ocfs2: Don't oops in ocfs2_kill_sb on a failed mount

If we fail to mount the filesystem, we have to be careful not to dereference
uninitialized structures in ocfs2_kill_sb.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Joel Becker <joel.becker@oracle.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index b0ee0fdf799..a3f8871d21f 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -1218,13 +1218,17 @@ static void ocfs2_kill_sb(struct super_block *sb)
 {
         struct ocfs2_super *osb = OCFS2_SB(sb);
 
+        /* Failed mount? */
+        if (!osb || atomic_read(&osb->vol_state) == VOLUME_DISABLED)
+                goto out;
+
         /* Prevent further queueing of inode drop events */
         spin_lock(&dentry_list_lock);
         ocfs2_set_osb_flag(osb, OCFS2_OSB_DROP_DENTRY_LOCK_IMMED);
         spin_unlock(&dentry_list_lock);
         /* Wait for work to finish and/or remove it */
         cancel_work_sync(&osb->dentry_lock_work);
-
+out:
         kill_block_super(sb);
 }