NFSD: fix use-after-free in __nfs42_ssc_open()

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[ Upstream commit 75333d48f9 ]

Problem caused by source's vfsmount being unmounted but remains
on the delayed unmount list. This happens when nfs42_ssc_open()
return errors.

Fixed by removing nfsd4_interssc_connect(), leave the vfsmount
for the laundromat to unmount when idle time expires.

We don't need to call nfs_do_sb_deactive when nfs42_ssc_open
return errors since the file was not opened so nfs_server->active
was not incremented. Same as in nfsd4_copy, if we fail to
launch nfsd4_do_async_copy thread then there's no need to
call nfs_do_sb_deactive

Reported-by: Xingyuan Mo <hdthky0@gmail.com>
Signed-off-by: Dai Ngo <dai.ngo@oracle.com>
Tested-by: Xingyuan Mo <hdthky0@gmail.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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This commit is contained in:

Dai Ngo 2022-12-12 14:50:11 -08:00 • committed by Greg Kroah-Hartman

parent ba50fee6b4

commit 650b69b17c

1 changed files with 5 additions and 15 deletions

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fs/nfsd/nfs4proc.c

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