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 82AE8C433FE for ; Mon, 21 Feb 2022 09:51:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1352131AbiBUJvO (ORCPT ); Mon, 21 Feb 2022 04:51:14 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:42464 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1351971AbiBUJqw (ORCPT ); Mon, 21 Feb 2022 04:46:52 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3305A26562; Mon, 21 Feb 2022 01:18:52 -0800 (PST) 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 C2C3160F4E; Mon, 21 Feb 2022 09:18:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id AA2B7C340EB; Mon, 21 Feb 2022 09:18:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1645435131; bh=jSX6Ft0yEbQig0uJNyduPU6XZS9xYQjm4RT3TZsxxsc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dBCJkN7friVKFYMH7WursAxEDJVe8Q56XTXpcTaDuilK45B/FTheNBxe/Z0MAx/oY TKH5wd2end1FX7ut/Pe6XDN3/H53FQYWuy8CVn2xsfJYwPuMAyZjQRLOoj4rA5T5rG K1Dk9toraFVXrPseN00/9lUI4YEyi19phSYF86E8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Damien Le Moal , Jack Wang , John Garry , "Martin K. Petersen" , Sasha Levin Subject: [PATCH 5.16 056/227] scsi: pm8001: Fix use-after-free for aborted TMF sas_task Date: Mon, 21 Feb 2022 09:47:55 +0100 Message-Id: <20220221084936.739780050@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220221084934.836145070@linuxfoundation.org> References: <20220221084934.836145070@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: John Garry [ Upstream commit 61f162aa4381845acbdc7f2be4dfb694d027c018 ] Currently a use-after-free may occur if a TMF sas_task is aborted before we handle the IO completion in mpi_ssp_completion(). The abort occurs due to timeout. When the timeout occurs, the SAS_TASK_STATE_ABORTED flag is set and the sas_task is freed in pm8001_exec_internal_tmf_task(). However, if the I/O completion occurs later, the I/O completion still thinks that the sas_task is available. Fix this by clearing the ccb->task if the TMF times out - the I/O completion handler does nothing if this pointer is cleared. Link: https://lore.kernel.org/r/1643289172-165636-3-git-send-email-john.garry@huawei.com Reviewed-by: Damien Le Moal Acked-by: Jack Wang Signed-off-by: John Garry Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/pm8001/pm8001_sas.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/scsi/pm8001/pm8001_sas.c b/drivers/scsi/pm8001/pm8001_sas.c index 83e73009db5cd..c0b45b8a513d7 100644 --- a/drivers/scsi/pm8001/pm8001_sas.c +++ b/drivers/scsi/pm8001/pm8001_sas.c @@ -753,8 +753,13 @@ static int pm8001_exec_internal_tmf_task(struct domain_device *dev, res = -TMF_RESP_FUNC_FAILED; /* Even TMF timed out, return direct. */ if (task->task_state_flags & SAS_TASK_STATE_ABORTED) { + struct pm8001_ccb_info *ccb = task->lldd_task; + pm8001_dbg(pm8001_ha, FAIL, "TMF task[%x]timeout.\n", tmf->tmf); + + if (ccb) + ccb->task = NULL; goto ex_err; } -- 2.34.1