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=-14.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 2D6B4C433E1 for ; Mon, 24 Aug 2020 17:17:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F29892067C for ; Mon, 24 Aug 2020 17:17:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598289462; bh=lFb2Q2xM9c4Y7D6VE/bsVUu/YFedlovtL8eR4vN3fhs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=OzGzrO7kuoRGDJSk9LJM3Dk9WxgtB1IbI6LBnbQgJixIqsE68JRNXCLP6J1FAh7VE Z+S12/4ICx2czQNj00lCOKFGMN0m4U4jic9C5Ip5i+T753Fl1xdtZL45BvTqhZeZRe xX+ufxZKDamYwXGCu93Kt4qbM9X3SwIp5Z4c9pN0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726706AbgHXRRk (ORCPT ); Mon, 24 Aug 2020 13:17:40 -0400 Received: from mail.kernel.org ([198.145.29.99]:41062 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728307AbgHXQgj (ORCPT ); Mon, 24 Aug 2020 12:36:39 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0A3BF22CBB; Mon, 24 Aug 2020 16:36:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598286969; bh=lFb2Q2xM9c4Y7D6VE/bsVUu/YFedlovtL8eR4vN3fhs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=2jktTcpzFd6vezRFcWzBNphXKMUuKtclDx37AeGetC1grg+Uaelxe3LtaIdIZ4uad kCcf1+kYmjQKUldczxKhJSvA4Z+CsINfrudLy+BtmzUj1vBUWFwWj5Bi//qY2jK7Il Its8dVbvQNJZCIdmaY+JiY9bMGwlfvA778vhEOks= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Quinn Tran , Himanshu Madhani , Nilesh Javali , "Martin K . Petersen" , Sasha Levin , linux-scsi@vger.kernel.org Subject: [PATCH AUTOSEL 5.8 48/63] scsi: qla2xxx: Fix null pointer access during disconnect from subsystem Date: Mon, 24 Aug 2020 12:34:48 -0400 Message-Id: <20200824163504.605538-48-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200824163504.605538-1-sashal@kernel.org> References: <20200824163504.605538-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Quinn Tran [ Upstream commit 83949613fac61e8e37eadf8275bf072342302f4e ] NVMEAsync command is being submitted to QLA while the same NVMe controller is in the middle of reset. The reset path has deleted the association and freed aen_op->fcp_req.private. Add a check for this private pointer before issuing the command. ... 6 [ffffb656ca11fce0] page_fault at ffffffff8c00114e [exception RIP: qla_nvme_post_cmd+394] RIP: ffffffffc0d012ba RSP: ffffb656ca11fd98 RFLAGS: 00010206 RAX: ffff8fb039eda228 RBX: ffff8fb039eda200 RCX: 00000000000da161 RDX: ffffffffc0d4d0f0 RSI: ffffffffc0d26c9b RDI: ffff8fb039eda220 RBP: 0000000000000013 R8: ffff8fb47ff6aa80 R9: 0000000000000002 R10: 0000000000000000 R11: ffffb656ca11fdc8 R12: ffff8fb27d04a3b0 R13: ffff8fc46dd98a58 R14: 0000000000000000 R15: ffff8fc4540f0000 ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018 7 [ffffb656ca11fe08] nvme_fc_start_fcp_op at ffffffffc0241568 [nvme_fc] 8 [ffffb656ca11fe50] nvme_fc_submit_async_event at ffffffffc0241901 [nvme_fc] 9 [ffffb656ca11fe68] nvme_async_event_work at ffffffffc014543d [nvme_core] 10 [ffffb656ca11fe98] process_one_work at ffffffff8b6cd437 11 [ffffb656ca11fed8] worker_thread at ffffffff8b6cdcef 12 [ffffb656ca11ff10] kthread at ffffffff8b6d3402 13 [ffffb656ca11ff50] ret_from_fork at ffffffff8c000255 -- PID: 37824 TASK: ffff8fb033063d80 CPU: 20 COMMAND: "kworker/u97:451" 0 [ffffb656ce1abc28] __schedule at ffffffff8be629e3 1 [ffffb656ce1abcc8] schedule at ffffffff8be62fe8 2 [ffffb656ce1abcd0] schedule_timeout at ffffffff8be671ed 3 [ffffb656ce1abd70] wait_for_completion at ffffffff8be639cf 4 [ffffb656ce1abdd0] flush_work at ffffffff8b6ce2d5 5 [ffffb656ce1abe70] nvme_stop_ctrl at ffffffffc0144900 [nvme_core] 6 [ffffb656ce1abe80] nvme_fc_reset_ctrl_work at ffffffffc0243445 [nvme_fc] 7 [ffffb656ce1abe98] process_one_work at ffffffff8b6cd437 8 [ffffb656ce1abed8] worker_thread at ffffffff8b6cdb50 9 [ffffb656ce1abf10] kthread at ffffffff8b6d3402 10 [ffffb656ce1abf50] ret_from_fork at ffffffff8c000255 Link: https://lore.kernel.org/r/20200806111014.28434-10-njavali@marvell.com Reviewed-by: Himanshu Madhani Signed-off-by: Quinn Tran Signed-off-by: Nilesh Javali Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/qla2xxx/qla_nvme.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/scsi/qla2xxx/qla_nvme.c b/drivers/scsi/qla2xxx/qla_nvme.c index fa695a4007f86..262dfd7635a48 100644 --- a/drivers/scsi/qla2xxx/qla_nvme.c +++ b/drivers/scsi/qla2xxx/qla_nvme.c @@ -536,6 +536,11 @@ static int qla_nvme_post_cmd(struct nvme_fc_local_port *lport, struct nvme_private *priv = fd->private; struct qla_nvme_rport *qla_rport = rport->private; + if (!priv) { + /* nvme association has been torn down */ + return rval; + } + fcport = qla_rport->fcport; if (!qpair || !fcport || (qpair && !qpair->fw_started) || -- 2.25.1