From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:56484 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751454AbdBJNka (ORCPT ); Fri, 10 Feb 2017 08:40:30 -0500 Subject: Patch "dm rq: cope with DM device destruction while in dm_old_request_fn()" has been added to the 4.9-stable tree To: snitzer@redhat.com, gregkh@linuxfoundation.org Cc: , From: Date: Fri, 10 Feb 2017 14:36:00 +0100 Message-ID: <1486733760114182@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled dm rq: cope with DM device destruction while in dm_old_request_fn() to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: dm-rq-cope-with-dm-device-destruction-while-in-dm_old_request_fn.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From 4087a1fffe38106e10646606a27f10d40451862d Mon Sep 17 00:00:00 2001 From: Mike Snitzer Date: Wed, 25 Jan 2017 16:24:52 +0100 Subject: dm rq: cope with DM device destruction while in dm_old_request_fn() From: Mike Snitzer commit 4087a1fffe38106e10646606a27f10d40451862d upstream. Fixes a crash in dm_table_find_target() due to a NULL struct dm_table being passed from dm_old_request_fn() that races with DM device destruction. Reported-by: artem@flashgrid.io Signed-off-by: Mike Snitzer Signed-off-by: Greg Kroah-Hartman --- drivers/md/dm-rq.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/drivers/md/dm-rq.c +++ b/drivers/md/dm-rq.c @@ -804,6 +804,10 @@ static void dm_old_request_fn(struct req int srcu_idx; struct dm_table *map = dm_get_live_table(md, &srcu_idx); + if (unlikely(!map)) { + dm_put_live_table(md, srcu_idx); + return; + } ti = dm_table_find_target(map, pos); dm_put_live_table(md, srcu_idx); } Patches currently in stable-queue which might be from snitzer@redhat.com are queue-4.9/dm-rq-cope-with-dm-device-destruction-while-in-dm_old_request_fn.patch