ocfs2: fix locking for res->tracking and dlm->tracking_list
authorAshish Samant <ashish.samant@oracle.com>
Fri, 5 Oct 2018 22:52:15 +0000 (15:52 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 10 Oct 2018 06:54:28 +0000 (08:54 +0200)
commitde0e2a92ccc5460eb8dd115de891cde63ae552bf
treec7d5d239015e692b074345cc24c538bddbecb30e
parentf8566a92ab75d442a823453414c6158b0b3c5ce7
ocfs2: fix locking for res->tracking and dlm->tracking_list

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@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>
fs/ocfs2/dlm/dlmmaster.c