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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 42BAAC10F14 for ; Thu, 3 Oct 2019 17:34:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1CE5B20830 for ; Thu, 3 Oct 2019 17:34:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570124045; bh=pli4rmXhq7FOXLXjYFY5y1FXKnIqmfVOfCt3zRgefls=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Pp98HYnvpldYFo9swql7yLDCA7kMN2p0wemwvnBnBPxaYnCVfK6jatBEHr5c7EPin 8RZh41oz9R60QqhCisN/FtU+Sb2LL/vFUBqcW3gtoZlOEEwgVtoVh1NhMBCRP0kyk6 GV2+TRPEU9UFAIf4Jjk7VZYwUuwbbvaYTV51lxac= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732887AbfJCQHJ (ORCPT ); Thu, 3 Oct 2019 12:07:09 -0400 Received: from mail.kernel.org ([198.145.29.99]:54800 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732886AbfJCQHJ (ORCPT ); Thu, 3 Oct 2019 12:07:09 -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 DDAB4222BE; Thu, 3 Oct 2019 16:07:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570118828; bh=pli4rmXhq7FOXLXjYFY5y1FXKnIqmfVOfCt3zRgefls=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jFzBVGKBhqzCJ819X2ZkpAok9KkVANOC+xFX1hNThaxwD/tw1w8+PRNxI/vGkwP9C x0NimacNl1I6rSMSVl1FinjmYuYsRFjBImxGTfTnu9UZftjpHJfWO9+C3UsMUIgVYc 55vlJYh+JBCMxWq25bFf55+waHqiXUDusmZbsNmw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ming Lei , zhengbin , Jens Axboe , Sasha Levin Subject: [PATCH 4.14 024/185] blk-mq: move cancel of requeue_work to the front of blk_exit_queue Date: Thu, 3 Oct 2019 17:51:42 +0200 Message-Id: <20191003154443.250657845@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191003154437.541662648@linuxfoundation.org> References: <20191003154437.541662648@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: zhengbin [ Upstream commit e26cc08265dda37d2acc8394604f220ef412299d ] blk_exit_queue will free elevator_data, while blk_mq_requeue_work will access it. Move cancel of requeue_work to the front of blk_exit_queue to avoid use-after-free. blk_exit_queue blk_mq_requeue_work __elevator_exit blk_mq_run_hw_queues blk_mq_exit_sched blk_mq_run_hw_queue dd_exit_queue blk_mq_hctx_has_pending kfree(elevator_data) blk_mq_sched_has_work dd_has_work Fixes: fbc2a15e3433 ("blk-mq: move cancel of requeue_work into blk_mq_release") Cc: stable@vger.kernel.org Reviewed-by: Ming Lei Signed-off-by: zhengbin Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- block/blk-mq.c | 2 -- block/blk-sysfs.c | 3 +++ 2 files changed, 3 insertions(+), 2 deletions(-) diff --git a/block/blk-mq.c b/block/blk-mq.c index 55139d2fca3e0..eac4448047366 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -2294,8 +2294,6 @@ void blk_mq_release(struct request_queue *q) struct blk_mq_hw_ctx *hctx; unsigned int i; - cancel_delayed_work_sync(&q->requeue_work); - /* hctx kobj stays in hctx */ queue_for_each_hw_ctx(q, hctx, i) { if (!hctx) diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index e54be402899da..9caf96c2c1081 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -811,6 +811,9 @@ static void __blk_release_queue(struct work_struct *work) blk_free_queue_stats(q->stats); + if (q->mq_ops) + cancel_delayed_work_sync(&q->requeue_work); + blk_exit_rl(q, &q->root_rl); if (q->queue_tags) -- 2.20.1