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Fix #13797 FN nullPointer with negated if-condition (regression) #8172

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Merged
chrchr-github merged 5 commits into from
Feb 10, 2026
Merged

Fix #13797 FN nullPointer with negated if-condition (regression) #8172

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a5442c8
Update vf_analyzers.cpp
chrchr-github Jan 30, 2026
8004db4
Update testnullpointer.cpp
chrchr-github Jan 30, 2026
7eeb427
Update testnullpointer.cpp
chrchr-github Jan 30, 2026
91161ab
Fix warnings
web-flow Jan 30, 2026
34de8aa
Adjust test
web-flow Jan 30, 2026
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2 changes: 1 addition & 1 deletion lib/vf_analyzers.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -139,7 +139,7 @@ struct ValueFlowAnalyzer : Analyzer {
return result;
}
ConditionState lhs = analyzeCondition(tok->astOperand1(), depth - 1);
if (lhs.isUnknownDependent())
if (lhs.isUnknownDependent() || !tok->astOperand2())
return lhs;
ConditionState rhs = analyzeCondition(tok->astOperand2(), depth - 1);
if (rhs.isUnknownDependent())
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12 changes: 11 additions & 1 deletion test/testnullpointer.cpp
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Expand Up @@ -2458,6 +2458,14 @@ class TestNullPointer : public TestFixture {
" if (h(i) && *i == 1) {}\n"
"}\n");
ASSERT_EQUALS("", errout_str());

check("void f(int i) {\n" // #13797
" int* p = nullptr;\n"
" if (!i) {\n"
" *p = 0;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4:10]: (error) Null pointer dereference: p [nullPointer]\n", errout_str());
}

void nullpointer78() // #7802
Expand Down Expand Up @@ -3929,7 +3937,9 @@ class TestNullPointer : public TestFixture {
" std::string s(p);\n"
" return s;\n"
"}\n", dinit(CheckOptions, $.inconclusive = true));
ASSERT_EQUALS("", errout_str());
TODO_ASSERT_EQUALS("",
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"[test.cpp:6:17]: (warning, inconclusive) Possible null pointer dereference: p [nullPointer]\n",
errout_str());

check("void f() {\n" // #11078
" const char* p = nullptr;\n"
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