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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 304D0C77B75 for ; Mon, 15 May 2023 16:48:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242989AbjEOQsc (ORCPT ); Mon, 15 May 2023 12:48:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53514 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243027AbjEOQs2 (ORCPT ); Mon, 15 May 2023 12:48:28 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D3BB14EE0 for ; Mon, 15 May 2023 09:48:17 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 6BC406293C for ; Mon, 15 May 2023 16:48:17 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 47D1FC433EF; Mon, 15 May 2023 16:48:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1684169296; bh=Z5nvmuWjD93nU6MrRfTc/LCR9a3YHv8eUz1pCtH2154=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZXRzpZ9x+gQUiG2ZGxKku1icqqnMJ0IFN5rgNNNOy9FE67JThBtPRz7quWADNhYKO hXleMDDmVcvjoUl6lSuRA811vp79F1QpC02I65MTbNPQgFBVs6LvdbMdimEXU9M72u hFStYYQGIHqsIflWWEmTlY0Apb+kirn4Qkfwdn3E= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Zheng Wang , Manish Rangankar , Mike Christie , "Martin K. Petersen" , Sasha Levin Subject: [PATCH 6.3 014/246] scsi: qedi: Fix use after free bug in qedi_remove() Date: Mon, 15 May 2023 18:23:46 +0200 Message-Id: <20230515161723.040854366@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230515161722.610123835@linuxfoundation.org> References: <20230515161722.610123835@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Zheng Wang [ Upstream commit c5749639f2d0a1f6cbe187d05f70c2e7c544d748 ] In qedi_probe() we call __qedi_probe() which initializes &qedi->recovery_work with qedi_recovery_handler() and &qedi->board_disable_work with qedi_board_disable_work(). When qedi_schedule_recovery_handler() is called, schedule_delayed_work() will finally start the work. In qedi_remove(), which is called to remove the driver, the following sequence may be observed: Fix this 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 Cancel recovery_work and board_disable_work in __qedi_remove(). Fixes: 4b1068f5d74b ("scsi: qedi: Add MFW error recovery process") Signed-off-by: Zheng Wang Link: https://lore.kernel.org/r/20230413033422.28003-1-zyytlz.wz@163.com Acked-by: Manish Rangankar Reviewed-by: Mike Christie Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- 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 f2ee49756df8d..45d3595541820 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); -- 2.39.2