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ocfs2: fix locking for res->tracking and dlm->tracking_list 

commit cbe355f57c upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Ashish Samant 2018-10-05 15:52:15 -07:00 committed by Greg Kroah-Hartman
parent f8566a92ab
commit de0e2a92cc
1 changed files with 2 additions and 2 deletions
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4
fs/ocfs2/dlm/dlmmaster.c
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@ -589,9 +589,9 @@ static void dlm_init_lockres(struct dlm_ctxt *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));