eventpoll: defer struct eventpoll free to RCU grace period

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[ Upstream commit 07712db808 ]

In certain situations, ep_free() in eventpoll.c will kfree the epi->ep
eventpoll struct while it still being used by another concurrent thread.
Defer the kfree() to an RCU callback to prevent UAF.

Fixes: f2e467a482 ("eventpoll: Fix semi-unbounded recursion")
Signed-off-by: Nicholas Carlini <nicholas@carlini.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Nicholas Carlini 2026-03-31 15:25:32 +02:00 • committed by Greg Kroah-Hartman

parent f2451def09

commit 902120be4f

1 changed files with 5 additions and 1 deletions

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fs/eventpoll.c

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