Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755990AbdLOKhv (ORCPT ); Fri, 15 Dec 2017 05:37:51 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:34360 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755229AbdLOJrz (ORCPT ); Fri, 15 Dec 2017 04:47:55 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dave Jones , Tejun Heo , Sasha Levin Subject: [PATCH 4.4 053/105] workqueue: trigger WARN if queue_delayed_work() is called with NULL @wq Date: Fri, 15 Dec 2017 10:44:51 +0100 Message-Id: <20171215092308.640899082@linuxfoundation.org> X-Mailer: git-send-email 2.15.1 In-Reply-To: <20171215092305.994559179@linuxfoundation.org> References: <20171215092305.994559179@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1216 Lines: 36 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tejun Heo [ Upstream commit 637fdbae60d6cb9f6e963c1079d7e0445c86ff7d ] If queue_delayed_work() gets called with NULL @wq, the kernel will oops asynchronuosly on timer expiration which isn't too helpful in tracking down the offender. This actually happened with smc. __queue_delayed_work() already does several input sanity checks synchronously. Add NULL @wq check. Reported-by: Dave Jones Link: http://lkml.kernel.org/r/20170227171439.jshx3qplflyrgcv7@codemonkey.org.uk Signed-off-by: Tejun Heo Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- kernel/workqueue.c | 1 + 1 file changed, 1 insertion(+) --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -1479,6 +1479,7 @@ static void __queue_delayed_work(int cpu struct timer_list *timer = &dwork->timer; struct work_struct *work = &dwork->work; + WARN_ON_ONCE(!wq); WARN_ON_ONCE(timer->function != delayed_work_timer_fn || timer->data != (unsigned long)dwork); WARN_ON_ONCE(timer_pending(timer));