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| author | Pavel Machek <pavel@ucw.cz> | 2020-08-06 23:18:09 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-08-19 08:16:21 +0200 |
| commit | 50abf1b9ad1072fc96f6371bc8e19cecd6420b87 (patch) | |
| tree | e894045db9a313bf263d5d730dab1216f4a2fcff | |
| parent | ba8a7219334646651b470a7509c09ffab1d4707e (diff) | |
| download | linux-stable-50abf1b9ad1072fc96f6371bc8e19cecd6420b87.tar.gz linux-stable-50abf1b9ad1072fc96f6371bc8e19cecd6420b87.tar.bz2 linux-stable-50abf1b9ad1072fc96f6371bc8e19cecd6420b87.zip | |
ocfs2: fix unbalanced locking
[ Upstream commit 57c720d4144a9c2b88105c3e8f7b0e97e4b5cc93 ]
Based on what fails, function can return with nfs_sync_rwlock either
locked or unlocked. That can not be right.
Always return with lock unlocked on error.
Fixes: 4cd9973f9ff6 ("ocfs2: avoid inode removal while nfsd is accessing it")
Signed-off-by: Pavel Machek (CIP) <pavel@denx.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Link: http://lkml.kernel.org/r/20200724124443.GA28164@duo.ucw.cz
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | fs/ocfs2/dlmglue.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c index e2c34c704185..50a863fc1779 100644 --- a/fs/ocfs2/dlmglue.c +++ b/fs/ocfs2/dlmglue.c @@ -2871,9 +2871,15 @@ int ocfs2_nfs_sync_lock(struct ocfs2_super *osb, int ex) status = ocfs2_cluster_lock(osb, lockres, ex ? LKM_EXMODE : LKM_PRMODE, 0, 0); - if (status < 0) + if (status < 0) { mlog(ML_ERROR, "lock on nfs sync lock failed %d\n", status); + if (ex) + up_write(&osb->nfs_sync_rwlock); + else + up_read(&osb->nfs_sync_rwlock); + } + return status; } |