Fix #12512 fuzzing timeout in compileExpression() (#6160)

danmar · Mar 20, 2024 · 63eac64 · 63eac64
1 parent c98029b
commit 63eac64
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diff --git a/lib/tokenlist.cpp b/lib/tokenlist.cpp
@@ -1758,7 +1758,10 @@ static Token * createAstAtToken(Token *tok)
 void TokenList::createAst() const
 {
     for (Token *tok = mTokensFrontBack.front; tok; tok = tok ? tok->next() : nullptr) {
-        tok = createAstAtToken(tok);
+        Token* const nextTok = createAstAtToken(tok);
+        if (precedes(nextTok, tok))
+            throw InternalError(tok, "Syntax Error: Infinite loop when creating AST.", InternalError::AST);
+        tok = nextTok;
     }
 }
 

diff --git a/test/cli/fuzz-timeout/timeout-0ee5eed9abd34e9d23640a5b82dd724affd05b79 b/test/cli/fuzz-timeout/timeout-0ee5eed9abd34e9d23640a5b82dd724affd05b79
@@ -0,0 +1 @@
+;new t()