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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"fuzzing crash (stack-overflow) in `simplecpp::Macro::expandToken()`","articleBody":"```cpp\n#define f)g(\n#define g(x)g(g(g(x))\nf))))))))))))\n```\n\n```\nAddressSanitizer:DEADLYSIGNAL\n=================================================================\n==250913==ERROR: AddressSanitizer: stack-overflow on address 0x7ffd380f1ff8 (pc 0x7fa91bf3d167 bp 0x7ffd380f2\u003e\n    #0 0x7fa91bf3d167  (/usr/lib/libasan.so.8+0x13d167) (BuildId: ee5fbab73143ab257a66a33afe0f038a4af7a74e)\n    #1 0x7fa91bf2d370 in operator new(unsigned long) (/usr/lib/libasan.so.8+0x12d370) (BuildId: ee5fbab73143a\u003e\n    #2 0x559390b352f2 in std::__new_allocator\u003csimplecpp::Token const*\u003e::allocate(unsigned long, void const*) \u003e\n    #3 0x559390b352f2 in std::allocator_traits\u003cstd::allocator\u003csimplecpp::Token const*\u003e \u003e::allocate(std::alloc\u003e\n    #4 0x559390b352f2 in std::_Vector_base\u003csimplecpp::Token const*, std::allocator\u003csimplecpp::Token const*\u003e \u003e\u003e\n    #5 0x559390b352f2 in void std::vector\u003csimplecpp::Token const*, std::allocator\u003csimplecpp::Token const*\u003e \u003e:\u003e\n    #6 0x559390b35eb3 in void std::vector\u003csimplecpp::Token const*, std::allocator\u003csimplecpp::Token const*\u003e \u003e:\u003e\n    #7 0x559390b35eb3 in simplecpp::Macro::getMacroParameters(simplecpp::Token const*, bool) const /home/user\u003e\n    #8 0x559390b52e2a in simplecpp::Macro::expand(simplecpp::TokenList\u0026, simplecpp::Location const\u0026, simplecp\u003e\n    #9 0x559390b45e75 in simplecpp::Macro::expandArg(simplecpp::TokenList\u0026, simplecpp::Token const*, simplecp\u003e\n    #10 0x559390b48e15 in simplecpp::Macro::expandToken(simplecpp::TokenList\u0026, simplecpp::Location const\u0026, si\u003e\n[...]\n    #248 0x559390b5415b in simplecpp::Macro::expand(simplecpp::TokenList\u0026, simplecpp::Location const\u0026, simple\u003e\n    #249 0x559390b45e75 in simplecpp::Macro::expandArg(simplecpp::TokenList\u0026, simplecpp::Token const*, simple\u003e\n    #250 0x559390b48e15 in simplecpp::Macro::expandToken(simplecpp::TokenList\u0026, simplecpp::Location const\u0026, s\u003e\n\nSUMMARY: AddressSanitizer: stack-overflow /home/user/CLionProjects/simplecpp/simplecpp.cpp:1874 in simplecpp:\u003e\n==250913==ABORTING\n```","author":{"url":"https://github.com/firewave","@type":"Person","name":"firewave"},"datePublished":"2026-06-16T21:27:29.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/662/simplecpp/issues/662"}