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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"fuzzing crash in `simplecpp::preprocess()`","articleBody":"```cpp\n#if __has_include\u003c\n```\n\n```\nsimplecpp.cpp:3598:92: runtime error: member access within null pointer of type 'const struct Token'\n    #0 0x55fceeca28c5 in simplecpp::preprocess(simplecpp::TokenList\u0026, simplecpp::TokenList const\u0026, std::vector\u003cstd::__cxx11::basic_string\u003cchar, std::char_traits\u003cchar\u003e, std::allocator\u003cchar\u003e \u003e, std::allocator\u003cstd::__cxx11::basic_string\u003cchar, std::char_traits\u003cchar\u003e, std::allocator\u003cchar\u003e \u003e \u003e \u003e\u0026, simplecpp::FileDataCache\u0026, simplecpp::DUI const\u0026, std::__cxx11::list\u003csimplecpp::Output, std::allocator\u003csimplecpp::Output\u003e \u003e*, std::__cxx11::list\u003csimplecpp::MacroUsage, std::allocator\u003csimplecpp::MacroUsage\u003e \u003e*, std::__cxx11::list\u003csimplecpp::IfCond, std::allocator\u003csimplecpp::IfCond\u003e \u003e*) /home/user/CLionProjects/simplecpp/simplecpp.cpp:3598\n    #1 0x55fceec4a3c6 in main /home/user/CLionProjects/simplecpp/main.cpp:166\n    #2 0x7f1c5f827674  (/usr/lib/libc.so.6+0x27674) (BuildId: 4fe011c94a88e8aeb6f2201b9eb369f42b4a1e9e)\n    #3 0x7f1c5f827728 in __libc_start_main (/usr/lib/libc.so.6+0x27728) (BuildId: 4fe011c94a88e8aeb6f2201b9eb369f42b4a1e9e)\n    #4 0x55fceec4e9a4 in _start (/home/user/CLionProjects/simplecpp/simplecpp+0xd79a4) (BuildId: 76de9af1e4c2b89a0933e47a7a6cc01822313cff)\n```","author":{"url":"https://github.com/firewave","@type":"Person","name":"firewave"},"datePublished":"2025-09-24T05:26:10.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/546/simplecpp/issues/546"}