gfs2: Fix unlikely race in gdlm_put_lock

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[ Upstream commit 28c4d9bc07 ]

In gdlm_put_lock(), there is a small window of time in which the
DFL_UNMOUNT flag has been set but the lockspace hasn't been released,
yet.  In that window, dlm may still call gdlm_ast() and gdlm_bast().
To prevent it from dereferencing freed glock objects, only free the
glock if the lockspace has actually been released.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Andrew Price <anprice@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Andreas Gruenbacher 2025-08-06 23:34:03 +02:00 • committed by Greg Kroah-Hartman

parent d35ed24aff

commit 64c61b4ac6

1 changed files with 5 additions and 6 deletions

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fs/gfs2/lock_dlm.c

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