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681 lines (598 loc) · 20.7 KB
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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2014 Daniel Marjamäki and Cppcheck team.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "tokenize.h"
#include "checkleakautovar.h"
#include "testsuite.h"
#include <sstream>
extern std::ostringstream errout;
class TestLeakAutoVar : public TestFixture {
public:
TestLeakAutoVar() : TestFixture("TestLeakAutoVar") {
}
private:
void run() {
// 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(deallocuse1);
TEST_CASE(deallocuse2);
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(doublefree1);
TEST_CASE(doublefree2);
TEST_CASE(doublefree3); // #4914
TEST_CASE(doublefree4); // #5451 - FP when exit is called
// exit
TEST_CASE(exit1);
TEST_CASE(exit2);
// goto
TEST_CASE(goto1);
TEST_CASE(goto2);
// 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)
// switch
TEST_CASE(switch1);
// loops
TEST_CASE(loop1);
// mismatching allocation/deallocation
TEST_CASE(mismatch_fopen_free);
// Execution reaches a 'return'
TEST_CASE(return1);
TEST_CASE(return2);
TEST_CASE(return3);
TEST_CASE(return4);
// General tests: variable type, allocation type, etc
TEST_CASE(test1);
TEST_CASE(test2);
TEST_CASE(test3); // #3954 - reference pointer
// Execution reaches a 'throw'
TEST_CASE(throw1);
// Possible leak => Further configuration is needed for complete analysis
TEST_CASE(configuration1);
TEST_CASE(configuration2);
TEST_CASE(configuration3);
TEST_CASE(configuration4);
TEST_CASE(ptrptr);
}
void check(const char code[]) {
// Clear the error buffer..
errout.str("");
// Tokenize..
Settings settings;
int id = 0;
while (!settings.library.ismemory(++id));
settings.library.setalloc("malloc",id);
settings.library.setdealloc("free",id);
while (!settings.library.isresource(++id));
settings.library.setalloc("fopen",id);
settings.library.setdealloc("fclose",id);
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.c");
tokenizer.simplifyTokenList2();
// Check for leaks..
CheckLeakAutoVar c;
settings.checkLibrary = true;
settings.addEnabled("information");
c.runSimplifiedChecks(&tokenizer, &settings, 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>/<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"
"}");
ASSERT_EQUALS("", 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 deallocuse2() {
check("void f(char *p) {\n"
" free(p);\n"
" strcpy(a, p);\n"
"}");
TODO_ASSERT_EQUALS("error (free,use)", "[test.c:3]: (information) --check-library: Function strcpy() should have <noreturn> configuration\n", errout.str());
check("void f(char *p) {\n" // #3041 - assigning pointer when it's used
" free(p);\n"
" strcpy(a, p=b());\n"
"}");
TODO_ASSERT_EQUALS("", "[test.c:3]: (information) --check-library: Function strcpy() should have <noreturn> configuration\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:3]: (error) Returning/dereferencing 'p' after it is deallocated / released\n", 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 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:6]: (error) Memory pointed to by 'p' is freed twice.\n", 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() { // #5451 - exit
check("void f(char *p) {\n"
" if (x) {\n"
" free(p);\n"
" exit(1);\n"
" }\n"
" free(p);\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"
"[test.c:4]: (information) --check-library: Function fatal_error() should have <use>/<ignore> configuration\n",
errout.str());
}
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 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("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 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 mismatch_fopen_free() {
check("void f() {\n"
" FILE*f=fopen(fname,a);\n"
" free(f);\n"
"}");
ASSERT_EQUALS("[test.c:3]: (error) Mismatching allocation and deallocation: f\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"
"}");
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"
"}");
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"
"}");
ASSERT_EQUALS("", errout.str());
}
void test1() { // 3809
check("void f(double*&p) {\n"
" p = malloc(0x100);\n"
"}");
ASSERT_EQUALS("", 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"
"};");
ASSERT_EQUALS("", errout.str());
}
void throw1() { // 3987 - Execution reach a 'throw'
check("void f() {\n"
" char *p = malloc(10);\n"
" throw 123;\n"
"}");
TODO_ASSERT_EQUALS("error", "", errout.str());
check("void f() {\n"
" char *p;\n"
" try {\n"
" p = malloc(10);\n"
" throw 123;\n"
" } catch (...) { }\n"
" free(p);\n"
"}");
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>/<ignore> configuration\n",
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>/<ignore> configuration\n",
errout.str());
}
void configuration3() {
check("void f() {\n"
" char *p = malloc(10);\n"
" if (set_data(p)) { }\n"
"}");
ASSERT_EQUALS("[test.c:4]: (information) --check-library: Function set_data() should have <use>/<ignore> configuration\n", errout.str());
check("void f() {\n"
" char *p = malloc(10);\n"
" if (set_data(p)) { return; }\n"
"}");
ASSERT_EQUALS("[test.c:3]: (information) --check-library: Function set_data() should have <use>/<ignore> configuration\n"
"[test.c:4]: (information) --check-library: Function set_data() should have <use>/<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>/<ignore> configuration\n", 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());
}
};
REGISTER_TEST(TestLeakAutoVar)