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Fixed #1151 (false positive: Data is allocated but not initialized)

This commit is contained in:
Daniel Marjamäki 2009-12-26 09:30:02 +01:00
parent ad8184f060
commit a82a085d10
2 changed files with 47 additions and 2 deletions
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42
lib/checkother.cpp
View File

@ -1324,7 +1324,7 @@ private:
const bool array;
bool alloc;
// p = malloc ..
static void alloc_pointer(std::list<ExecutionPath *> &checks, unsigned int varid)
{
std::list<ExecutionPath *>::const_iterator it;
@ -1339,6 +1339,39 @@ private:
}
}
// *p = ..
static void init_pointer(bool &foundError, std::list<ExecutionPath *> &checks, const Token *tok)
{
const unsigned int varid(tok->varId());
if (!varid)
return;
std::list<ExecutionPath *>::iterator it = checks.begin();
while (it != checks.end())
{
if (!(*it)->bailOut())
{
CheckUninitVar *c = dynamic_cast<CheckUninitVar *>(*it);
if (c && c->varId == varid)
{
if (c->alloc)
{
delete c;
checks.erase(it++);
continue;
}
else
{
use_pointer(foundError, checks, tok);
}
}
}
++it;
}
}
// free p;
static void dealloc_pointer(bool &foundError, std::list<ExecutionPath *> &checks, const Token *tok)
{
const unsigned int varid(tok->varId());
@ -1447,13 +1480,18 @@ private:
{
if (Token::Match(tok.tokAt(-2), "[;{}] *"))
{
use_pointer(foundError, checks, &tok);
if (Token::simpleMatch(tok.next(), "="))
init_pointer(foundError, checks, &tok);
else
use_pointer(foundError, checks, &tok);
return &tok;
}
if (Token::Match(tok.next(), "= malloc|kmalloc") || Token::simpleMatch(tok.next(), "= new char ["))
{
alloc_pointer(checks, tok.varId());
if (tok.tokAt(3)->str() == "(")
return tok.tokAt(3)->link();
}
else if (Token::simpleMatch(tok.previous(), ">>") || Token::simpleMatch(tok.next(), "="))

7
test/testother.cpp
View File

@ -1307,6 +1307,13 @@ private:
"};\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo(char *s)\n"
"{\n"
" char *a = malloc(100);\n"
" *a = *s;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// struct..
checkUninitVar("void f()\n"
"{\n"