From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:46922 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932789AbeCMLPf (ORCPT ); Tue, 13 Mar 2018 07:15:35 -0400 Subject: Patch "netfilter: ipv6: fix use-after-free Write in nf_nat_ipv6_manip_pkt" has been added to the 4.15-stable tree To: fw@strlen.de, gregkh@linuxfoundation.org, pablo@netfilter.org, syzbot+10005f4292fc9cc89de7@syzkaller.appspotmail.com Cc: , From: Date: Tue, 13 Mar 2018 12:15:22 +0100 Message-ID: <152093972212053@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled netfilter: ipv6: fix use-after-free Write in nf_nat_ipv6_manip_pkt to the 4.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: netfilter-ipv6-fix-use-after-free-write-in-nf_nat_ipv6_manip_pkt.patch and it can be found in the queue-4.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From b078556aecd791b0e5cb3a59f4c3a14273b52121 Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Mon, 19 Feb 2018 08:10:17 +0100 Subject: netfilter: ipv6: fix use-after-free Write in nf_nat_ipv6_manip_pkt From: Florian Westphal commit b078556aecd791b0e5cb3a59f4c3a14273b52121 upstream. l4proto->manip_pkt() can cause reallocation of skb head so pointer to the ipv6 header must be reloaded. Reported-and-tested-by: Fixes: 58a317f1061c89 ("netfilter: ipv6: add IPv6 NAT support") Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso Signed-off-by: Greg Kroah-Hartman --- net/ipv6/netfilter/nf_nat_l3proto_ipv6.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c +++ b/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c @@ -99,6 +99,10 @@ static bool nf_nat_ipv6_manip_pkt(struct !l4proto->manip_pkt(skb, &nf_nat_l3proto_ipv6, iphdroff, hdroff, target, maniptype)) return false; + + /* must reload, offset might have changed */ + ipv6h = (void *)skb->data + iphdroff; + manip_addr: if (maniptype == NF_NAT_MANIP_SRC) ipv6h->saddr = target->src.u3.in6; Patches currently in stable-queue which might be from fw@strlen.de are queue-4.15/netfilter-add-back-stackpointer-size-checks.patch queue-4.15/netfilter-ipv6-fix-use-after-free-write-in-nf_nat_ipv6_manip_pkt.patch queue-4.15/netfilter-ebtables-config_compat-don-t-trust-userland-offsets.patch queue-4.15/netfilter-bridge-ebt_among-add-missing-match-size-checks.patch