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=-10.1 required=3.0 tests=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=ham 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 09B05C2D0EE for ; Thu, 26 Mar 2020 23:24:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BDD802077D for ; Thu, 26 Mar 2020 23:24:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585265043; bh=LIjwsWyqlUInC8u3+aJqbbUPHNjkh/lu20+hMwM4/+k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=zOY5sqNnWmb9w9h6v20C/7oy0T59YJAr6GuNkgycH0DwYqFmARfcljdWJhNDPnmOc Avhk8n5pvzVDtAn/Am7g0wTZCPSkJwgpi+vcqlFtUnz3eAjJuig+916iT7K7M2Ah1r H+qkrB26MazpC0bMycfAz7RZY56b3fV+5vQ6SQFg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727620AbgCZXYC (ORCPT ); Thu, 26 Mar 2020 19:24:02 -0400 Received: from mail.kernel.org ([198.145.29.99]:43114 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727560AbgCZXYC (ORCPT ); Thu, 26 Mar 2020 19:24:02 -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 B593F2073E; Thu, 26 Mar 2020 23:24:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585265041; bh=LIjwsWyqlUInC8u3+aJqbbUPHNjkh/lu20+hMwM4/+k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=l2Z6CQYhRtWDviNoomYNLTg9I/8wjHSILPqfeIGZJVd0/7AuCPBNrO/o3N3aa13Yu r8M4X7AlMucgw2hMzWGRazUtXSBjXEkNcCqFUzeSiMatlpBMlf1ZCEXJ6FTwQAfgWm 9EYqgd5q5DWP3jw7m12LaGIbtQv4+RgO73MSqyGo= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Prabhath Sajeepa , Roland Dreier , Max Gurtovoy , Christoph Hellwig , Keith Busch , Sasha Levin , linux-nvme@lists.infradead.org Subject: [PATCH AUTOSEL 5.5 03/28] nvme-rdma: Avoid double freeing of async event data Date: Thu, 26 Mar 2020 19:23:32 -0400 Message-Id: <20200326232357.7516-3-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200326232357.7516-1-sashal@kernel.org> References: <20200326232357.7516-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Prabhath Sajeepa [ Upstream commit 9134ae2a2546cb96abddcd4469a79c77ee3a4480 ] The timeout of identify cmd, which is invoked as part of admin queue creation, can result in freeing of async event data both in nvme_rdma_timeout handler and error handling path of nvme_rdma_configure_admin queue thus causing NULL pointer reference. Call Trace: ? nvme_rdma_setup_ctrl+0x223/0x800 [nvme_rdma] nvme_rdma_create_ctrl+0x2ba/0x3f7 [nvme_rdma] nvmf_dev_write+0xa54/0xcc6 [nvme_fabrics] __vfs_write+0x1b/0x40 vfs_write+0xb2/0x1b0 ksys_write+0x61/0xd0 __x64_sys_write+0x1a/0x20 do_syscall_64+0x60/0x1e0 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reviewed-by: Roland Dreier Reviewed-by: Max Gurtovoy Reviewed-by: Christoph Hellwig Signed-off-by: Prabhath Sajeepa Signed-off-by: Keith Busch Signed-off-by: Sasha Levin --- drivers/nvme/host/rdma.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c index 3e85c5cacefd2..0fe08c4dfd2f1 100644 --- a/drivers/nvme/host/rdma.c +++ b/drivers/nvme/host/rdma.c @@ -850,9 +850,11 @@ static int nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl *ctrl, if (new) blk_mq_free_tag_set(ctrl->ctrl.admin_tagset); out_free_async_qe: - nvme_rdma_free_qe(ctrl->device->dev, &ctrl->async_event_sqe, - sizeof(struct nvme_command), DMA_TO_DEVICE); - ctrl->async_event_sqe.data = NULL; + if (ctrl->async_event_sqe.data) { + nvme_rdma_free_qe(ctrl->device->dev, &ctrl->async_event_sqe, + sizeof(struct nvme_command), DMA_TO_DEVICE); + ctrl->async_event_sqe.data = NULL; + } out_free_queue: nvme_rdma_free_queue(&ctrl->queues[0]); return error; -- 2.20.1