From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,T_DKIMWL_WL_HIGH,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8BAA4C28EBD for ; Sun, 9 Jun 2019 17:13:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 510D2205F4 for ; Sun, 9 Jun 2019 17:13:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560100405; bh=I6u1nRkixkWgd4+KBmT8cNxNPupYXx8ksFuELRXsnq4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=KQQ6xXChU9vE5u3ByuzYniq/xaXTMkDsopS7HyWOB3awB+pZnyZnvjMbnVQqM704i NjG8BLs7qjLOdaUOjdCBnAOviZVN2fLybJSoUKwQUVrgEdXKXu/TQftN/+eyHHOLBd ncnExT9fELoFLUud4Z0Y2FNMmVWKtcTsvHU8HCGs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388711AbfFIRNY (ORCPT ); Sun, 9 Jun 2019 13:13:24 -0400 Received: from mail.kernel.org ([198.145.29.99]:33614 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730253AbfFIQ6W (ORCPT ); Sun, 9 Jun 2019 12:58:22 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 5AE2B206DF; Sun, 9 Jun 2019 16:58:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560099501; bh=I6u1nRkixkWgd4+KBmT8cNxNPupYXx8ksFuELRXsnq4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rsgOyt/dtpxpk2cGvud+RlsbOF55geb7Ly1JqlayGmY+z+FeQ7S2Utpx+1YjWKozt Krk0JTvKhaQZAa7L1SpcjHq6JqJ7xAzKPJ7nh/O4eclRPzrQfWl1HxcOfJh+EiL9Ju WBN4M26YwWuWl6d8mwJVSzd35YOgyG11GhdlIhII= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mikulas Patocka , Mike Snitzer Subject: [PATCH 4.4 063/241] dm delay: fix a crash when invalid device is specified Date: Sun, 9 Jun 2019 18:40:05 +0200 Message-Id: <20190609164149.602243307@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190609164147.729157653@linuxfoundation.org> References: <20190609164147.729157653@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Mikulas Patocka commit 81bc6d150ace6250503b825d9d0c10f7bbd24095 upstream. When the target line contains an invalid device, delay_ctr() will call delay_dtr() with NULL workqueue. Attempting to destroy the NULL workqueue causes a crash. Signed-off-by: Mikulas Patocka Cc: stable@vger.kernel.org Signed-off-by: Mike Snitzer Signed-off-by: Greg Kroah-Hartman --- drivers/md/dm-delay.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/md/dm-delay.c +++ b/drivers/md/dm-delay.c @@ -222,7 +222,8 @@ static void delay_dtr(struct dm_target * { struct delay_c *dc = ti->private; - destroy_workqueue(dc->kdelayd_wq); + if (dc->kdelayd_wq) + destroy_workqueue(dc->kdelayd_wq); dm_put_device(ti, dc->dev_read);