { Fred *p = malloc(10); }", false);
ASSERT_EQUALS("[test.c:1]: (error) Memory leak: p\n", errout.str());
check("void f() { Fred *p = new Fred; }", true);
ASSERT_EQUALS("", errout.str());
check("void f() { Fred fred = malloc(10); }", true);
ASSERT_EQUALS("", errout.str());
}
void throw1() { // 3987 - Execution reach a 'throw'
check("void f() {\n"
" char *p = malloc(10);\n"
" throw 123;\n"
"}", true);
ASSERT_EQUALS("[test.cpp:3]: (error) Memory leak: p\n", errout.str());
check("void f() {\n"
" char *p;\n"
" try {\n"
" p = malloc(10);\n"
" throw 123;\n"
" } catch (...) { }\n"
" free(p);\n"
"}", true);
ASSERT_EQUALS("", errout.str());
}
void throw2() { // do not miss ::NS::Except()
check("namespace NS {\n"
" class Except {\n"
" };\n"
"}\n"
"void foo(int i)\n"
"{\n"
" int *pi = new int;\n"
" if (i == 42) {\n"
" delete pi;\n"
" throw ::NS::Except();\n"
" }\n"
" delete pi;\n"
"}", true);
ASSERT_EQUALS("", errout.str());
}
void configuration1() {
// Possible leak => configuration is required for complete analysis
// The user should be able to "white list" and "black list" functions.
// possible leak. If the function 'x' deallocates the pointer or
// takes the address, there is no leak.
check("void f() {\n"
" char *p = malloc(10);\n"
" x(p);\n"
"}");
ASSERT_EQUALS("[test.c:3]: (information) --check-library: Function x() should have <noreturn> configuration\n"
"[test.c:4]: (information) --check-library: Function x() should have <use>/<leak-ignore> configuration\n",
errout.str());
check("void cb();\n" // #11190, #11523
"void f() {\n"
" cb();\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void configuration2() {
// possible leak. If the function 'x' deallocates the pointer or
// takes the address, there is no leak.
check("void f() {\n"
" char *p = malloc(10);\n"
" x(&p);\n"
"}");
ASSERT_EQUALS("[test.c:3]: (information) --check-library: Function x() should have <noreturn> configuration\n"
"[test.c:4]: (information) --check-library: Function x() should have <use>/<leak-ignore> configuration\n",
errout.str());
}
void configuration3() {
const char * code = "void f() {\n"
" char *p = malloc(10);\n"
" if (set_data(p)) { }\n"
"}";
check(code);
ASSERT_EQUALS("[test.c:4]: (information) --check-library: Function set_data() should have <use>/<leak-ignore> configuration\n", errout.str());
check(code, true);
ASSERT_EQUALS("[test.cpp:4]: (information) --check-library: Function set_data() should have <use>/<leak-ignore> configuration\n", errout.str());
code = "void f() {\n"
" char *p = malloc(10);\n"
" if (set_data(p)) { return; }\n"
"}";
check(code);
ASSERT_EQUALS("[test.c:3]: (information) --check-library: Function set_data() should have <use>/<leak-ignore> configuration\n"
"[test.c:4]: (information) --check-library: Function set_data() should have <use>/<leak-ignore> configuration\n"
, errout.str());
check(code, true);
ASSERT_EQUALS("[test.cpp:3]: (information) --check-library: Function set_data() should have <use>/<leak-ignore> configuration\n"
"[test.cpp:4]: (information) --check-library: Function set_data() should have <use>/<leak-ignore> configuration\n"
, errout.str());
}
void configuration4() {
check("void f() {\n"
" char *p = malloc(10);\n"
" int ret = set_data(p);\n"
" return ret;\n"
"}");
ASSERT_EQUALS("[test.c:4]: (information) --check-library: Function set_data() should have <use>/<leak-ignore> configuration\n", errout.str());
}
void configuration5() {
check("void f() {\n"
" int(i);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" static_assert(1 == sizeof(char), \"test\");\n"
"}\n", /*cpp*/ true);
ASSERT_EQUALS("", errout.str());
check("namespace pal {\n" // #11237
" struct AutoTimer {};\n"
"}\n"
"int main() {\n"
" pal::AutoTimer();\n"
"}\n", /*cpp*/ true);
ASSERT_EQUALS("", errout.str());
check("struct AutoTimer {};\n"
"int main() {\n"
" AutoTimer();\n"
"}\n", /*cpp*/ true);
ASSERT_EQUALS("", errout.str());
check("void f() {\n" // #8666
" asm(\"assembler code\");\n"
" asm volatile(\"assembler code\");\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f() {\n" // #11239
" asm goto(\"assembler code\");\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" FILE* p = fopen(\"abc.txt\", \"r\");\n"
" if (fclose(p) != 0) {}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("struct S;\n"
"void f(int a, int b, S*& p) {\n"
" if (a == -1) {\n"
" FILE* file = fopen(\"abc.txt\", \"r\");\n"
" }\n"
" if (b) {\n"
" void* buf = malloc(10);\n"
" p = reinterpret_cast<S*>(buf);\n"
" }\n"
"}\n", /*cpp*/ true);
ASSERT_EQUALS("[test.cpp:5]: (error) Resource leak: file\n", errout.str());
}
void configuration6() {
check("void f() {}\n" // #11198
"void g() {\n"
" f();\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(std::function<void()> cb) {\n" // #11189
" cb();\n"
"}\n"
"void g(void (*cb)()) {\n"
" cb();\n"
"}\n", /*cpp*/ true);
ASSERT_EQUALS("", errout.str());
}
void ptrptr() {
check("void f() {\n"
" char **p = malloc(10);\n"
"}");
ASSERT_EQUALS("[test.c:3]: (error) Memory leak: p\n", errout.str());
}
void nestedAllocation() {
check("void QueueDSMCCPacket(unsigned char *data, int length) {\n"
" unsigned char *dataCopy = malloc(length * sizeof(unsigned char));\n"
" m_dsmccQueue.enqueue(new DSMCCPacket(dataCopy));\n"
"}", true);
ASSERT_EQUALS("[test.cpp:4]: (information) --check-library: Function DSMCCPacket() should have <use>/<leak-ignore> configuration\n", errout.str());
check("void QueueDSMCCPacket(unsigned char *data, int length) {\n"
" unsigned char *dataCopy = malloc(length * sizeof(unsigned char));\n"
" m_dsmccQueue.enqueue(new DSMCCPacket(somethingunrelated));\n"
"}", true);
ASSERT_EQUALS("[test.cpp:4]: (error) Memory leak: dataCopy\n", errout.str());
check("void f() {\n"
" char *buf = new char[1000];\n"
" clist.push_back(new (std::nothrow) C(buf));\n"
"}", true);
ASSERT_EQUALS("[test.cpp:4]: (information) --check-library: Function C() should have <use>/<leak-ignore> configuration\n", errout.str());
}
void testKeywords() {
check("int main(int argc, char **argv) {\n"
" double *new = malloc(1*sizeof(double));\n"
" free(new);\n"
" return 0;\n"
"}", false);
ASSERT_EQUALS("", errout.str());
}
void inlineFunction() {
check("int test() {\n"
" char *c;\n"
" int ret() {\n"
" free(c);\n"
" return 0;\n"
" }\n"
" c = malloc(128);\n"
" return ret();\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// #8262
void smartPtrInContainer() {
check("std::list< std::shared_ptr<int> > mList;\n"
"void test(){\n"
" int *pt = new int(1);\n"
" mList.push_back(std::shared_ptr<int>(pt));\n"
"}\n",
true
);
ASSERT_EQUALS("", errout.str());
}
void functionCallCastConfig() { // #9652
constexpr char xmldata[] = "<?xml version=\"1.0\"?>\n"
"<def format=\"2\">\n"
" <function name=\"free_func\">\n"
" <noreturn>false</noreturn>\n"
" <arg nr=\"1\">\n"
" <not-uninit/>\n"
" </arg>\n"
" <arg nr=\"2\">\n"
" <not-uninit/>\n"
" </arg>\n"
" </function>\n"
"</def>";
const Settings settingsFunctionCall = settingsBuilder(settings).libraryxml(xmldata, sizeof(xmldata)).build();
check("void test_func()\n"
"{\n"
" char * buf = malloc(4);\n"
" free_func((void *)(1), buf);\n"
"}", settingsFunctionCall);
ASSERT_EQUALS("[test.cpp:5]: (information) --check-library: Function free_func() should have <use>/<leak-ignore> configuration\n", errout.str());
check("void g(void*);\n"
"void h(int, void*);\n"
"void f1() {\n"
" int* p = new int;\n"
" g(static_cast<void*>(p));\n"
"}\n"
"void f2() {\n"
" int* p = new int;\n"
" h(1, static_cast<void*>(p));\n"
"}\n", /*cpp*/ true);
ASSERT_EQUALS("[test.cpp:6]: (information) --check-library: Function g() should have <use>/<leak-ignore> configuration\n"
"[test.cpp:10]: (information) --check-library: Function h() should have <use>/<leak-ignore> configuration\n",
errout.str());
}
void functionCallLeakIgnoreConfig() { // #7923
constexpr char xmldata[] = "<?xml version=\"1.0\"?>\n"
"<def format=\"2\">\n"
" <function name=\"SomeClass::someMethod\">\n"
" <leak-ignore/>\n"
" <noreturn>false</noreturn>\n"
" <arg nr=\"1\" direction=\"in\"/>\n"
" </function>\n"
"</def>\n";
const Settings settingsLeakIgnore = settingsBuilder().libraryxml(xmldata, sizeof(xmldata)).build();
check("void f() {\n"
" double* a = new double[1024];\n"
" SomeClass::someMethod(a);\n"
"}\n", settingsLeakIgnore);
ASSERT_EQUALS("[test.cpp:4]: (error) Memory leak: a\n", errout.str());
check("void bar(int* p) {\n"
" if (p)\n"
" free(p);\n"
"}\n"
"void f() {\n"
" int* p = malloc(4);\n"
" bar(p);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
};
REGISTER_TEST(TestLeakAutoVar)
class TestLeakAutoVarRecursiveCountLimit : public TestFixture {
public:
TestLeakAutoVarRecursiveCountLimit() : TestFixture("TestLeakAutoVarRecursiveCountLimit") {}
private:
const Settings settings = settingsBuilder().library("std.cfg").checkLibrary().build();
#define checkP(...) checkP_(__FILE__, __LINE__, __VA_ARGS__)
void checkP_(const char* file, int line, const char code[], bool cpp = false) {
// Clear the error buffer..
errout.str("");
std::vector<std::string> files(1, cpp?"test.cpp":"test.c");
Tokenizer tokenizer(&settings, this);
PreprocessorHelper::preprocess(code, files, tokenizer);
// Tokenizer..
ASSERT_LOC(tokenizer.simplifyTokens1(""), file, line);
// Check for leaks..
runChecks<CheckLeakAutoVar>(tokenizer, this);
}
void run() override {
TEST_CASE(recursiveCountLimit); // #5872 #6157 #9097
}
void recursiveCountLimit() { // #5872 #6157 #9097
ASSERT_THROW(checkP("#define ONE else if (0) { }\n"
"#define TEN ONE ONE ONE ONE ONE ONE ONE ONE ONE ONE\n"
"#define HUN TEN TEN TEN TEN TEN TEN TEN TEN TEN TEN\n"
"#define THOU HUN HUN HUN HUN HUN HUN HUN HUN HUN HUN\n"
"void foo() {\n"
" if (0) { }\n"
" THOU THOU\n"
"}"), InternalError);
ASSERT_NO_THROW(checkP("#define ONE if (0) { }\n"
"#define TEN ONE ONE ONE ONE ONE ONE ONE ONE ONE ONE\n"
"#define HUN TEN TEN TEN TEN TEN TEN TEN TEN TEN TEN\n"
"#define THOU HUN HUN HUN HUN HUN HUN HUN HUN HUN HUN\n"
"void foo() {\n"
" if (0) { }\n"
" THOU THOU\n"
"}"));
}
};
#if !defined(__MINGW32__)
// TODO: this crashes with a stack overflow for MinGW in the CI
REGISTER_TEST(TestLeakAutoVarRecursiveCountLimit)
#endif
class TestLeakAutoVarStrcpy : public TestFixture {
public:
TestLeakAutoVarStrcpy() : TestFixture("TestLeakAutoVarStrcpy") {}
private:
const Settings settings = settingsBuilder().library("std.cfg").checkLibrary().build();
void check_(const char* file, int line, const char code[]) {
// Clear the error buffer..
errout.str("");
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
ASSERT_LOC(tokenizer.tokenize(istr, "test.cpp"), file, line);
// Check for leaks..
runChecks<CheckLeakAutoVar>(tokenizer, this);
}
void run() override {
TEST_CASE(returnedValue); // #9298
TEST_CASE(deallocuse2);
TEST_CASE(fclose_false_positive); // #9575
TEST_CASE(strcpy_false_negative);
}
void returnedValue() { // #9298
check("char *m;\n"
"void strcpy_returnedvalue(const char* str)\n"
"{\n"
" char* ptr = new char[strlen(str)+1];\n"
" m = strcpy(ptr, str);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void deallocuse2() {
check("void f(char *p) {\n"
" free(p);\n"
" strcpy(a, p);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Dereferencing 'p' after it is deallocated / released\n", errout.str());
check("void f(char *p, const char *q) {\n" // #11665
" free(p);\n"
" strcpy(p, q);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Dereferencing 'p' after it is deallocated / released\n",
errout.str());
check("void f(char *p) {\n" // #3041 - assigning pointer when it's used
" free(p);\n"
" strcpy(a, p=b());\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void fclose_false_positive() { // #9575
check("int f(FILE *fp) { return fclose(fp); }");
ASSERT_EQUALS("", errout.str());
}
void strcpy_false_negative() { // #12289
check("void f() {\n"
" char* buf = new char[12];\n"
" strcpy(buf, \"123\");\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Memory leak: buf\n", errout.str());
}
};
REGISTER_TEST(TestLeakAutoVarStrcpy)
class TestLeakAutoVarWindows : public TestFixture {
public:
TestLeakAutoVarWindows() : TestFixture("TestLeakAutoVarWindows") {}
private:
const Settings settings = settingsBuilder().library("windows.cfg").build();
void check_(const char* file, int line, const char code[]) {
// Clear the error buffer..
errout.str("");
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
ASSERT_LOC(tokenizer.tokenize(istr, "test.c"), file, line);
// Check for leaks..
runChecks<CheckLeakAutoVar>(tokenizer, this);
}
void run() override {
TEST_CASE(heapDoubleFree);
}
void heapDoubleFree() {
check("void f() {"
" HANDLE MyHeap = HeapCreate(0, 0, 0);"
" int *a = HeapAlloc(MyHeap, 0, sizeof(int));"
" int *b = HeapAlloc(MyHeap, 0, sizeof(int));"
" HeapFree(MyHeap, 0, a);"
" HeapFree(MyHeap, 0, b);"
" HeapDestroy(MyHeap);"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {"
" int *a = HeapAlloc(GetProcessHeap(), 0, sizeof(int));"
" int *b = HeapAlloc(GetProcessHeap(), 0, sizeof(int));"
" HeapFree(GetProcessHeap(), 0, a);"
" HeapFree(GetProcessHeap(), 0, b);"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {"
" HANDLE MyHeap = HeapCreate(0, 0, 0);"
" int *a = HeapAlloc(MyHeap, 0, sizeof(int));"
" int *b = HeapAlloc(MyHeap, 0, sizeof(int));"
" HeapFree(MyHeap, 0, a);"
" HeapDestroy(MyHeap);"
"}");
ASSERT_EQUALS("[test.c:1]: (error) Memory leak: b\n", errout.str());
check("void f() {"
" HANDLE MyHeap = HeapCreate(0, 0, 0);"
" int *a = HeapAlloc(MyHeap, 0, sizeof(int));"
" int *b = HeapAlloc(MyHeap, 0, sizeof(int));"
" HeapFree(MyHeap, 0, a);"
" HeapFree(MyHeap, 0, b);"
"}");
ASSERT_EQUALS("[test.c:1]: (error) Resource leak: MyHeap\n", errout.str());
check("void f() {"
" HANDLE MyHeap = HeapCreate(0, 0, 0);"
" int *a = HeapAlloc(MyHeap, 0, sizeof(int));"
" int *b = HeapAlloc(MyHeap, 0, sizeof(int));"
" HeapFree(MyHeap, 0, a);"
"}");
ASSERT_EQUALS("[test.c:1]: (error) Resource leak: MyHeap\n"
"[test.c:1]: (error) Memory leak: b\n",
errout.str());
}
};
REGISTER_TEST(TestLeakAutoVarWindows)
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