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

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Merged
merged 3 commits into from
Feb 8, 2023
Merged

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

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b5dc0dd
invalidate cache counter
kumaraditya303 Feb 8, 2023
60b1ec0
📜🤖 Added by blurb_it.
blurb-it[bot] Feb 8, 2023
c074ee1
Update Misc/NEWS.d/next/Core and Builtins/2023-02-08-17-13-31.gh-issu…
erlend-aasland Feb 8, 2023
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Core and Builtins/2023-02-08-17-13-31.gh-issue-101696.seJhTt.rst
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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.
2 changes: 2 additions & 0 deletions Objects/typeobject.c
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Expand Up @@ -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);
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