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Fix #14918: fuzzing crash (stack-overflow) in findTokensSkipDeadCodeImpl() #8732

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Fix #14918: fuzzing crash (stack-overflow) in findTokensSkipDeadCodeImpl() #8732

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f9b11df
add crash file
ludviggunne Jul 15, 2026
3cbcc32
fix
ludviggunne Jul 15, 2026
7cfa61f
Refactor
ludviggunne Jul 23, 2026
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3 changes: 3 additions & 0 deletions lib/tokenize.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -8810,6 +8810,9 @@ void Tokenizer::findGarbageCode() const
if (!cpp || mSettings.standards.cpp < Standards::CPP20 || !Token::Match(tok->previous(), "%name% : %num% ="))
syntaxError(tok, tok->strAt(1) + " " + tok->strAt(2));
}
else if (!cpp && Token::Match(tok, "++|-- ++|--")) {
syntaxError(tok, tok->str() + tok->strAt(1));

@danmar danmar Aug 3, 2026

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does this mean that we still crash for the fuzzer code if --language=c++ is used?

@ludviggunne ludviggunne Aug 3, 2026

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No, we already throw a syntax error for C++.

}
else if (Token::simpleMatch(tok, ") return") && !Token::Match(tok->link()->previous(), "if|while|for (")) {
if (tok->link()->previous() && tok->link()->previous()->isUpperCaseName())
unknownMacroError(tok->link()->previous());
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1 change: 1 addition & 0 deletions test/cli/fuzz-crash_c/crash-9feb09f580c0cf101456c6c650ab4193b1009d07
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@@ -0,0 +1 @@
d(){e?&d=d++++F:a}
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