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| author | alex chen <alex.chen@huawei.com> | 2015-04-15 00:43:49 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-04-15 01:48:58 +0200 |
| commit | 2f2eca20a09dac0e9d62bf57ce6a0c6ef6cf91e6 (patch) | |
| tree | 481e731e8379647344f431c7b72c7ac15f46b984 /fs/ocfs2/dlmglue.c | |
| parent | ocfs2: logging: remove static buffer, use vsprintf extension %pV (diff) | |
| download | linux-2f2eca20a09dac0e9d62bf57ce6a0c6ef6cf91e6.tar.xz linux-2f2eca20a09dac0e9d62bf57ce6a0c6ef6cf91e6.zip | |
ocfs2: check if the ocfs2 lock resource has been initialized before calling ocfs2_dlm_lock
If ocfs2 lockres has not been initialized before calling ocfs2_dlm_lock,
the lock won't be dropped and then will lead umount hung. The case is
described below:
ocfs2_mknod
ocfs2_mknod_locked
__ocfs2_mknod_locked
ocfs2_journal_access_di
Failed because of -ENOMEM or other reasons, the inode lockres
has not been initialized yet.
iput(inode)
ocfs2_evict_inode
ocfs2_delete_inode
ocfs2_inode_lock
ocfs2_inode_lock_full_nested
__ocfs2_cluster_lock
Succeeds and allocates a new dlm lockres.
ocfs2_clear_inode
ocfs2_open_unlock
ocfs2_drop_inode_locks
ocfs2_drop_lock
Since lockres has not been initialized, the lock
can't be dropped and the lockres can't be
migrated, thus umount will hang forever.
Signed-off-by: Alex Chen <alex.chen@huawei.com>
Reviewed-by: Joseph Qi <joseph.qi@huawei.com>
Reviewed-by: joyce.xue <xuejiufei@huawei.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ocfs2/dlmglue.c')
| -rw-r--r-- | fs/ocfs2/dlmglue.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c index 23adcbf374d3..956edf67be20 100644 --- a/fs/ocfs2/dlmglue.c +++ b/fs/ocfs2/dlmglue.c @@ -1391,6 +1391,11 @@ static int __ocfs2_cluster_lock(struct ocfs2_super *osb, int noqueue_attempted = 0; int dlm_locked = 0; + if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED)) { + mlog_errno(-EINVAL); + return -EINVAL; + } + ocfs2_init_mask_waiter(&mw); if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) |