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=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,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 9C4AEC433E0 for ; Mon, 1 Mar 2021 23:46:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 683B760200 for ; Mon, 1 Mar 2021 23:46:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238915AbhCAXfu (ORCPT ); Mon, 1 Mar 2021 18:35:50 -0500 Received: from mail.kernel.org ([198.145.29.99]:57174 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231744AbhCASGo (ORCPT ); Mon, 1 Mar 2021 13:06:44 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 76F416509F; Mon, 1 Mar 2021 17:34:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1614620043; bh=VASjeEJi0qWw/zRtese4yceTqBsdK7bRG7QiZA5eEA0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UgbMFUT3GVOOHz7//MIykUtpU/oBq8ee7jLUhxHbgAyv8DoMXGm6/HnFBy04lBPL1 FjsYWcHpViU4S2cjxdMQEJWsUD9yNgJiX4Z97T5AhGg/Zt0a4b6mv5uNlXp2EfeyKJ jiGLUEzteUoJRQGJWdQfP0ImFJbBeCtZnYgKdd4Q= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Stefano Garzarella , "Michael S. Tsirkin" , Jason Wang , Eli Cohen Subject: [PATCH 5.11 002/775] vdpa/mlx5: fix param validation in mlx5_vdpa_get_config() Date: Mon, 1 Mar 2021 17:02:50 +0100 Message-Id: <20210301161201.815806758@linuxfoundation.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210301161201.679371205@linuxfoundation.org> References: <20210301161201.679371205@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: Stefano Garzarella commit dcfde1635e764fd69cc756c7780d144e288608e9 upstream. It's legal to have 'offset + len' equal to sizeof(struct virtio_net_config), since 'ndev->config' is a 'struct virtio_net_config', so we can safely copy its content under this condition. Fixes: 1a86b377aa21 ("vdpa/mlx5: Add VDPA driver for supported mlx5 devices") Cc: stable@vger.kernel.org Signed-off-by: Stefano Garzarella Link: https://lore.kernel.org/r/20210208161741.104939-1-sgarzare@redhat.com Signed-off-by: Michael S. Tsirkin Acked-by: Jason Wang Acked-by: Eli Cohen Signed-off-by: Greg Kroah-Hartman --- drivers/vdpa/mlx5/net/mlx5_vnet.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c @@ -1820,7 +1820,7 @@ static void mlx5_vdpa_get_config(struct struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev); struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev); - if (offset + len < sizeof(struct virtio_net_config)) + if (offset + len <= sizeof(struct virtio_net_config)) memcpy(buf, (u8 *)&ndev->config + offset, len); }