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Fix #14891 FP knownConditionTrueFalse (dereferencing pointer to array member) #8704

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Fix #14891 FP knownConditionTrueFalse (dereferencing pointer to array member) #8704

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9549ab6
Update vf_analyzers.cpp
chrchr-github Jul 7, 2026
232bbf4
Update testvalueflow.cpp
chrchr-github Jul 7, 2026
926fe38
Update vf_analyzers.cpp [skip ci]
chrchr-github Jul 13, 2026
076bafd
Update valueflow.cpp
chrchr-github Jul 13, 2026
ccd2c28
Update valueflow.cpp
chrchr-github Jul 13, 2026
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2 changes: 2 additions & 0 deletions lib/vf_analyzers.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -616,6 +616,8 @@ struct ValueFlowAnalyzer : Analyzer {
return Action::None;
Action la = analyzeLifetime(lifeTok);
if (la.matches()) {
if (tok->isUnaryOp("*") && tok->valueType() && lifeTok->valueType() && tok->valueType()->pointer < lifeTok->valueType()->pointer)
return Action::Invalid;
Action a = Action::Read;
if (isModified(tok).isModified())
a = Action::Invalid;
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9 changes: 9 additions & 0 deletions test/testvalueflow.cpp
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Expand Up @@ -9092,6 +9092,15 @@ class TestValueFlow : public TestFixture {
" return x;\n"
"}\n";
ASSERT_EQUALS(false, testValueOfX(code, 3U, "malloc(10)", 0));

code = "struct S {\n" // #14891
" void f() const {\n"
" const int* p = a;\n"
" if (*p) {}\n"
" }\n"
" int a[3];\n"
"};\n";
ASSERT(tokenValues(code, "* p )").empty());
}

void valueFlowSymbolicIdentity()
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