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Fix #409 (fuzzing crash in simplecpp::Macro::expandToken()) #412

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Merged
merged 1 commit into from
Feb 12, 2025
Merged

Fix #409 (fuzzing crash in simplecpp::Macro::expandToken()) #412

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2 changes: 1 addition & 1 deletion simplecpp.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2125,7 +2125,7 @@ namespace simplecpp {
if (expandArg(&temp, defToken, parametertokens))
macroName = temp.cback()->str();
if (expandArg(&temp, defToken->next->next->next, parametertokens))
macroName += temp.cback()->str();
macroName += temp.cback() ? temp.cback()->str() : "";
else
macroName += defToken->next->next->next->str();
lastToken = defToken->next->next->next;
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12 changes: 12 additions & 0 deletions test.cpp
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Expand Up @@ -1717,6 +1717,17 @@ static void ifDefinedHashHash()
ASSERT_EQUALS("file0,4,#error,#error FOO is enabled\n", toString(outputList));
}

static void ifDefinedHashHash2()
{
// #409
// do not crash when expanding P() (as ## rhs is "null")
// note: gcc outputs "defined E"
const char code[] = "#define P(p)defined E##p\n"
"P()\n";
simplecpp::OutputList outputList;
ASSERT_EQUALS("\n0", preprocess(code, &outputList));
}

static void ifLogical()
{
const char code[] = "#if defined(A) || defined(B)\n"
Expand Down Expand Up @@ -3149,6 +3160,7 @@ int main(int argc, char **argv)
TEST_CASE(ifDefinedInvalid1);
TEST_CASE(ifDefinedInvalid2);
TEST_CASE(ifDefinedHashHash);
TEST_CASE(ifDefinedHashHash2);
TEST_CASE(ifLogical);
TEST_CASE(ifSizeof);
TEST_CASE(elif);
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