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cppcheck/test/testmemleak.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2020 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 "checkmemoryleak.h"
#include "config.h"
#include "settings.h"
#include "symboldatabase.h"
#include "testsuite.h"
#include "token.h"
#include "tokenize.h"
#include <list>
#include <ostream>
#include <string>
class TestMemleak : private TestFixture {
public:
TestMemleak() : TestFixture("TestMemleak") {
}
private:
Settings settings;
void run() OVERRIDE {
TEST_CASE(testFunctionReturnType);
TEST_CASE(open);
}
CheckMemoryLeak::AllocType functionReturnType(const char code[]) {
// Clear the error buffer..
errout.str("");
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
const CheckMemoryLeak c(&tokenizer, this, &settings);
return c.functionReturnType(&tokenizer.getSymbolDatabase()->scopeList.front().functionList.front());
}
void testFunctionReturnType() {
{
const char code[] = "const char *foo()\n"
"{ return 0; }";
ASSERT_EQUALS(CheckMemoryLeak::No, functionReturnType(code));
}
{
const char code[] = "Fred *newFred()\n"
"{ return new Fred; }";
ASSERT_EQUALS(CheckMemoryLeak::New, functionReturnType(code));
}
{
const char code[] = "char *foo()\n"
"{ return new char[100]; }";
ASSERT_EQUALS(CheckMemoryLeak::NewArray, functionReturnType(code));
}
{
const char code[] = "char *foo()\n"
"{\n"
" char *p = new char[100];\n"
" return p;\n"
"}";
ASSERT_EQUALS(CheckMemoryLeak::NewArray, functionReturnType(code));
}
}
void open() {
const char code[] = "class A {\n"
" static int open() {\n"
" return 1;\n"
" }\n"
"\n"
" A() {\n"
" int ret = open();\n"
" }\n"
"};\n";
// Clear the error buffer..
errout.str("");
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
// there is no allocation
const Token *tok = Token::findsimplematch(tokenizer.tokens(), "ret =");
const CheckMemoryLeak check(&tokenizer, nullptr, &settings);
ASSERT_EQUALS(CheckMemoryLeak::No, check.getAllocationType(tok->tokAt(2), 1));
}
};
REGISTER_TEST(TestMemleak)
class TestMemleakInFunction : public TestFixture {
public:
TestMemleakInFunction() : TestFixture("TestMemleakInFunction") {
}
private:
Settings settings0;
Settings settings1;
Settings settings2;
void check(const char code[]) {
// Clear the error buffer..
errout.str("");
Settings *settings = &settings1;
// Tokenize..
Tokenizer tokenizer(settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
// Check for memory leaks..
CheckMemoryLeakInFunction checkMemoryLeak(&tokenizer, settings, this);
checkMemoryLeak.checkReallocUsage();
}
void run() OVERRIDE {
LOAD_LIB_2(settings1.library, "std.cfg");
LOAD_LIB_2(settings1.library, "posix.cfg");
LOAD_LIB_2(settings2.library, "std.cfg");
TEST_CASE(realloc1);
TEST_CASE(realloc2);
TEST_CASE(realloc3);
TEST_CASE(realloc4);
TEST_CASE(realloc5);
TEST_CASE(realloc7);
TEST_CASE(realloc8);
TEST_CASE(realloc9);
TEST_CASE(realloc10);
TEST_CASE(realloc11);
TEST_CASE(realloc12);
TEST_CASE(realloc13);
TEST_CASE(realloc14);
TEST_CASE(realloc15);
TEST_CASE(realloc16);
TEST_CASE(realloc17);
TEST_CASE(realloc18);
TEST_CASE(realloc19);
TEST_CASE(realloc20);
TEST_CASE(realloc21);
TEST_CASE(realloc22);
TEST_CASE(realloc23);
TEST_CASE(realloc24); // #9228
TEST_CASE(reallocarray1);
}
void realloc1() {
check("void foo()\n"
"{\n"
" char *a = (char *)malloc(10);\n"
" a = realloc(a, 100);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Common realloc mistake: \'a\' nulled but not freed upon failure\n", errout.str());
}
void realloc2() {
check("void foo()\n"
"{\n"
" char *a = (char *)malloc(10);\n"
" a = (char *)realloc(a, 100);\n"
" free(a);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Common realloc mistake: \'a\' nulled but not freed upon failure\n", errout.str());
}
void realloc3() {
check("void foo()\n"
"{\n"
" char *a = 0;\n"
" if ((a = realloc(a, 100)) == NULL)\n"
" return;\n"
" free(a);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void realloc4() {
check("void foo()\n"
"{\n"
" static char *a = 0;\n"
" if ((a = realloc(a, 100)) == NULL)\n"
" return;\n"
" free(a);\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:5]: (error) Memory leak: a\n",
"[test.cpp:4]: (error) Common realloc mistake: \'a\' nulled but not freed upon failure\n",
errout.str());
}
void realloc5() {
check("void foo()\n"
"{\n"
" char *buf;\n"
" char *new_buf;\n"
" buf = calloc( 10 );\n"
" new_buf = realloc ( buf, 20);\n"
" if ( !new_buf )\n"
" free(buf);\n"
" else\n"
" free(new_buf);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void realloc7() {
check("bool foo(size_t nLen, char* pData)\n"
"{\n"
" pData = (char*) realloc(pData, sizeof(char) + (nLen + 1)*sizeof(char));\n"
" if ( pData == NULL )\n"
" {\n"
" return false;\n"
" }\n"
" free(pData);\n"
" return true;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void realloc8() {
check("void foo()\n"
"{\n"
" char *origBuf = m_buf;\n"
" m_buf = (char *) realloc (m_buf, m_capacity + growBy);\n"
" if (!m_buf) {\n"
" m_buf = origBuf;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void realloc9() {
check("void foo()\n"
"{\n"
" x = realloc(x,100);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void realloc10() {
check("void foo() {\n"
" char *pa, *pb;\n"
" pa = pb = malloc(10);\n"
" pa = realloc(pa, 20);"
" exit();\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void realloc11() {
check("void foo() {\n"
" char *p;\n"
" p = realloc(p, size);\n"
" if (!p)\n"
" error();\n"
" usep(p);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void realloc12() {
check("void foo(int x)\n"
"{\n"
" char *a = 0;\n"
" if ((a = realloc(a, x + 100)) == NULL)\n"
" return;\n"
" free(a);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void realloc13() {
check("void foo()\n"
"{\n"
" char **str;\n"
" *str = realloc(*str,100);\n"
" free (*str);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Common realloc mistake: \'str\' nulled but not freed upon failure\n", errout.str());
}
void realloc14() {
check("void foo() {\n"
" char *p;\n"
" p = realloc(p, size + 1);\n"
" if (!p)\n"
" error();\n"
" usep(p);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void realloc15() {
check("bool foo() {\n"
" char ** m_options;\n"
" m_options = (char**)realloc( m_options, 2 * sizeof(char*));\n"
" if( m_options == NULL )\n"
" return false;\n"
" return true;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Common realloc mistake: \'m_options\' nulled but not freed upon failure\n", errout.str());
}
void realloc16() {
check("void f(char *zLine) {\n"
" zLine = realloc(zLine, 42);\n"
" if (zLine) {\n"
" free(zLine);\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void realloc17() {
check("void foo()\n"
"{\n"
" void ***a = malloc(sizeof(a));\n"
" ***a = realloc(***(a), sizeof(a) * 2);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Common realloc mistake: \'a\' nulled but not freed upon failure\n", errout.str());
}
void realloc18() {
check("void foo()\n"
"{\n"
" void *a = malloc(sizeof(a));\n"
" a = realloc((void*)a, sizeof(a) * 2);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Common realloc mistake: \'a\' nulled but not freed upon failure\n", errout.str());
}
void realloc19() {
check("void foo()\n"
"{\n"
" void *a = malloc(sizeof(a));\n"
" a = (realloc((void*)((a)), sizeof(a) * 2));\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Common realloc mistake: \'a\' nulled but not freed upon failure\n", errout.str());
}
void realloc20() {
check("void foo()\n"
"{\n"
" void *a = malloc(sizeof(a));\n"
" a = realloc((a) + 1, sizeof(a) * 2);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void realloc21() {
check("char *foo(char *bs0)\n"
"{\n"
" char *bs = bs0;\n"
" bs = realloc(bs, 100);\n"
" if (bs == NULL) return bs0;\n"
" return bs;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void realloc22() {
check("void foo(char **bsp)\n"
"{\n"
" char *bs = *bsp;\n"
" bs = realloc(bs, 100);\n"
" if (bs == NULL) return;\n"
" *bsp = bs;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void realloc23() {
check("void foo(struct ABC *s)\n"
"{\n"
" uint32_t *cigar = s->cigar;\n"
" if (!(cigar = realloc(cigar, 100 * sizeof(*cigar))))\n"
" return;\n"
" s->cigar = cigar;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void realloc24() { // #9228
check("void f() {\n"
"void *a = NULL;\n"
"a = realloc(a, 20);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
"void *a = NULL;\n"
"a = malloc(10);\n"
"a = realloc(a, 20);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Common realloc mistake: \'a\' nulled but not freed upon failure\n", errout.str());
check("void f() {\n"
"void *a = std::nullptr;\n"
"a = malloc(10);\n"
"a = realloc(a, 20);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Common realloc mistake: \'a\' nulled but not freed upon failure\n", errout.str());
check("void f(char *b) {\n"
"void *a = NULL;\n"
"a = b;\n"
"a = realloc(a, 20);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void reallocarray1() {
check("void foo()\n"
"{\n"
" char *a = (char *)malloc(10);\n"
" a = reallocarray(a, 100, 2);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Common reallocarray mistake: \'a\' nulled but not freed upon failure\n", errout.str());
}
};
REGISTER_TEST(TestMemleakInFunction)
class TestMemleakInClass : public TestFixture {
public:
TestMemleakInClass() : TestFixture("TestMemleakInClass") {
}
private:
Settings settings;
/**
* Tokenize and execute leak check for given code
* @param code Source code
*/
void check(const char code[]) {
// Clear the error buffer..
errout.str("");
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
// Check for memory leaks..
CheckMemoryLeakInClass checkMemoryLeak(&tokenizer, &settings, this);
checkMemoryLeak.check();
}
void run() OVERRIDE {
settings.severity.enable(Severity::warning);
settings.severity.enable(Severity::style);
LOAD_LIB_2(settings.library, "std.cfg");
TEST_CASE(class1);
TEST_CASE(class2);
TEST_CASE(class3);
TEST_CASE(class4);
TEST_CASE(class6);
TEST_CASE(class7);
TEST_CASE(class8);
TEST_CASE(class9);
TEST_CASE(class10);
TEST_CASE(class11);
TEST_CASE(class12);
TEST_CASE(class13);
TEST_CASE(class14);
TEST_CASE(class15);
TEST_CASE(class16);
TEST_CASE(class17);
TEST_CASE(class18);
TEST_CASE(class19); // ticket #2219
TEST_CASE(class20);
TEST_CASE(class21); // ticket #2517
TEST_CASE(class22); // ticket #3012
TEST_CASE(class23); // ticket #3303
TEST_CASE(class24); // ticket #3806 - false positive in copy constructor
TEST_CASE(class25); // ticket #4367 - false positive implementation for destructor is not seen
TEST_CASE(staticvar);
TEST_CASE(free_member_in_sub_func);
TEST_CASE(mismatch1);
TEST_CASE(mismatch2); // #5659
// allocating member variable in public function
TEST_CASE(func1);
TEST_CASE(func2);
}
void class1() {
check("class Fred\n"
"{\n"
"private:\n"
" char *str1;\n"
" char *str2;\n"
"public:\n"
" Fred();\n"
" ~Fred();\n"
"};\n"
"\n"
"Fred::Fred()\n"
"{\n"
" str1 = new char[10];\n"
" str2 = new char[10];\n"
"}\n"
"\n"
"Fred::~Fred()\n"
"{\n"
" delete [] str2;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (style) Class 'Fred' is unsafe, 'Fred::str1' can leak by wrong usage.\n", errout.str());
check("class Fred\n"
"{\n"
"private:\n"
" char *str1;\n"
" char *str2;\n"
"public:\n"
" Fred()\n"
" {\n"
" str1 = new char[10];\n"
" str2 = new char[10];\n"
" }\n"
" ~Fred()\n"
" {\n"
" delete [] str2;\n"
" }\n"
"};");
ASSERT_EQUALS("[test.cpp:4]: (style) Class 'Fred' is unsafe, 'Fred::str1' can leak by wrong usage.\n", errout.str());
}
void class2() {
check("class Fred\n"
"{\n"
"private:\n"
" char *str1;\n"
"public:\n"
" Fred();\n"
" ~Fred();\n"
"};\n"
"\n"
"Fred::Fred()\n"
"{\n"
" str1 = new char[10];\n"
"}\n"
"\n"
"Fred::~Fred()\n"
"{\n"
" free(str1);\n"
"}");
ASSERT_EQUALS("[test.cpp:17]: (error) Mismatching allocation and deallocation: Fred::str1\n", errout.str());
check("class Fred\n"
"{\n"
"private:\n"
" char *str1;\n"
"public:\n"
" Fred()\n"
" {\n"
" str1 = new char[10];\n"
" }\n"
" ~Fred()\n"
" {\n"
" free(str1);\n"
" }\n"
"};");
ASSERT_EQUALS("[test.cpp:12]: (error) Mismatching allocation and deallocation: Fred::str1\n", errout.str());
}
void class3() {
check("class Token;\n"
"\n"
"class Tokenizer\n"
"{\n"
"private:\n"
" Token *_tokens;\n"
"\n"
"public:\n"
" Tokenizer();\n"
" ~Tokenizer();\n"
" void deleteTokens(Token *tok);\n"
"};\n"
"\n"
"Tokenizer::Tokenizer()\n"
"{\n"
" _tokens = new Token;\n"
"}\n"
"\n"
"Tokenizer::~Tokenizer()\n"
"{\n"
" deleteTokens(_tokens);\n"
"}\n"
"\n"
"void Tokenizer::deleteTokens(Token *tok)\n"
"{\n"
" while (tok)\n"
" {\n"
" Token *next = tok->next();\n"
" delete tok;\n"
" tok = next;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("class Token;\n"
"\n"
"class Tokenizer\n"
"{\n"
"private:\n"
" Token *_tokens;\n"
"\n"
"public:\n"
" Tokenizer()\n"
" {\n"
" _tokens = new Token;\n"
" }\n"
" ~Tokenizer()\n"
" {\n"
" deleteTokens(_tokens);\n"
" }\n"
" void deleteTokens(Token *tok)\n"
" {\n"
" while (tok)\n"
" {\n"
" Token *next = tok->next();\n"
" delete tok;\n"
" tok = next;\n"
" }\n"
" }\n"
"};");
ASSERT_EQUALS("", errout.str());
}
void class4() {
check("struct ABC;\n"
"class Fred\n"
"{\n"
"private:\n"
" void addAbc(ABC *abc);\n"
"public:\n"
" void click();\n"
"};\n"
"\n"
"void Fred::addAbc(ABC* abc)\n"
"{\n"
" AbcPosts->Add(abc);\n"
"}\n"
"\n"
"void Fred::click()\n"
"{\n"
" ABC *p = new ABC;\n"
" addAbc( p );\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct ABC;\n"
"class Fred\n"
"{\n"
"private:\n"
" void addAbc(ABC* abc)\n"
" {\n"
" AbcPosts->Add(abc);\n"
" }\n"
"public:\n"
" void click()\n"
" {\n"
" ABC *p = new ABC;\n"
" addAbc( p );\n"
" }\n"
"};");
ASSERT_EQUALS("", errout.str());
}
void class6() {
check("class Fred\n"
"{\n"
"public:\n"
" void foo();\n"
"};\n"
"\n"
"void Fred::foo()\n"
"{\n"
" char *str = new char[100];\n"
" delete [] str;\n"
" hello();\n"
"}");
ASSERT_EQUALS("", errout.str());
check("class Fred\n"
"{\n"
"public:\n"
" void foo()\n"
" {\n"
" char *str = new char[100];\n"
" delete [] str;\n"
" hello();\n"
" }\n"
"};");
ASSERT_EQUALS("", errout.str());
}
void class7() {
check("class Fred\n"
"{\n"
"public:\n"
" int *i;\n"
" Fred();\n"
" ~Fred();\n"
"};\n"
"\n"
"Fred::Fred()\n"
"{\n"
" this->i = new int;\n"
"}\n"
"Fred::~Fred()\n"
"{\n"
" delete this->i;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("class Fred\n"
"{\n"
"public:\n"
" int *i;\n"
" Fred()\n"
" {\n"
" this->i = new int;\n"
" }\n"
" ~Fred()\n"
" {\n"
" delete this->i;\n"
" }\n"
"};");
ASSERT_EQUALS("", errout.str());
}
void class8() {
check("class A\n"
"{\n"
"public:\n"
" void a();\n"
" void doNothing() { }\n"
"};\n"
"\n"
"void A::a()\n"
"{\n"
" int* c = new int(1);\n"
" delete c;\n"
" doNothing(c);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("class A\n"
"{\n"
"public:\n"
" void a()\n"
" {\n"
" int* c = new int(1);\n"
" delete c;\n"
" doNothing(c);\n"
" }\n"
" void doNothing() { }\n"
"};");
ASSERT_EQUALS("", errout.str());
}
void class9() {
check("class A\n"
"{\n"
"public:\n"
" int * p;\n"
" A();\n"
" ~A();\n"
"};\n"
"\n"
"A::A()\n"
"{ p = new int; }\n"
"\n"
"A::~A()\n"
"{ delete (p); }");
ASSERT_EQUALS("", errout.str());
check("class A\n"
"{\n"
"public:\n"
" int * p;\n"
" A()\n"
" { p = new int; }\n"
" ~A()\n"
" { delete (p); }\n"
"};");
ASSERT_EQUALS("", errout.str());
}
void class10() {
check("class A\n"
"{\n"
"public:\n"
" int * p;\n"
" A();\n"
"};\n"
"A::A()\n"
"{ p = new int; }");
ASSERT_EQUALS("[test.cpp:4]: (style) Class 'A' is unsafe, 'A::p' can leak by wrong usage.\n", errout.str());
check("class A\n"
"{\n"
"public:\n"
" int * p;\n"
" A() { p = new int; }\n"
"};");
ASSERT_EQUALS("[test.cpp:4]: (style) Class 'A' is unsafe, 'A::p' can leak by wrong usage.\n", errout.str());
}
void class11() {
check("class A\n"
"{\n"
"public:\n"
" int * p;\n"
" A() : p(new int[10])\n"
" { }"
"};");
ASSERT_EQUALS("[test.cpp:4]: (style) Class 'A' is unsafe, 'A::p' can leak by wrong usage.\n", errout.str());
check("class A\n"
"{\n"
"public:\n"
" int * p;\n"
" A();\n"
"};\n"
"A::A() : p(new int[10])\n"
"{ }");
ASSERT_EQUALS("[test.cpp:4]: (style) Class 'A' is unsafe, 'A::p' can leak by wrong usage.\n", errout.str());
}
void class12() {
check("class A\n"
"{\n"
"private:\n"
" int *p;\n"
"public:\n"
" A();\n"
" ~A();\n"
" void cleanup();"
"};\n"
"\n"
"A::A()\n"
"{ p = new int[10]; }\n"
"\n"
"A::~A()\n"
"{ }\n"
"\n"
"void A::cleanup()\n"
"{ delete [] p; }");
ASSERT_EQUALS("[test.cpp:4]: (style) Class 'A' is unsafe, 'A::p' can leak by wrong usage.\n", errout.str());
check("class A\n"
"{\n"
"private:\n"
" int *p;\n"
"public:\n"
" A()\n"
" { p = new int[10]; }\n"
" ~A()\n"
" { }\n"
" void cleanup()\n"
" { delete [] p; }\n"
"};");
ASSERT_EQUALS("[test.cpp:4]: (style) Class 'A' is unsafe, 'A::p' can leak by wrong usage.\n", errout.str());
}
void class13() {
check("class A\n"
"{\n"
"private:\n"
" int *p;\n"
"public:\n"
" A();\n"
" ~A();\n"
" void foo();"
"};\n"
"\n"
"A::A()\n"
"{ }\n"
"\n"
"A::~A()\n"
"{ }\n"
"\n"
"void A::foo()\n"
"{ p = new int[10]; delete [] p; }");
ASSERT_EQUALS("[test.cpp:17]: (warning) Possible leak in public function. The pointer 'p' is not deallocated before it is allocated.\n", errout.str());
check("class A\n"
"{\n"
"private:\n"
" int *p;\n"
"public:\n"
" A()\n"
" { }\n"
" ~A()\n"
" { }\n"
" void foo()\n"
" { p = new int[10]; delete [] p; }\n"
"};");
ASSERT_EQUALS("[test.cpp:11]: (warning) Possible leak in public function. The pointer 'p' is not deallocated before it is allocated.\n", errout.str());
}
void class14() {
check("class A\n"
"{\n"
" int *p;\n"
"public:\n"
" void init();\n"
"};\n"
"\n"
"void A::init()\n"
"{ p = new int[10]; }");
ASSERT_EQUALS("[test.cpp:9]: (warning) Possible leak in public function. The pointer 'p' is not deallocated before it is allocated.\n"
"[test.cpp:3]: (style) Class 'A' is unsafe, 'A::p' can leak by wrong usage.\n", errout.str());
check("class A\n"
"{\n"
" int *p;\n"
"public:\n"
" void init()\n"
" { p = new int[10]; }\n"
"};");
ASSERT_EQUALS("[test.cpp:6]: (warning) Possible leak in public function. The pointer 'p' is not deallocated before it is allocated.\n"
"[test.cpp:3]: (style) Class 'A' is unsafe, 'A::p' can leak by wrong usage.\n", errout.str());
check("class A\n"
"{\n"
" int *p;\n"
"public:\n"
" void init();\n"
"};\n"
"\n"
"void A::init()\n"
"{ p = new int; }");
ASSERT_EQUALS("[test.cpp:9]: (warning) Possible leak in public function. The pointer 'p' is not deallocated before it is allocated.\n"
"[test.cpp:3]: (style) Class 'A' is unsafe, 'A::p' can leak by wrong usage.\n", errout.str());
check("class A\n"
"{\n"
" int *p;\n"
"public:\n"
" void init()\n"
" { p = new int; }\n"
"};");
ASSERT_EQUALS("[test.cpp:6]: (warning) Possible leak in public function. The pointer 'p' is not deallocated before it is allocated.\n"
"[test.cpp:3]: (style) Class 'A' is unsafe, 'A::p' can leak by wrong usage.\n", errout.str());
check("class A\n"
"{\n"
" int *p;\n"
"public:\n"
" void init();\n"
"};\n"
"\n"
"void A::init()\n"
"{ p = malloc(sizeof(int)*10); }");
ASSERT_EQUALS("[test.cpp:9]: (warning) Possible leak in public function. The pointer 'p' is not deallocated before it is allocated.\n"
"[test.cpp:3]: (style) Class 'A' is unsafe, 'A::p' can leak by wrong usage.\n", errout.str());
check("class A\n"
"{\n"
" int *p;\n"
"public:\n"
" void init()\n"
" { p = malloc(sizeof(int)*10); }\n"
"};");
ASSERT_EQUALS("[test.cpp:6]: (warning) Possible leak in public function. The pointer 'p' is not deallocated before it is allocated.\n"
"[test.cpp:3]: (style) Class 'A' is unsafe, 'A::p' can leak by wrong usage.\n", errout.str());
}
void class15() {
check("class A\n"
"{\n"
" int *p;\n"
"public:\n"
" A();\n"
" ~A() { delete [] p; }\n"
"};\n"
"A::A()\n"
"{ p = new int[10]; }");
ASSERT_EQUALS("", errout.str());
check("class A\n"
"{\n"
" int *p;\n"
"public:\n"
" A()\n"
" { p = new int[10]; }\n"
" ~A() { delete [] p; }\n"
"};");
ASSERT_EQUALS("", errout.str());
check("class A\n"
"{\n"
" int *p;\n"
"public:\n"
" A();\n"
" ~A() { delete p; }\n"
"};\n"
"A::A()\n"
"{ p = new int; }");
ASSERT_EQUALS("", errout.str());
check("class A\n"
"{\n"
" int *p;\n"
"public:\n"
" A()\n"
" { p = new int; }\n"
" ~A() { delete p; }\n"
"};");
ASSERT_EQUALS("", errout.str());
check("class A\n"
"{\n"
" int *p;\n"
"public:\n"
" A();\n"
" ~A() { free(p); }\n"
"};\n"
"A::A()\n"
"{ p = malloc(sizeof(int)*10); }");
ASSERT_EQUALS("", errout.str());
check("class A\n"
"{\n"
" int *p;\n"
"public:\n"
" A()\n"
" { p = malloc(sizeof(int)*10); }\n"
" ~A() { free(p); }\n"
"};");
ASSERT_EQUALS("", errout.str());
}
void class16() {
// Ticket #1510
check("class A\n"
"{\n"
" int *a;\n"
" int *b;\n"
"public:\n"
" A() { a = b = new int[10]; }\n"
" ~A() { delete [] a; }\n"
"};");
ASSERT_EQUALS("", errout.str());
}
void class17() {
// Ticket #1557
check("class A {\n"
"private:\n"
" char *pd;\n"
"public:\n"
" void foo();\n"
"};\n"
"\n"
"void A::foo()\n"
"{\n"
" A::pd = new char[12];\n"
" delete [] A::pd;\n"
"}");
ASSERT_EQUALS("[test.cpp:10]: (warning) Possible leak in public function. The pointer 'pd' is not deallocated before it is allocated.\n", errout.str());
check("class A {\n"
"private:\n"
" char *pd;\n"
"public:\n"
" void foo()\n"
" {\n"
" pd = new char[12];\n"
" delete [] pd;\n"
" }\n"
"};");
ASSERT_EQUALS("[test.cpp:7]: (warning) Possible leak in public function. The pointer 'pd' is not deallocated before it is allocated.\n", errout.str());
check("class A {\n"
"private:\n"
" char *pd;\n"
"public:\n"
" void foo();\n"
"};\n"
"\n"
"void A::foo()\n"
"{\n"
" pd = new char[12];\n"
" delete [] pd;\n"
"}");
ASSERT_EQUALS("[test.cpp:10]: (warning) Possible leak in public function. The pointer 'pd' is not deallocated before it is allocated.\n", errout.str());
}
void class18() {
// Ticket #853
check("class A : public x\n"
"{\n"
"public:\n"
" A()\n"
" {\n"
" a = new char[10];\n"
" foo(a);\n"
" }\n"
"private:\n"
" char *a;\n"
"};");
ASSERT_EQUALS("", errout.str());
check("class A : public x\n"
"{\n"
"public:\n"
" A();\n"
"private:\n"
" char *a;\n"
"};\n"
"A::A()\n"
"{\n"
" a = new char[10];\n"
" foo(a);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void class19() {
// Ticket #2219
check("class Foo\n"
"{\n"
"private:\n"
" TRadioButton* rp1;\n"
" TRadioButton* rp2;\n"
"public:\n"
" Foo();\n"
"};\n"
"Foo::Foo()\n"
"{\n"
" rp1 = new TRadioButton(this);\n"
" rp2 = new TRadioButton(this);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("class TRadioButton { };\n"
"class Foo\n"
"{\n"
"private:\n"
" TRadioButton* rp1;\n"
" TRadioButton* rp2;\n"
"public:\n"
" Foo();\n"
"};\n"
"Foo::Foo()\n"
"{\n"
" rp1 = new TRadioButton;\n"
" rp2 = new TRadioButton;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (style) Class 'Foo' is unsafe, 'Foo::rp1' can leak by wrong usage.\n"
"[test.cpp:6]: (style) Class 'Foo' is unsafe, 'Foo::rp2' can leak by wrong usage.\n", errout.str());
check("class TRadioButton { };\n"
"class Foo\n"
"{\n"
"private:\n"
" TRadioButton* rp1;\n"
" TRadioButton* rp2;\n"
"public:\n"
" Foo();\n"
" ~Foo();\n"
"};\n"
"Foo::Foo()\n"
"{\n"
" rp1 = new TRadioButton;\n"
" rp2 = new TRadioButton;\n"
"}\n"
"Foo::~Foo()\n"
"{\n"
" delete rp1;\n"
" delete rp2;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void class20() {
check("namespace ns1 {\n"
" class Fred\n"
" {\n"
" private:\n"
" char *str1;\n"
" char *str2;\n"
" public:\n"
" Fred()\n"
" {\n"
" str1 = new char[10];\n"
" str2 = new char[10];\n"
" }\n"
" ~Fred()\n"
" {\n"
" delete [] str2;\n"
" }\n"
" };\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (style) Class 'Fred' is unsafe, 'Fred::str1' can leak by wrong usage.\n", errout.str());
check("namespace ns1 {\n"
" class Fred\n"
" {\n"
" private:\n"
" char *str1;\n"
" char *str2;\n"
" public:\n"
" Fred();\n"
" ~Fred();\n"
" };\n"
"\n"
" Fred::Fred()\n"
" {\n"
" str1 = new char[10];\n"
" str2 = new char[10];\n"
" }\n"
"\n"
" Fred::~Fred()\n"
" {\n"
" delete [] str2;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (style) Class 'Fred' is unsafe, 'Fred::str1' can leak by wrong usage.\n", errout.str());
check("namespace ns1 {\n"
" class Fred\n"
" {\n"
" private:\n"
" char *str1;\n"
" char *str2;\n"
" public:\n"
" Fred();\n"
" ~Fred();\n"
" };\n"
"}\n"
"ns1::Fred::Fred()\n"
"{\n"
" str1 = new char[10];\n"
" str2 = new char[10];\n"
"}\n"
"\n"
"ns1::Fred::~Fred()\n"
"{\n"
" delete [] str2;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (style) Class 'Fred' is unsafe, 'Fred::str1' can leak by wrong usage.\n", errout.str());
check("namespace ns1 {\n"
" namespace ns2 {\n"
" class Fred\n"
" {\n"
" private:\n"
" char *str1;\n"
" char *str2;\n"
" public:\n"
" Fred();\n"
" ~Fred();\n"
" };\n"
" }\n"
"}\n"
"ns1::ns2::Fred::Fred()\n"
"{\n"
" str1 = new char[10];\n"
" str2 = new char[10];\n"
"}\n"
"\n"
"ns1::ns2::Fred::~Fred()\n"
"{\n"
" delete [] str2;\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (style) Class 'Fred' is unsafe, 'Fred::str1' can leak by wrong usage.\n", errout.str());
check("namespace ns1 {\n"
" namespace ns2 {\n"
" namespace ns3 {\n"
" class Fred\n"
" {\n"
" private:\n"
" char *str1;\n"
" char *str2;\n"
" public:\n"
" Fred();\n"
" ~Fred();\n"
" };\n"
" }\n"
" }\n"
"}\n"
"ns1::ns2::ns3::Fred::Fred()\n"
"{\n"
" str1 = new char[10];\n"
" str2 = new char[10];\n"
"}\n"
"\n"
"ns1::ns2::ns3::Fred::~Fred()\n"
"{\n"
" delete [] str2;\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (style) Class 'Fred' is unsafe, 'Fred::str1' can leak by wrong usage.\n", errout.str());
}
void class21() { // ticket #2517
check("struct B { };\n"
"struct C\n"
"{\n"
" B * b;\n"
" C(B * x) : b(x) { }\n"
"};\n"
"class A\n"
"{\n"
" B *b;\n"
" C *c;\n"
"public:\n"
" A() : b(new B()), c(new C(b)) { }\n"
"}");
ASSERT_EQUALS("[test.cpp:9]: (style) Class 'A' is unsafe, 'A::b' can leak by wrong usage.\n"
"[test.cpp:10]: (style) Class 'A' is unsafe, 'A::c' can leak by wrong usage.\n", errout.str());
check("struct B { };\n"
"struct C\n"
"{\n"
" B * b;\n"
" C(B * x) : b(x) { }\n"
"};\n"
"class A\n"
"{\n"
" B *b;\n"
" C *c;\n"
"public:\n"
" A()\n"
" {\n"
" b = new B();\n"
" c = new C(b);\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:9]: (style) Class 'A' is unsafe, 'A::b' can leak by wrong usage.\n"
"[test.cpp:10]: (style) Class 'A' is unsafe, 'A::c' can leak by wrong usage.\n", errout.str());
}
void class22() { // ticket #3012 - false positive
check("class Fred {\n"
"private:\n"
" int * a;\n"
"private:\n"
" Fred() { a = new int; }\n"
" ~Fred() { (delete(a), (a)=NULL); }\n"
"};");
ASSERT_EQUALS("", errout.str());
}
void class23() { // ticket #3303 - false positive
check("class CDataImpl {\n"
"public:\n"
" CDataImpl() { m_refcount = 1; }\n"
" void Release() { if (--m_refcount == 0) delete this; }\n"
"private:\n"
" int m_refcount;\n"
"};\n"
"\n"
"class CData {\n"
"public:\n"
" CData() : m_impl(new CDataImpl()) { }\n"
" ~CData() { if (m_impl) m_impl->Release(); }\n"
"private:\n"
" CDataImpl *m_impl;\n"
"};");
ASSERT_EQUALS("", errout.str());
}
void class24() { // ticket #3806 - false positive in copy constructor
check("class Fred {\n"
"private:\n"
" int * a;\n"
"public:\n"
" Fred(const Fred &fred) { a = new int; }\n"
" ~Fred() { delete a; }\n"
"};");
ASSERT_EQUALS("", errout.str());
}
void class25() { // ticket #4367 - false positive when implementation for destructor is not seen
check("class Fred {\n"
"private:\n"
" int * a;\n"
"public:\n"
" Fred() { a = new int; }\n"
" ~Fred();\n"
"};");
ASSERT_EQUALS("", errout.str());
}
void staticvar() {
check("class A\n"
"{\n"
"private:\n"
" static int * p;\n"
"public:"
" A()\n"
" {\n"
" if (!p)\n"
" p = new int[100];\n"
" }\n"
"};");
ASSERT_EQUALS("", errout.str());
}
void free_member_in_sub_func() {
// Member function
check("class Tokenizer\n"
"{\n"
"public:\n"
" Tokenizer();\n"
" ~Tokenizer();\n"
"\n"
"private:\n"
" int *_tokens;\n"
" static void deleteTokens(int *tok);\n"
"};\n"
"\n"
"Tokenizer::Tokenizer()\n"
"{\n"
" _tokens = new int;\n"
"}\n"
"\n"
"Tokenizer::~Tokenizer()\n"
"{\n"
" deleteTokens(_tokens);\n"
" _tokens = 0;\n"
"}\n"
"\n"
"void Tokenizer::deleteTokens(int *tok)\n"
"{\n"
" delete tok;\n"
"}");
ASSERT_EQUALS("", errout.str());
// Global function
check("void deleteTokens(int *tok)\n"
"{\n"
" delete tok;\n"
"}\n"
"class Tokenizer\n"
"{\n"
"public:\n"
" Tokenizer();\n"
" ~Tokenizer();\n"
"\n"
"private:\n"
" int *_tokens;\n"
"};\n"
"\n"
"Tokenizer::Tokenizer()\n"
"{\n"
" _tokens = new int;\n"
"}\n"
"\n"
"Tokenizer::~Tokenizer()\n"
"{\n"
" deleteTokens(_tokens);\n"
" _tokens = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void mismatch1() {
check("class A\n"
"{\n"
"public:\n"
" A(int i);\n"
" ~A();\n"
"private:\n"
" char* pkt_buffer;\n"
"};\n"
"\n"
"A::A(int i)\n"
"{\n"
" pkt_buffer = new char[8192];\n"
" if (i != 1) {\n"
" delete pkt_buffer;\n"
" pkt_buffer = 0;\n"
" }\n"
"}\n"
"\n"
"A::~A() {\n"
" delete [] pkt_buffer;\n"
"}");
ASSERT_EQUALS("[test.cpp:14]: (error) Mismatching allocation and deallocation: A::pkt_buffer\n", errout.str());
}
void mismatch2() { // #5659
check("namespace NS\n"
"{\n"
"class Foo\n"
"{\n"
"public:\n"
" void fct();\n"
"\n"
"private:\n"
" char* data_;\n"
"};\n"
"}\n"
"\n"
"using namespace NS;\n"
"\n"
"void Foo::fct()\n"
"{\n"
" data_ = new char[42];\n"
" delete data_;\n"
" data_ = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:17]: (warning) Possible leak in public function. The pointer 'data_' is not deallocated before it is allocated.\n"
"[test.cpp:18]: (error) Mismatching allocation and deallocation: Foo::data_\n", errout.str());
check("namespace NS\n"
"{\n"
"class Foo\n"
"{\n"
"public:\n"
" void fct(int i);\n"
"\n"
"private:\n"
" char* data_;\n"
"};\n"
"}\n"
"\n"
"using namespace NS;\n"
"\n"
"void Foo::fct(int i)\n"
"{\n"
" data_ = new char[42];\n"
" delete data_;\n"
" data_ = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:17]: (warning) Possible leak in public function. The pointer 'data_' is not deallocated before it is allocated.\n"
"[test.cpp:18]: (error) Mismatching allocation and deallocation: Foo::data_\n", errout.str());
}
void func1() {
check("class Fred\n"
"{\n"
"private:\n"
" char *s;\n"
"public:\n"
" Fred() { s = 0; }\n"
" ~Fred() { free(s); }\n"
" void xy()\n"
" { s = malloc(100); }\n"
"};");
ASSERT_EQUALS("[test.cpp:9]: (warning) Possible leak in public function. The pointer 's' is not deallocated before it is allocated.\n", errout.str());
check("class Fred\n"
"{\n"
"public:\n"
" Fred() { s = 0; }\n"
" ~Fred() { free(s); }\n"
" void xy()\n"
" { s = malloc(100); }\n"
"private:\n"
" char *s;\n"
"};");
ASSERT_EQUALS("[test.cpp:7]: (warning) Possible leak in public function. The pointer 's' is not deallocated before it is allocated.\n", errout.str());
}
void func2() {
check("class Fred\n"
"{\n"
"private:\n"
" char *s;\n"
"public:\n"
" Fred() { s = 0; }\n"
" ~Fred() { free(s); }\n"
" const Fred & operator = (const Fred &f)\n"
" { s = malloc(100); }\n"
"};");
ASSERT_EQUALS("[test.cpp:9]: (warning) Possible leak in public function. The pointer 's' is not deallocated before it is allocated.\n", errout.str());
}
};
REGISTER_TEST(TestMemleakInClass)
class TestMemleakStructMember : public TestFixture {
public:
TestMemleakStructMember() : TestFixture("TestMemleakStructMember") {
}
private:
Settings settings;
void check(const char code[], bool isCPP = true) {
// Clear the error buffer..
errout.str("");
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, isCPP ? "test.cpp" : "test.c");
// Check for memory leaks..
CheckMemoryLeakStructMember checkMemoryLeakStructMember(&tokenizer, &settings, this);
checkMemoryLeakStructMember.check();
}
void run() OVERRIDE {
LOAD_LIB_2(settings.library, "std.cfg");
LOAD_LIB_2(settings.library, "posix.cfg");
// testing that errors are detected
TEST_CASE(err);
// handle / bail out when "goto" is found
TEST_CASE(goto_);
// Don't report errors if the struct is returned
TEST_CASE(ret1);
TEST_CASE(ret2);
// assignments
TEST_CASE(assign1);
TEST_CASE(assign2);
TEST_CASE(assign3);
// Failed allocation
TEST_CASE(failedAllocation);
TEST_CASE(function1); // Deallocating in function
TEST_CASE(function2); // #2848: Taking address in function
TEST_CASE(function3); // #3024: kernel list
TEST_CASE(function4); // #3038: Deallocating in function
// Handle if-else
TEST_CASE(ifelse);
// Linked list
TEST_CASE(linkedlist);
// struct variable is a global variable
TEST_CASE(globalvar);
// local struct variable
TEST_CASE(localvars);
// struct variable is a reference variable
TEST_CASE(refvar);
// Segmentation fault in CheckMemoryLeakStructMember
TEST_CASE(trac5030);
TEST_CASE(varid); // #5201: Analysis confused by (variable).attribute notation
TEST_CASE(varid_2); // #5315: Analysis confused by ((variable).attribute) notation
TEST_CASE(customAllocation);
TEST_CASE(lambdaInForLoop); // #9793
}
void err() {
check("static void foo()\n"
"{\n"
" struct ABC *abc = malloc(sizeof(struct ABC));\n"
" abc->a = malloc(10);\n"
" free(abc);\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Memory leak: abc.a\n", errout.str());
check("static void foo()\n"
"{\n"
" struct ABC *abc = malloc(sizeof(struct ABC));\n"
" abc->a = malloc(10);\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Memory leak: abc.a\n", errout.str());
check("static ABC * foo()\n"
"{\n"
" ABC *abc = malloc(sizeof(ABC));\n"
" abc->a = malloc(10);\n"
" abc->b = malloc(10);\n"
" if (abc->b == 0)\n"
" {\n"
" return 0;\n"
" }\n"
" return abc;\n"
"}");
ASSERT_EQUALS("[test.cpp:8]: (error) Memory leak: abc.a\n", errout.str());
check("static void foo(int a)\n"
"{\n"
" ABC *abc = malloc(sizeof(ABC));\n"
" abc->a = malloc(10);\n"
" if (a == 1)\n"
" {\n"
" free(abc->a);\n"
" return;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:10]: (error) Memory leak: abc.a\n", errout.str());
}
void goto_() {
check("static void foo()\n"
"{\n"
" struct ABC *abc = malloc(sizeof(struct ABC));\n"
" abc->a = malloc(10);\n"
" if (abc->a)\n"
" { goto out; }\n"
" free(abc);\n"
" return;\n"
"out:\n"
" free(abc->a);\n"
" free(abc);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void ret1() {
check("static ABC * foo()\n"
"{\n"
" struct ABC *abc = malloc(sizeof(struct ABC));\n"
" abc->a = malloc(10);\n"
" return abc;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("static void foo(struct ABC *abc)\n"
"{\n"
" abc->a = malloc(10);\n"
"}");
ASSERT_EQUALS("", errout.str());
// #7302
check("void* foo() {\n"
" struct ABC abc;\n"
" abc.a = malloc(10);\n"
" return abc.a;\n"
"}", false);
ASSERT_EQUALS("", errout.str());
check("void* foo() {\n"
" struct ABC abc;\n"
" abc.a = malloc(10);\n"
" return abc.b;\n"
"}", false);
ASSERT_EQUALS("[test.c:4]: (error) Memory leak: abc.a\n", errout.str());
}
void ret2() {
check("static ABC * foo()\n"
"{\n"
" struct ABC *abc = malloc(sizeof(struct ABC));\n"
" abc->a = malloc(10);\n"
" return &abc->self;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void assign1() {
check("static void foo()\n"
"{\n"
" struct ABC *abc = abc1;\n"
" abc->a = malloc(10);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("static void foo()\n"
"{\n"
" struct ABC *abc;\n"
" abc1 = abc = malloc(sizeof(ABC));\n"
" abc->a = malloc(10);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("static void foo()\n"
"{\n"
" struct msn_entry *ptr;\n"
" ptr = malloc(sizeof(struct msn_entry));\n"
" ptr->msn = malloc(100);\n"
" back = ptr;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void assign2() {
check("static void foo() {\n"
" struct ABC *abc = malloc(123);\n"
" abc->a = abc->b = malloc(10);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void assign3() {
check("void f(struct s *f1) {\n"
" struct s f2;\n"
" f2.a = malloc(100);\n"
" *f1 = f2;\n"
"}", false);
ASSERT_EQUALS("", errout.str());
}
void failedAllocation() {
check("static struct ABC * foo()\n"
"{\n"
" struct ABC *abc = malloc(sizeof(struct ABC));\n"
" abc->a = malloc(10);\n"
" if (!abc->a)\n"
" {\n"
" free(abc);\n"
" return 0;\n"
" }\n"
" return abc;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void function1() {
// Not found function => assume that the function may deallocate
check("static void foo()\n"
"{\n"
" struct ABC *abc = malloc(sizeof(struct ABC));\n"
" abc->a = malloc(10);\n"
" func(abc);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("static void foo()\n"
"{\n"
" struct ABC *abc = malloc(sizeof(struct ABC));\n"
" abclist.push_back(abc);\n"
" abc->a = malloc(10);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// #2848: Taking address in function 'assign'
void function2() {
check("void f() {\n"
" A a = { 0 };\n"
" a.foo = (char *) malloc(10);\n"
" assign(&a);\n"
"}", false);
ASSERT_EQUALS("", errout.str());
}
// #3024: kernel list
void function3() {
check("void f() {\n"
" struct ABC *abc = malloc(100);\n"
" abc.a = (char *) malloc(10);\n"
" list_add_tail(&abc->list, head);\n"
"}", false);
ASSERT_EQUALS("", errout.str());
}
// #3038: deallocating in function
void function4() {
check("void a(char *p) { char *x = p; free(x); }\n"
"void b() {\n"
" struct ABC abc;\n"
" abc.a = (char *) malloc(10);\n"
" a(abc.a);\n"
"}", false);
ASSERT_EQUALS("", errout.str());
}
void ifelse() {
check("static void foo()\n"
"{\n"
" struct ABC *abc = malloc(sizeof(struct ABC));\n"
" if (x)"
" {\n"
" abc->a = malloc(10);\n"
" }\n"
" else\n"
" {\n"
" free(abc);\n"
" return;\n"
" }\n"
" free(abc->a);\n"
" free(abc);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void linkedlist() {
// #3904 - false positive when linked list is used
check("static void foo() {\n"
" struct ABC *abc = malloc(sizeof(struct ABC));\n"
" abc->next = malloc(sizeof(struct ABC));\n"
" abc->next->next = NULL;\n"
"\n"
" while (abc) {\n"
" struct ABC *next = abc->next;\n"
" free(abc);\n"
" abc = next;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void globalvar() {
check("struct ABC *abc;\n"
"\n"
"static void foo()\n"
"{\n"
" abc = malloc(sizeof(struct ABC));\n"
" abc->a = malloc(10);\n"
" return;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// Ticket #933 Leaks with struct members not detected
void localvars() {
// Test error case
const char code1[] = "struct A {\n"
" FILE* f;\n"
" char* c;\n"
" void* m;\n"
"};\n"
"\n"
"void func() {\n"
" struct A a;\n"
" a.f = fopen(\"test\", \"r\");\n"
" a.c = new char[12];\n"
" a.m = malloc(12);\n"
"}";
check(code1, true);
ASSERT_EQUALS("[test.cpp:12]: (error) Memory leak: a.f\n"
"[test.cpp:12]: (error) Memory leak: a.c\n"
"[test.cpp:12]: (error) Memory leak: a.m\n", errout.str());
check(code1, false);
ASSERT_EQUALS("[test.c:12]: (error) Memory leak: a.f\n"
"[test.c:12]: (error) Memory leak: a.m\n", errout.str());
// Test OK case
const char code2[] = "struct A {\n"
" FILE* f;\n"
" char* c;\n"
" void* m;\n"
"};\n"
"\n"
"void func() {\n"
" struct A a;\n"
" a.f = fopen(\"test\", \"r\");\n"
" a.c = new char[12];\n"
" a.m = malloc(12);\n"
" fclose(a.f);\n"
" delete [] a.c;\n"
" free(a.m);\n"
"}";
check(code2, true);
ASSERT_EQUALS("", errout.str());
check(code2, false);
ASSERT_EQUALS("", errout.str());
// Test unknown struct. In C++, it might have a destructor
const char code3[] = "void func() {\n"
" struct A a;\n"
" a.f = fopen(\"test\", \"r\");\n"
"}";
check(code3, true);
ASSERT_EQUALS("", errout.str());
check(code3, false);
ASSERT_EQUALS("[test.c:4]: (error) Memory leak: a.f\n", errout.str());
// Test struct with destructor
const char code4[] = "struct A {\n"
" FILE* f;\n"
" ~A();\n"
"};\n"
"void func() {\n"
" struct A a;\n"
" a.f = fopen(\"test\", \"r\");\n"
"}";
check(code4, true);
ASSERT_EQUALS("", errout.str());
}
void refvar() { // #8116
check("struct Test\n"
"{\n"
" int* data;\n"
"};\n"
"\n"
"void foo(Test* x)\n"
"{\n"
" Test& y = *x;\n"
" y.data = malloc(10);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// don't crash
void trac5030() {
check("bool bob( char const **column_ptrs ) {\n"
"unique_ptr<char[]>otherbuffer{new char[otherbufsize+1]};\n"
"char *const oldbuffer = otherbuffer.get();\n"
"int const oldbufsize = otherbufsize;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void varid() { // #5201
check("struct S {\n"
" void *state_check_buff;\n"
"};\n"
"void f() {\n"
" S s;\n"
" (s).state_check_buff = (void* )malloc(1);\n"
" if (s.state_check_buff == 0)\n"
" return;\n"
"}", false);
ASSERT_EQUALS("[test.c:9]: (error) Memory leak: s.state_check_buff\n", errout.str());
}
void varid_2() { // #5315
check("typedef struct foo { char *realm; } foo;\n"
"void build_principal() {\n"
" foo f;\n"
" ((f)->realm) = strdup(realm);\n"
" if(f->realm == NULL) {}\n"
"}", false);
TODO_ASSERT_EQUALS("[test.c:6]: (error) Memory leak: f.realm\n", "", errout.str());
}
void customAllocation() { // #4770
check("char *myalloc(void) {\n"
" return malloc(100);\n"
"}\n"
"void func() {\n"
" struct ABC abc;\n"
" abc.a = myalloc();\n"
"}", false);
ASSERT_EQUALS("[test.c:7]: (error) Memory leak: abc.a\n", errout.str());
}
void lambdaInForLoop() { // #9793
check(
"struct S { int * p{nullptr}; };\n"
"int main()\n"
"{\n"
" S s;\n"
" s.p = new int[10];\n"
" for (int i = 0; i < 10; ++i) {\n"
" s.p[i] = []() { return 1; }();\n"
" }\n"
" delete[] s.p;\n"
" return 0;\n"
"}", true);
ASSERT_EQUALS("", errout.str());
}
};
REGISTER_TEST(TestMemleakStructMember)
class TestMemleakNoVar : public TestFixture {
public:
TestMemleakNoVar() : TestFixture("TestMemleakNoVar") {
}
private:
Settings settings;
void check(const char code[]) {
// Clear the error buffer..
errout.str("");
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
// Check for memory leaks..
CheckMemoryLeakNoVar checkMemoryLeakNoVar(&tokenizer, &settings, this);
checkMemoryLeakNoVar.check();
}
void run() OVERRIDE {
settings.certainty.setEnabled(Certainty::inconclusive, true);
settings.libraries.emplace_back("posix");
settings.severity.enable(Severity::warning);
LOAD_LIB_2(settings.library, "std.cfg");
LOAD_LIB_2(settings.library, "posix.cfg");
// pass allocated memory to function..
TEST_CASE(functionParameter);
// never use leakable resource
TEST_CASE(missingAssignment);
// pass allocated memory to function using a smart pointer
TEST_CASE(smartPointerFunctionParam);
TEST_CASE(resourceLeak);
// Test getAllocationType for subfunction
TEST_CASE(getAllocationType);
}
void functionParameter() {
// standard function..
check("void x() {\n"
" strcpy(a, strdup(p));\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (error) Allocation with strdup, strcpy doesn't release it.\n", errout.str());
check("char *x() {\n"
" char *ret = strcpy(malloc(10), \"abc\");\n"
" return ret;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void x() {\n"
" free(malloc(10));\n"
"}");
ASSERT_EQUALS("", errout.str());
// user function..
check("void set_error(const char *msg) {\n"
"}\n"
"\n"
"void x() {\n"
" set_error(strdup(p));\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:5]: (error) Allocation with strdup, set_error doesn't release it.\n", "", errout.str());
check("void f()\n"
"{\n"
" int fd;\n"
" fd = mkstemp(strdup(\"/tmp/file.XXXXXXXX\"));\n"
" close(fd);\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:4]: (error) Allocation with strdup, mkstemp doesn't release it.\n", "", errout.str());
check("void f()\n"
"{\n"
" if(TRUE || strcmp(strdup(a), b));\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Allocation with strdup, strcmp doesn't release it.\n", errout.str());
check("void f()\n"
"{\n"
" if(!strcmp(strdup(a), b) == 0);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Allocation with strdup, strcmp doesn't release it.\n", errout.str());
check("void f()\n"
"{\n"
" 42, strcmp(strdup(a), b);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Allocation with strdup, strcmp doesn't release it.\n", errout.str());
check("void f() {\n"
" assert(freopen(\"/dev/null\", \"r\", stdin));\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void x() {\n"
" strcpy(a, (void*)strdup(p));\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (error) Allocation with strdup, strcpy doesn't release it.\n", errout.str());
check("void* malloc1() {\n"
" return (malloc(1));\n"
"}");
ASSERT_EQUALS("", errout.str());
check("char *x() {\n"
" char *ret = (char*)strcpy(malloc(10), \"abc\");\n"
" return ret;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" free(malloc(1));\n"
" strcpy(a, strdup(p));\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Allocation with strdup, strcpy doesn't release it.\n", errout.str());
check("void f() {\n"
" memcmp(calloc(10, 10), strdup(q), 100);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (error) Allocation with calloc, memcmp doesn't release it.\n"
"[test.cpp:2]: (error) Allocation with strdup, memcmp doesn't release it.\n", errout.str());
check("void* f(int size) {\n"
" return (void*) malloc(size);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int* f(int size) {\n"
" return static_cast<int*>(malloc(size));\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void missingAssignment() {
check("void x()\n"
"{\n"
" malloc(10);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Return value of allocation function 'malloc' is not stored.\n", errout.str());
check("void x()\n"
"{\n"
" calloc(10, 1);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Return value of allocation function 'calloc' is not stored.\n", errout.str());
check("void x()\n"
"{\n"
" strdup(\"Test\");\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Return value of allocation function 'strdup' is not stored.\n", errout.str());
check("void x()\n"
"{\n"
" reallocarray(NULL, 10, 10);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Return value of allocation function 'reallocarray' is not stored.\n", errout.str());
check("void x()\n"
"{\n"
" (char*) malloc(10);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Return value of allocation function 'malloc' is not stored.\n", errout.str());
check("void x()\n"
"{\n"
" char* ptr = malloc(10);\n"
" foo(ptr);\n"
" free(ptr);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("char** x(const char* str) {\n"
" char* ptr[] = { malloc(10), malloc(5), strdup(str) };\n"
" return ptr;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void x()\n"
"{\n"
" 42,malloc(42);\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:3]: (error) Return value of allocation function 'malloc' is not stored.\n", "", errout.str());
check("void *f()\n"
"{\n"
" return malloc(10);\n"
"}\n"
"void x()\n"
"{\n"
" f();\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (error) Return value of allocation function 'f' is not stored.\n", errout.str());
check("void f()\n" // #8100
"{\n"
" auto lambda = [](){return malloc(10);};\n"
"}\n"
"void x()\n"
"{\n"
" f();\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void *f() {\n" // #8848
" struct S { void *alloc() { return malloc(10); } };\n"
"}\n"
"void x()\n"
"{\n"
" f();\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void x()\n"
"{\n"
" if(!malloc(5)) fail();\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Return value of allocation function 'malloc' is not stored.\n", errout.str());
check("FOO* factory() {\n"
" FOO* foo = new (std::nothrow) FOO;\n"
" return foo;\n"
"}");
ASSERT_EQUALS("", errout.str());
// Ticket #6536
check("struct S { S(int) {} };\n"
"void foo(int i) {\n"
" S socket(i);\n"
"}");
ASSERT_EQUALS("", errout.str());
// Ticket #6693
check("struct CTest {\n"
" void Initialise();\n"
" void malloc();\n"
"};\n"
"void CTest::Initialise() {\n"
" malloc();\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo() {\n" // #7348 - cast
" p = (::X*)malloc(42);\n"
"}");
ASSERT_EQUALS("", errout.str());
// #7182 "crash: CheckMemoryLeak::functionReturnType()"
check("template<typename... Ts> auto unary_right_comma (Ts... ts) { return (ts , ...); }\n"
"template<typename T, typename... Ts> auto binary_left_comma (T x, Ts... ts) { return (x , ... , ts); }\n"
"int main() {\n"
" unary_right_comma (a);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void smartPointerFunctionParam() {
check("void x() {\n"
" f(shared_ptr<int>(new int(42)), g());\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Unsafe allocation. If g() throws, memory could be leaked. Use make_shared<int>() instead.\n", errout.str());
check("void x() {\n"
" h(12, f(shared_ptr<int>(new int(42)), g()));\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Unsafe allocation. If g() throws, memory could be leaked. Use make_shared<int>() instead.\n", errout.str());
check("void x() {\n"
" f(unique_ptr<int>(new int(42)), g());\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Unsafe allocation. If g() throws, memory could be leaked. Use make_unique<int>() instead.\n", errout.str());
check("void x() {\n"
" f(g(), shared_ptr<int>(new int(42)));\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Unsafe allocation. If g() throws, memory could be leaked. Use make_shared<int>() instead.\n", errout.str());
check("void x() {\n"
" f(g(), unique_ptr<int>(new int(42)));\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Unsafe allocation. If g() throws, memory could be leaked. Use make_unique<int>() instead.\n", errout.str());
check("void x() {\n"
" f(shared_ptr<char>(new char), make_unique<int>(32));\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Unsafe allocation. If make_unique<int>() throws, memory could be leaked. Use make_shared<char>() instead.\n", errout.str());
check("void x() {\n"
" f(g(124), h(\"test\", 234), shared_ptr<char>(new char));\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Unsafe allocation. If h() throws, memory could be leaked. Use make_shared<char>() instead.\n", errout.str());
check("void x() {\n"
" f(shared_ptr<std::string>(new std::string(\"\")), g<std::string>());\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Unsafe allocation. If g<std::string>() throws, memory could be leaked. Use make_shared<std::string>() instead.\n", errout.str());
check("void g(int x) throw() { }\n"
"void x() {\n"
" f(g(124), shared_ptr<char>(new char));\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void __declspec(nothrow) g(int x) { }\n"
"void x() {\n"
" f(g(124), shared_ptr<char>(new char));\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void resourceLeak() {
check("void foo() {\n"
" fopen(\"file.txt\", \"r\");\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (error) Return value of allocation function 'fopen' is not stored.\n", errout.str());
check("void foo() {\n"
" FILE f* = fopen(\"file.txt\", \"r\");\n"
" freopen(\"file.txt\", \"r\", f);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Return value of allocation function 'freopen' is not stored.\n", errout.str());
check("void foo() {\n"
" freopen(\"file.txt\", \"r\", stdin);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct Holder {\n"
" Holder(FILE* f) : file(f) {}\n"
" ~Holder() { fclose(file); }\n"
" FILE* file;\n"
"};\n"
"void foo() {\n"
" Holder h ( fopen(\"file.txt\", \"r\"));\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct Holder {\n"
" Holder(FILE* f) : file(f) {}\n"
" ~Holder() { fclose(file); }\n"
" FILE* file;\n"
"};\n"
"void foo() {\n"
" Holder ( fopen(\"file.txt\", \"r\"));\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct Holder {\n"
" Holder(FILE* f) : file(f) {}\n"
" ~Holder() { fclose(file); }\n"
" FILE* file;\n"
"};\n"
"void foo() {\n"
" Holder h { fopen(\"file.txt\", \"r\")};\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct Holder {\n"
" Holder(FILE* f) : file(f) {}\n"
" ~Holder() { fclose(file); }\n"
" FILE* file;\n"
"};\n"
"void foo() {\n"
" Holder h = fopen(\"file.txt\", \"r\");\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct Holder {\n"
" Holder(FILE* f) : file(f) {}\n"
" ~Holder() { fclose(file); }\n"
" FILE* file;\n"
"};\n"
"void foo() {\n"
" Holder { fopen(\"file.txt\", \"r\")};\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct Holder {\n"
" Holder(int i, FILE* f) : file(f) {}\n"
" ~Holder() { fclose(file); }\n"
" FILE* file;\n"
"};\n"
"void foo() {\n"
" Holder { 0, fopen(\"file.txt\", \"r\")};\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void getAllocationType() {
// #7845
check("class Thing { Thing(); };\n"
"Thing * makeThing() { Thing *thing = new Thing; return thing; }\n"
"\n"
"void f() {\n"
" makeThing();\n"
"}");
ASSERT_EQUALS("", errout.str());
}
};
REGISTER_TEST(TestMemleakNoVar)
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