Double `Py_DECREF` on parent parser in `pyexpat.xmlparser.ExternalEntityParserCreate` error paths · Issue #145989 · python/cpython · GitHub

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Pull requests 2.6k

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extension-modulesC modules in the Modules dir

type-crashA hard crash of the interpreter, possibly with a core dump

https://github.com/python/cpython/blob/main/Modules/pyexpat.c#L1097

ExternalEntityParserCreate_impl() in Modules/pyexpat.c increments the parent parser's refcount early, stores it in new_parser->parent, then on three separate allocation failure paths does:

gh-145989: Fix double Py_DECREF in pyexpat ExternalEntityParserCreate #146017