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,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 12470C10F11 for ; Wed, 24 Apr 2019 17:22:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CA39F205ED for ; Wed, 24 Apr 2019 17:22:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1556126545; bh=KH5b9snLOUk5DzqAfYhhrMg3YJbma3wtUMdegrLnhZc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=07bhxjmMBposyNHJACIzXnj0+oJnyQgG7b+dLHd4MtFnw4sgKdelXUezwAJgZuxGT BLsOM0UIoW4MITjTE52znqN1u3jDbVyaizGkSJ1moD6Sm9mbV+LOtvAE6S3XqaM2Sp juiD0+6oOY0yvFuZBMXSySdEzsAmg9bD1zPQhK+I= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389559AbfDXRWY (ORCPT ); Wed, 24 Apr 2019 13:22:24 -0400 Received: from mail.kernel.org ([198.145.29.99]:47914 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389542AbfDXRWV (ORCPT ); Wed, 24 Apr 2019 13:22:21 -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 5E62020675; Wed, 24 Apr 2019 17:22:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1556126540; bh=KH5b9snLOUk5DzqAfYhhrMg3YJbma3wtUMdegrLnhZc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mVcHBVeVkER06uOxVLmixvmS9SG/zRtyjbKnPeqf4tNb0bRYnOnSwPiYpberfV1Mz 3q/zcY6/wj7WnJB5Ll26Yz7m4cnbE4/QZqIQMk4EWypqeKBV4xvaIDZ53a4gaDC/f4 0bT8jLhZiiQIpyw2zalB/wo4jUQANxTWaB8n503A= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Stephen Suryaputra , "David S. Miller" Subject: [PATCH 4.4 142/168] ipv4: recompile ip options in ipv4_link_failure Date: Wed, 24 Apr 2019 19:09:46 +0200 Message-Id: <20190424170931.635886532@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190424170923.452349382@linuxfoundation.org> References: <20190424170923.452349382@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: Stephen Suryaputra [ Upstream commit ed0de45a1008991fdaa27a0152befcb74d126a8b ] Recompile IP options since IPCB may not be valid anymore when ipv4_link_failure is called from arp_error_report. Refer to the commit 3da1ed7ac398 ("net: avoid use IPCB in cipso_v4_error") and the commit before that (9ef6b42ad6fd) for a similar issue. Signed-off-by: Stephen Suryaputra Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/ipv4/route.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -1165,8 +1165,16 @@ static struct dst_entry *ipv4_dst_check( static void ipv4_link_failure(struct sk_buff *skb) { struct rtable *rt; + struct ip_options opt; - icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); + /* Recompile ip options since IPCB may not be valid anymore. + */ + memset(&opt, 0, sizeof(opt)); + opt.optlen = ip_hdr(skb)->ihl*4 - sizeof(struct iphdr); + if (__ip_options_compile(dev_net(skb->dev), &opt, skb, NULL)) + return; + + __icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0, &opt); rt = skb_rtable(skb); if (rt)