+ ocfs2-fix-locking-for-res-tracking-and-dlm-tracking_list.patch added to -mm tree

[akpm@linux-foundation.org]

The patch titled
     Subject: ocfs2: fix locking for res->tracking and dlm->tracking_list
has been added to the -mm tree.  Its filename is
     ocfs2-fix-locking-for-res-tracking-and-dlm-tracking_list.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/ocfs2-fix-locking-for-res-tracking-and-dlm-tracking_list.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/ocfs2-fix-locking-for-res-tracking-and-dlm-tracking_list.patch

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------------------------------------------------------
From: Ashish Samant <ashish.samant@oracle.com>
Subject: ocfs2: fix locking for res->tracking and dlm->tracking_list

In dlm_init_lockres() we access and modify res->tracking and
dlm->tracking_list without holding dlm->track_lock.  This can cause list
corruptions and can end up in kernel panic.

Fix this by locking res->tracking and dlm->tracking_list with
dlm->track_lock instead of dlm->spinlock.

Link: http://lkml.kernel.org/r/1529951192-4686-1-git-send-email-ashish.samant@oracle.com
Signed-off-by: Ashish Samant <ashish.samant@oracle.com>
Reviewed-by: Changwei Ge <ge.changwei@h3c.com>
Acked-by: Joseph Qi <jiangqi903@gmail.com>
Acked-by: Jun Piao <piaojun@huawei.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <ge.changwei@h3c.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/ocfs2/dlm/dlmmaster.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/fs/ocfs2/dlm/dlmmaster.c~ocfs2-fix-locking-for-res-tracking-and-dlm-tracking_list
+++ a/fs/ocfs2/dlm/dlmmaster.c
@@ -584,9 +584,9 @@ static void dlm_init_lockres(struct dlm_
 
 	res->last_used = 0;
 
-	spin_lock(&dlm->spinlock);
+	spin_lock(&dlm->track_lock);
 	list_add_tail(&res->tracking, &dlm->tracking_list);
-	spin_unlock(&dlm->spinlock);
+	spin_unlock(&dlm->track_lock);
 
 	memset(res->lvb, 0, DLM_LVB_LEN);
 	memset(res->refmap, 0, sizeof(res->refmap));
_

Patches currently in -mm which might be from ashish.samant@oracle.com are

ocfs2-fix-locking-for-res-tracking-and-dlm-tracking_list.patch