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[3.14] gh-112127: Fix possible use-after-free in atexit.unregister() (GH-114092) (#142878)

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gh-112127: Fix possible use-after-free in atexit.unregister() (GH-114092)
(cherry picked from commit 2b466c47c3)

Co-authored-by: Benjamin Johnson <ben332004@gmail.com>
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
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Miss Islington (bot) 2025-12-17 17:06:12 +01:00 • committed by GitHub
parent 06137178b0
commit 8c92d665ee
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4 changed files with 18 additions and 1 deletions
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13
Lib/test/_test_atexit.py
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@ -135,6 +135,19 @@ def func():
finally:
atexit.unregister(func)
def test_eq_unregister_clear(self):
# Issue #112127: callback's __eq__ may call unregister or _clear
class Evil:
def __eq__(self, other):
action(other)
return NotImplemented
for action in atexit.unregister, lambda o: atexit._clear():
with self.subTest(action=action):
atexit.register(lambda: None)
atexit.unregister(Evil())
atexit._clear()
if __name__ == "__main__":
unittest.main()