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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 AD16AFA372C for ; Fri, 8 Nov 2019 18:52:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 79677214DB for ; Fri, 8 Nov 2019 18:52:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573239160; bh=Nltidl9nOoh1f2F+7murHOmp8tnBH76sMED4nsQk5mY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=GL5ZNrupHD3l5lxuRkBUQ8v5e20AqTmD51LxxDGioZgebuo5Zx6OQ2G1IOg66VfkP Ek2OvlkJqhBrFdxLiTof3DdyqZ3XrtZgbcnEMizHQd0L6K3EM0fivUC6UNOo1t1gVH t2/qvKvJppvJ4IzFeED18L2/SWAF+AKky1z3d/Y8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731541AbfKHSwj (ORCPT ); Fri, 8 Nov 2019 13:52:39 -0500 Received: from mail.kernel.org ([198.145.29.99]:48944 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731483AbfKHSwg (ORCPT ); Fri, 8 Nov 2019 13:52:36 -0500 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 B258321D7E; Fri, 8 Nov 2019 18:52:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573239156; bh=Nltidl9nOoh1f2F+7murHOmp8tnBH76sMED4nsQk5mY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=1BFX3hSQ905Zo/lHe3JnUut2FMR19pWD3fHasQLrvIjfF7ixBTeB8Lg7hGA4PkhAP gRoD4BldfZIFfeHs2ngtT62UCKFEQvFdFfPHAd3yhGfjLTSEieI0p+UE4jiy62MCfX rzruDTgmqz8rBT3+D7iCUJrrhF3oYc7hG8ikUy2E= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Xin Long , "David S. Miller" Subject: [PATCH 4.4 19/75] vxlan: check tun_info options_len properly Date: Fri, 8 Nov 2019 19:49:36 +0100 Message-Id: <20191108174726.087323143@linuxfoundation.org> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20191108174708.135680837@linuxfoundation.org> References: <20191108174708.135680837@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: Xin Long [ Upstream commit eadf52cf1852196a1363044dcda22fa5d7f296f7 ] This patch is to improve the tun_info options_len by dropping the skb when TUNNEL_VXLAN_OPT is set but options_len is less than vxlan_metadata. This can void a potential out-of-bounds access on ip_tun_info. Fixes: ee122c79d422 ("vxlan: Flow based tunneling") Signed-off-by: Xin Long Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/vxlan.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- a/drivers/net/vxlan.c +++ b/drivers/net/vxlan.c @@ -2006,8 +2006,11 @@ static void vxlan_xmit_one(struct sk_buf ttl = info->key.ttl; tos = info->key.tos; - if (info->options_len) + if (info->options_len) { + if (info->options_len < sizeof(*md)) + goto drop; md = ip_tunnel_info_opts(info); + } } else { md->gbp = skb->mark; }