From: Jan Kara <jack@suse.cz>
Date: Thu, 30 Jul 2009 15:01:53 +0000 (+0200)
Subject: ocfs2: Don't oops in ocfs2_kill_sb on a failed mount
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=5fd131893793;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

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>
---

diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index b0ee0fdf799a..a3f8871d21fd 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);
 }