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=-19.4 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, 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 06D92C07E99 for ; Mon, 12 Jul 2021 08:42:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D8A1060FEF for ; Mon, 12 Jul 2021 08:42:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346384AbhGLIpL (ORCPT ); Mon, 12 Jul 2021 04:45:11 -0400 Received: from mail.kernel.org ([198.145.29.99]:35484 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1350802AbhGLHvT (ORCPT ); Mon, 12 Jul 2021 03:51:19 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 89BE361158; Mon, 12 Jul 2021 07:48:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626076107; bh=1GtE4ZKpkeus+16F+eP9GUcpUAgKB2vZGTTwj9UUmR0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ey5DnqNuYRcdMHhcTdi6E95trQ/DXrijh1FwbxVi6MDj/i0WhBQ1LX8/OyhI3nQGY 0/tZpAFu8VzVD7rbH4fSB/2BbJf51NRlyUkysyx/ZiJuVll2uRqNjpJaXfRiVUgwou aNLkPUtbsQFLl83RVC2yB6N19bd5PGKi4JCklO00= 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 5.13 474/800] netfilter: nft_exthdr: check for IPv6 packet before further processing Date: Mon, 12 Jul 2021 08:08:17 +0200 Message-Id: <20210712061017.623471352@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210712060912.995381202@linuxfoundation.org> References: <20210712060912.995381202@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 f64f0017e9a5..670dd146fb2b 100644 --- a/net/netfilter/nft_exthdr.c +++ b/net/netfilter/nft_exthdr.c @@ -42,6 +42,9 @@ 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) { nft_reg_store8(dest, err >= 0); -- 2.30.2