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=-9.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 CF91AC2BB1D for ; Tue, 7 Apr 2020 10:28:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A570E2145D for ; Tue, 7 Apr 2020 10:28:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586255320; bh=Fs02QOeqFeunLDhAhOWC8FGhC42gEBQwFYKZQ5UAcC8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=NyS2yV5xccE1i4k+RPUYlbg59ZknE/1W5PfUDHn3zrzBcOUNK0QTHaKGW7S+//Bjs eNk2myUpOP6NBUO2yTQV9pmzDrLtcg+QzW0JU8UUeIq+JI891M7DG35HEDnbF9E5uy X+kFbPLD7t80W0fSf2le0cPynOa9ZOdPxtzAJRIU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728884AbgDGKZJ (ORCPT ); Tue, 7 Apr 2020 06:25:09 -0400 Received: from mail.kernel.org ([198.145.29.99]:35528 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728843AbgDGKZF (ORCPT ); Tue, 7 Apr 2020 06:25:05 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 85C4820644; Tue, 7 Apr 2020 10:25:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586255105; bh=Fs02QOeqFeunLDhAhOWC8FGhC42gEBQwFYKZQ5UAcC8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ah5OOGzKCvaOOTCZmFdvapXOu8pnIaRaSR2cv8yPfuvLJETfcFMfJZkO2Z7wHYxQD aG+PieNbP+bPwszG3AXemGhIy7GTpWnFp6CwvtFVCbIjF9wVf3qZKjAE+PhMVv3O+x 5lrbyNL9AHjsMiIIkgHinzCDg8vQb7TDuumH03rc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Roland Dreier , Max Gurtovoy , Christoph Hellwig , Prabhath Sajeepa , Keith Busch , Sasha Levin Subject: [PATCH 5.5 07/46] nvme-rdma: Avoid double freeing of async event data Date: Tue, 7 Apr 2020 12:21:38 +0200 Message-Id: <20200407101500.273308750@linuxfoundation.org> X-Mailer: git-send-email 2.26.0 In-Reply-To: <20200407101459.502593074@linuxfoundation.org> References: <20200407101459.502593074@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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 @@ out_free_tagset: 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