gfs2: fix an oops in gfs2_permission

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[ Upstream commit 0abd1557e2 ]

In RCU mode, we might race with gfs2_evict_inode(), which zeroes
->i_gl.  Freeing of the object it points to is RCU-delayed, so
if we manage to fetch the pointer before it's been replaced with
NULL, we are fine.  Check if we'd fetched NULL and treat that
as "bail out and tell the caller to get out of RCU mode".

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Al Viro 2023-10-02 03:33:44 +01:00 • committed by Greg Kroah-Hartman

parent 53fc16c1ad

commit e2ccedd4d1

2 changed files with 10 additions and 3 deletions

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11

fs/gfs2/inode.c

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2

fs/gfs2/super.c

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