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=-6.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 9647CC10F11 for ; Wed, 24 Apr 2019 17:29:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5D5DD21903 for ; Wed, 24 Apr 2019 17:29:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1556126987; bh=cLZ7lztzulA87sf+3wEBoKC8pACp6BZjerJWJI7YXaI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=p2lHuwyKHprAbvIFMst011+6PKjVX0YDMGJ4P1nRj53SwIE/rEZPBW0QA/FxPvAe/ q7bmuD5/KkCAc4CULvuzNCHocq+vAYVmK/bTK5vTKzC7Y9p6UlKNa7QxWeq6Xye8vh j9KBnrXi45pKxcGb+5Oqrla37cQjS9j4bHYl1ZBM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390858AbfDXR3q (ORCPT ); Wed, 24 Apr 2019 13:29:46 -0400 Received: from mail.kernel.org ([198.145.29.99]:55958 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390178AbfDXR3j (ORCPT ); Wed, 24 Apr 2019 13:29:39 -0400 Received: from localhost (62-193-50-229.as16211.net [62.193.50.229]) (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 1AB9921904; Wed, 24 Apr 2019 17:29:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1556126978; bh=cLZ7lztzulA87sf+3wEBoKC8pACp6BZjerJWJI7YXaI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BBDk+w7V9EK+r8I9mAerFwcqpwQkDI+kAcgm3LVslYECOCm9U+9fy9JTG0efYX5X4 SrV9YB4w/R5ngu4EiAcBuQfl3Jg4iYqo1HMQHc/uN/VdkkacPk1ET1aebPcEx3st5m ni+OqDrlOjS04VJrki1sro4ENl87i/ojjE0bS4pA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Eric Dumazet , Saeed Mahameed Subject: [PATCH 4.19 16/96] net/mlx5: FPGA, tls, hold rcu read lock a bit longer Date: Wed, 24 Apr 2019 19:09:21 +0200 Message-Id: <20190424170920.856647439@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190424170919.829037226@linuxfoundation.org> References: <20190424170919.829037226@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Saeed Mahameed [ Upstream commit 31634bf5dcc418b5b2cacd954394c0c4620db6a2 ] To avoid use-after-free, hold the rcu read lock until we are done copying flow data into the command buffer. Fixes: ab412e1dd7db ("net/mlx5: Accel, add TLS rx offload routines") Reported-by: Eric Dumazet Signed-off-by: Saeed Mahameed Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/mellanox/mlx5/core/fpga/tls.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) --- a/drivers/net/ethernet/mellanox/mlx5/core/fpga/tls.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/fpga/tls.c @@ -217,22 +217,22 @@ int mlx5_fpga_tls_resync_rx(struct mlx5_ void *cmd; int ret; - rcu_read_lock(); - flow = idr_find(&mdev->fpga->tls->rx_idr, ntohl(handle)); - rcu_read_unlock(); - - if (!flow) { - WARN_ONCE(1, "Received NULL pointer for handle\n"); - return -EINVAL; - } - buf = kzalloc(size, GFP_ATOMIC); if (!buf) return -ENOMEM; cmd = (buf + 1); + rcu_read_lock(); + flow = idr_find(&mdev->fpga->tls->rx_idr, ntohl(handle)); + if (unlikely(!flow)) { + rcu_read_unlock(); + WARN_ONCE(1, "Received NULL pointer for handle\n"); + kfree(buf); + return -EINVAL; + } mlx5_fpga_tls_flow_to_cmd(flow, cmd); + rcu_read_unlock(); MLX5_SET(tls_cmd, cmd, swid, ntohl(handle)); MLX5_SET64(tls_cmd, cmd, tls_rcd_sn, be64_to_cpu(rcd_sn));