8000 gh-126703: Fix possible use after free in pycfunction freelist by Fidget-Spinner · Pull Request #132319 · python/cpython · GitHub
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gh-126703: Fix possible use after free in pycfunction freelist #132319

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Merged
merged 4 commits into from
Apr 9, 2025
Merged

gh-126703: Fix possible use after free in pycfunction freelist #132319

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c68d4f1
Fix possible use after free in pycfunction freelist
Fidget-Spinner Apr 9, 2025
4fa1daf
📜🤖 Added by blurb_it.
blurb-it[bot] Apr 9, 2025
088d3a4
Address review
Fidget-Spinner Apr 9, 2025
7125b6a
Merge branch 'freelist-fix' of github.com:Fidget-Spinner/cpython into…
Fidget-Spinner Apr 9, 2025
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@Fidget-Spinner
Fidget-Spinner committed Apr 9, 2025
commit 088d3a4ef47d15bba282c572ebac5f7ff02ad293
2 changes: 1 addition & 1 deletion Objects/methodobject.c
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Expand Up @@ -174,7 +174,7 @@ meth_dealloc(PyObject *self)
PyObject_ClearWeakRefs((PyObject*) m);
}
// We need to access ml_flags here rather than later.
// `m` might have the same lifetime
// `m->m_ml` might have the same lifetime
// as `m_self` when it's dynamically allocated.
int ml_flags = m->m_ml->ml_flags;
// Dereference class before m_self: PyCFunction_GET_CLASS accesses
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