4.9-stable review patch. If anyone has any objections, please let me know.
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From: Ashish Samant ashish.samant@oracle.com
commit cbe355f57c8074bc4f452e5b6e35509044c6fa23 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@orac... 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
--- fs/ocfs2/dlm/dlmmaster.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/fs/ocfs2/dlm/dlmmaster.c +++ b/fs/ocfs2/dlm/dlmmaster.c @@ -589,9 +589,9 @@ 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));