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=-20.2 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 A08F4C6377E for ; Mon, 19 Jul 2021 15:41:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7CEF36120D for ; Mon, 19 Jul 2021 15:41:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345322AbhGSPAc (ORCPT ); Mon, 19 Jul 2021 11:00:32 -0400 Received: from mail.kernel.org ([198.145.29.99]:54952 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S245102AbhGSOjQ (ORCPT ); Mon, 19 Jul 2021 10:39:16 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 6F26F6112D; Mon, 19 Jul 2021 15:18:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626707914; bh=qnYEtcBDceRQ0JPUdv62x6m/W6ksONb5rBwKgOpVu4k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TvgbCpqIiX2zLc1Xa/cwgXleW4+XgUAThJ4uK6G4EMgwL1SBBRGKDwMUsISwo8ipj V9ZhqTtePYnSezCBywICBOmkVjvkJaRIK4oMavPUtbV9Gd9FItw909ja2f63Pnyrs5 l2Ul4sALRY5CluyjjVlxxVYjb1uELiOHhT86rAeY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Pablo Neira Ayuso , Sasha Levin Subject: [PATCH 4.14 105/315] netfilter: nft_exthdr: check for IPv6 packet before further processing Date: Mon, 19 Jul 2021 16:49:54 +0200 Message-Id: <20210719144946.328999381@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210719144942.861561397@linuxfoundation.org> References: <20210719144942.861561397@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: Pablo Neira Ayuso [ Upstream commit cdd73cc545c0fb9b1a1f7b209f4f536e7990cff4 ] ipv6_find_hdr() does not validate that this is an IPv6 packet. Add a sanity check for calling ipv6_find_hdr() to make sure an IPv6 packet is passed for parsing. Fixes: 96518518cc41 ("netfilter: add nftables") Signed-off-by: Pablo Neira Ayuso Signed-off-by: Sasha Levin --- net/netfilter/nft_exthdr.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/netfilter/nft_exthdr.c b/net/netfilter/nft_exthdr.c index a0a93d987a3b..a301d3bbd3fa 100644 --- a/net/netfilter/nft_exthdr.c +++ b/net/netfilter/nft_exthdr.c @@ -46,6 +46,9 @@ static void nft_exthdr_ipv6_eval(const struct nft_expr *expr, unsigned int offset = 0; int err; + if (pkt->skb->protocol != htons(ETH_P_IPV6)) + goto err; + err = ipv6_find_hdr(pkt->skb, &offset, priv->type, NULL, NULL); if (priv->flags & NFT_EXTHDR_F_PRESENT) { *dest = (err >= 0); -- 2.30.2