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Check subtraction of pointers to different objects

This commit is contained in:
Paul Fultz II 2019-02-27 06:55:48 +01:00 committed by Daniel Marjamäki
parent 0e988cc755
commit e846312fed
2 changed files with 14 additions and 2 deletions
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7
lib/checkother.cpp
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@ -2864,7 +2864,7 @@ void CheckOther::checkComparePointers()
const SymbolDatabase *symbolDatabase = mTokenizer->getSymbolDatabase();
for (const Scope *functionScope : symbolDatabase->functionScopes) {
for (const Token *tok = functionScope->bodyStart; tok != functionScope->bodyEnd; tok = tok->next()) {
if (!Token::Match(tok, "<|>|<=|>="))
if (!Token::Match(tok, "<|>|<=|>=|-"))
continue;
const Token *tok1 = tok->astOperand1();
const Token *tok2 = tok->astOperand2();
@ -2892,6 +2892,9 @@ void CheckOther::checkComparePointers()
void CheckOther::comparePointersError(const Token *tok, const ValueFlow::Value *v1, const ValueFlow::Value *v2)
{
ErrorPath errorPath;
std::string verb = "Comparing";
if (Token::simpleMatch(tok, "-"))
verb = "Subtracting";
if (v1) {
errorPath.emplace_back(v1->tokvalue->variable()->nameToken(), "Variable declared here.");
errorPath.insert(errorPath.end(), v1->errorPath.begin(), v1->errorPath.end());
@ -2902,5 +2905,5 @@ void CheckOther::comparePointersError(const Token *tok, const ValueFlow::Value *
}
errorPath.emplace_back(tok, "");
reportError(
errorPath, Severity::error, "comparePointers", "Comparing pointers that point to different objects", CWE570, false);
errorPath, Severity::error, "comparePointers", verb + " pointers that point to different objects", CWE570, false);
}

9
test/testother.cpp
View File

@ -7663,6 +7663,15 @@ private:
"[test.cpp:1] -> [test.cpp:2] -> [test.cpp:1] -> [test.cpp:2] -> [test.cpp:2]: (error) Comparing pointers that point to different objects\n",
errout.str());
check("int f() {\n"
" int x = 0;\n"
" int y = 1;\n"
" return &x - &y;\n"
"}\n");
ASSERT_EQUALS(
"[test.cpp:2] -> [test.cpp:4] -> [test.cpp:3] -> [test.cpp:4] -> [test.cpp:4]: (error) Subtracting pointers that point to different objects\n",
errout.str());
check("bool f() {\n"
" int x[2] = {1, 2}m;\n"
" int* xp = &x[0];\n"