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[2620:137:e000::1:20]) by mx.google.com with ESMTP id ep21-20020a1709069b5500b009094a93d9b7si693008ejc.990.2023.04.12.20.44.06; Wed, 12 Apr 2023 20:44:30 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@163.com header.s=s110527 header.b=Z4NDFiWA; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=163.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229720AbjDMDfB (ORCPT + 99 others); Wed, 12 Apr 2023 23:35:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50118 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229870AbjDMDeh (ORCPT ); Wed, 12 Apr 2023 23:34:37 -0400 Received: from m12.mail.163.com (m12.mail.163.com [220.181.12.216]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 9510772BB; Wed, 12 Apr 2023 20:34:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:Subject:Date:Message-Id:MIME-Version; bh=lIcVf dDOG5loBmiWhCLSBqSRWz3dIU8sdeChu5hTPJE=; b=Z4NDFiWAEX/oY3sAbcKf8 f/uZQI44HOhZ+dKeMudg4EHiU4h8+fBE9LtBSVGtKEQjZpcQyUjLXLS9bvo0nsqZ p2I1uIfe7I++JOkWrWfRjj4aXt5GRC51tcJ3b/e/uK5rW+axmzlGOUd2UsiQqxPI v43chJJnWtRddW+1vkA4ik= Received: from leanderwang-LC2.localdomain (unknown [111.206.145.21]) by zwqz-smtp-mta-g2-4 (Coremail) with SMTP id _____wBXFM0_eDdkjKocBQ--.60991S2; Thu, 13 Apr 2023 11:34:23 +0800 (CST) From: Zheng Wang To: njavali@marvell.com Cc: mrangankar@marvell.com, GR-QLogic-Storage-Upstream@marvell.com, jejb@linux.ibm.com, martin.petersen@oracle.com, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, hackerzheng666@gmail.com, 1395428693sheep@gmail.com, alex000young@gmail.com, Zheng Wang Subject: [PATCH v2] scsi: qedi: Fix use after free bug in qedi_remove due to race condition Date: Thu, 13 Apr 2023 11:34:22 +0800 Message-Id: <20230413033422.28003-1-zyytlz.wz@163.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-CM-TRANSID: _____wBXFM0_eDdkjKocBQ--.60991S2 X-Coremail-Antispam: 1Uf129KBjvJXoW7Kw17Gry3WFWUtFWUWr4UArb_yoW8Wr48pr ZxGa4Fkw45KFyrXFn8JF10qFy0kayDtFW0ga97W3y7X3Wa93ykZFySka4jgFyUJFs2va17 tF1kXFy3W3WDGaDanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x0zimFAAUUUUU= X-Originating-IP: [111.206.145.21] X-CM-SenderInfo: h2113zf2oz6qqrwthudrp/1tbiQgRPU1aEE9wfvgACsk X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM,RCVD_IN_MSPIKE_H2, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1763031091544348047?= X-GMAIL-MSGID: =?utf-8?q?1763031091544348047?= In qedi_probe, it calls __qedi_probe, which bound &qedi->recovery_work with qedi_recovery_handler and bound &qedi->board_disable_work with qedi_board_disable_work. When it calls qedi_schedule_recovery_handler, it will finally call schedule_delayed_work to start the work. When we call qedi_remove to remove the driver, there may be a sequence as follows: Fix it by finishing the work before cleanup in qedi_remove. CPU0 CPU1 |qedi_recovery_handler qedi_remove | __qedi_remove | iscsi_host_free | scsi_host_put | //free shost | |iscsi_host_for_each_session |//use qedi->shost Fixes: 4b1068f5d74b ("scsi: qedi: Add MFW error recovery process") Signed-off-by: Zheng Wang Acked-by: Manish Rangankar Reviewed-by: Mike Christie --- v2: - remove unnecessary comment suggested by Mike Christie and cancel the work after qedi_ops->stop and qedi_ops->ll2->stop which ensure there is no more work suggested by Manish Rangankar --- drivers/scsi/qedi/qedi_main.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/scsi/qedi/qedi_main.c b/drivers/scsi/qedi/qedi_main.c index f2ee49756df8..45d359554182 100644 --- a/drivers/scsi/qedi/qedi_main.c +++ b/drivers/scsi/qedi/qedi_main.c @@ -2450,6 +2450,9 @@ static void __qedi_remove(struct pci_dev *pdev, int mode) qedi_ops->ll2->stop(qedi->cdev); } + cancel_delayed_work_sync(&qedi->recovery_work); + cancel_delayed_work_sync(&qedi->board_disable_work); + qedi_free_iscsi_pf_param(qedi); rval = qedi_ops->common->update_drv_state(qedi->cdev, false);