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[3.11] gh-116773: Fix overlapped memory corruption crash (GH-116774) (#117077)

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Manual backport of gh-116774.
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jkriegshauser 2024-03-20 13:10:32 -07:00 • committed by GitHub
parent 7eedaf4a86
commit 23a1c9f422
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4 changed files with 70 additions and 11 deletions
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14
Lib/asyncio/windows_events.py
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@ -323,13 +323,13 @@ class ProactorEventLoop(proactor_events.BaseProactorEventLoop):
if self._self_reading_future is not None:
ov = self._self_reading_future._ov
self._self_reading_future.cancel()
# self_reading_future was just cancelled so if it hasn't been
# finished yet, it never will be (it's possible that it has
# already finished and its callback is waiting in the queue,
# where it could still happen if the event loop is restarted).
# Unregister it otherwise IocpProactor.close will wait for it
# forever
if ov is not None:
# self_reading_future always uses IOCP, so even though it's
# been cancelled, we need to make sure that the IOCP message
# is received so that the kernel is not holding on to the
# memory, possibly causing memory corruption later. Only
# unregister it if IO is complete in all respects. Otherwise
# we need another _poll() later to complete the IO.
if ov is not None and not ov.pending:
self._proactor._unregister(ov)
self._self_reading_future = None