Joseph Qi
2013-Dec-27 02:27 UTC
[Ocfs2-devel] [PATCH] ocfs2: Fix NULL pointer dereference when dismount and ocfs2rec simultaneously
From: Yiwen Jiang <jiangyiwen at huawei.com>
2 nodes cluster, say Node A and Node B, mount the same ocfs2 volume,
and create a file 1.
Node A Node B
open 1, get open lock
rm 1, and then add 1 to orphan_dir
storage link down,
o2hb_write_timeout
->o2quo_disk_timeout
->emergency_restart
at the moment, Node B dismount and do
ocfs2rec simultaneously
1) ocfs2_dismount_volume
->ocfs2_recovery_exit
->wait_event(osb->recovery_event)
->flush_workqueue(ocfs2_wq)
2) ocfs2rec
->queue_work(&journal->j_recovery_work)
->ocfs2_recover_orphans
->ocfs2_commit_truncate
->queue_delayed_work(&osb->osb_truncate_log_wq)
In ocfs2_recovery_exit, it flushes workqueue and then releases system
inodes. When doing ocfs2rec, it will call ocfs2_flush_truncate_log
which will try to get sys_root_inode, and NULL pointer dereference
occurs.
Signed-off-by: Yiwen Jiang <jiangyiwen at huawei.com>
Signed-off-by: joyce <xuejiufei at huawei.com>
Signed-off-by: Joseph Qi <joseph.qi at huawei.com>
---
fs/ocfs2/super.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index c414929..665e91e 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -1947,11 +1947,15 @@ static void ocfs2_dismount_volume(struct super_block
*sb, int mnt_err)
ocfs2_shutdown_local_alloc(osb);
- ocfs2_truncate_log_shutdown(osb);
-
/* This will disable recovery and flush any recovery work. */
ocfs2_recovery_exit(osb);
+ /*
+ * During dismount, when it recovers another node it will call
+ * ocfs2_recover_orphans and queue delayed work osb_truncate_log_wq.
+ */
+ ocfs2_truncate_log_shutdown(osb);
+
ocfs2_journal_shutdown(osb);
ocfs2_sync_blockdev(sb);
--
1.8.4.3