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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 97068C43462 for ; Mon, 19 Apr 2021 20:50:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 77E6C6101C for ; Mon, 19 Apr 2021 20:50:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243281AbhDSUud (ORCPT ); Mon, 19 Apr 2021 16:50:33 -0400 Received: from mail.kernel.org ([198.145.29.99]:54296 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242752AbhDSUsS (ORCPT ); Mon, 19 Apr 2021 16:48:18 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id F2B95613BF; Mon, 19 Apr 2021 20:45:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1618865143; bh=lAr+LL3W7r8HRAc6tGy0txtJ3YSbBnQglZIChxaXQb0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XuzmRaUpsmUuLG7K7fALD7junQfsSDKQPbi3o1yE/GVyPz6GdktdqRr4kBitt1ZQJ 1hhpRZ7ovHQgpx3Q2Jjx8xCBNOcjPoVwKX6o+6k5yo7PlD+6mzo53GgnrLC2+v2/q5 tuo/m5FhVr2KyGK50jI+ss09KGSPlghT2rXhQNty2sbeVlCNaq2D719kJkMIZD4H+b xVkpKDB3/fCfn2YWLrK7sTcsCEHGxrmwkYWBBjvBTp1ozEzaR58EJLn8OTRlHy1Ek9 1ZffKQCZGwNq31OEynpED46nWVqs/jz3WuCxwzTkzjFvmUl9FIy9G9IbuTKcpJlsDm utArttqKgKU6Q== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Phillip Potter , Eric Dumazet , syzbot+2e406a9ac75bb71d4b7a@syzkaller.appspotmail.com, "David S . Miller" , Sasha Levin , netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.14 04/11] net: geneve: check skb is large enough for IPv4/IPv6 header Date: Mon, 19 Apr 2021 16:45:29 -0400 Message-Id: <20210419204536.6924-4-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210419204536.6924-1-sashal@kernel.org> References: <20210419204536.6924-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Phillip Potter [ Upstream commit 6628ddfec7580882f11fdc5c194a8ea781fdadfa ] Check within geneve_xmit_skb/geneve6_xmit_skb that sk_buff structure is large enough to include IPv4 or IPv6 header, and reject if not. The geneve_xmit_skb portion and overall idea was contributed by Eric Dumazet. Fixes a KMSAN-found uninit-value bug reported by syzbot at: https://syzkaller.appspot.com/bug?id=abe95dc3e3e9667fc23b8d81f29ecad95c6f106f Suggested-by: Eric Dumazet Reported-by: syzbot+2e406a9ac75bb71d4b7a@syzkaller.appspotmail.com Signed-off-by: Phillip Potter Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/geneve.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c index f48006c22a8a..2a9bb13ecb54 100644 --- a/drivers/net/geneve.c +++ b/drivers/net/geneve.c @@ -835,6 +835,9 @@ static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev, __be16 df; int err; + if (!pskb_network_may_pull(skb, sizeof(struct iphdr))) + return -EINVAL; + sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info, geneve->info.key.tp_dst, sport); @@ -882,6 +885,9 @@ static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev, __be16 sport; int err; + if (!pskb_network_may_pull(skb, sizeof(struct ipv6hdr))) + return -EINVAL; + sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info, geneve->info.key.tp_dst, sport); -- 2.30.2