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GH-101696: invalidate type version tag in _PyStaticType_Dealloc (#101697)

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Kumar Aditya 2023-02-08 23:32:15 +05:30 • committed by GitHub
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Misc/NEWS.d/next/Core and Builtins/2023-02-08-17-13-31.gh-issue-101696.seJhTt.rst Normal file
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@ -0,0 +1 @@
Invalidate type version tag in ``_PyStaticType_Dealloc`` for static types, avoiding bug where a false cache hit could crash the interpreter. Patch by Kumar Aditya.

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Objects/typeobject.c
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@ -4469,6 +4469,8 @@ _PyStaticType_Dealloc(PyTypeObject *type)
}
type->tp_flags &= ~Py_TPFLAGS_READY;
type->tp_flags &= ~Py_TPFLAGS_VALID_VERSION_TAG;
type->tp_version_tag = 0;
if (type->tp_flags & _Py_TPFLAGS_STATIC_BUILTIN) {
_PyStaticType_ClearWeakRefs(type);