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Fix #9635 (FP: Memory leak with comma operator in if-statement) 

When checking for comparisons in if-statements, if there are comma
operators in the if-statement, skip until after the last comma.
This commit is contained in:
Rikard Falkeborn 2020-07-09 21:13:54 +02:00
parent 0c6aabe444
commit 1e679cc5d1
2 changed files with 26 additions and 1 deletions
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6
lib/checkleakautovar.cpp
View File

@ -465,7 +465,11 @@ void CheckLeakAutoVar::checkScope(const Token * const startToken,
// Recursively scan variable comparisons in condition
std::stack<const Token *> tokens;
tokens.push(tok->next()->astOperand2());
// Skip expressions before commas
const Token * astOperand2AfterCommas = tok->next()->astOperand2();
while (Token::simpleMatch(astOperand2AfterCommas, ","))
astOperand2AfterCommas = astOperand2AfterCommas->astOperand2();
tokens.push(astOperand2AfterCommas);
while (!tokens.empty()) {
const Token *tok3 = tokens.top();
tokens.pop();

21
test/testleakautovar.cpp
View File

@ -134,6 +134,7 @@ private:
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)
// switch
TEST_CASE(switch1);
@ -1484,6 +1485,26 @@ private:
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 switch1() {
check("void f() {\n"
" char *p = 0;\n"