From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Cc: davem@davemloft.net, netdev@vger.kernel.org
Subject: [PATCH 03/14] netfilter: ipv6: fix use-after-free Write in nf_nat_ipv6_manip_pkt
Date: Fri, 2 Mar 2018 21:32:51 +0100 [thread overview]
Message-ID: <20180302203302.3724-4-pablo@netfilter.org> (raw)
In-Reply-To: <20180302203302.3724-1-pablo@netfilter.org>
From: Florian Westphal <fw@strlen.de>
l4proto->manip_pkt() can cause reallocation of skb head so pointer
to the ipv6 header must be reloaded.
Reported-and-tested-by: <syzbot+10005f4292fc9cc89de7@syzkaller.appspotmail.com>
Fixes: 58a317f1061c89 ("netfilter: ipv6: add IPv6 NAT support")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
net/ipv6/netfilter/nf_nat_l3proto_ipv6.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c b/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c
index bed57ee65f7b..6b7f075f811f 100644
--- 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 sk_buff *skb,
!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;
--
2.11.0
next prev parent reply other threads:[~2018-03-02 20:33 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-02 20:32 [PATCH 00/14] Netfilter/IPVS fixes for net Pablo Neira Ayuso
2018-03-02 20:32 ` [PATCH 01/14] netfilter: ipt_CLUSTERIP: put config struct if we can't increment ct refcount Pablo Neira Ayuso
2018-03-02 20:32 ` [PATCH 02/14] netfilter: ipt_CLUSTERIP: put config instead of freeing it Pablo Neira Ayuso
2018-03-02 20:32 ` Pablo Neira Ayuso [this message]
2018-03-02 20:32 ` [PATCH 04/14] netfilter: bridge: ebt_among: add missing match size checks Pablo Neira Ayuso
2018-03-02 20:32 ` [PATCH 05/14] netfilter: ebtables: convert BUG_ONs to WARN_ONs Pablo Neira Ayuso
2018-03-02 20:32 ` [PATCH 06/14] netfilter: ebtables: CONFIG_COMPAT: don't trust userland offsets Pablo Neira Ayuso
2018-03-02 20:32 ` [PATCH 07/14] netfilter: nf_flow_table: fix checksum when handling DNAT Pablo Neira Ayuso
2018-03-02 20:32 ` [PATCH 08/14] netfilter: increase IPSTATS_MIB_CSUMERRORS stat Pablo Neira Ayuso
2018-03-02 20:32 ` [PATCH 09/14] netfilter: don't set F_IFACE on ipv6 fib lookups Pablo Neira Ayuso
2018-03-02 20:32 ` [PATCH 10/14] netfilter: use skb_to_full_sk in ip6_route_me_harder Pablo Neira Ayuso
2018-03-02 20:32 ` [PATCH 11/14] netfilter: nf_tables: return EBUSY if device already belongs to flowtable Pablo Neira Ayuso
2018-03-02 20:33 ` [PATCH 12/14] netfilter: nf_tables: missing attribute validation in nf_tables_delflowtable() Pablo Neira Ayuso
2018-03-02 20:33 ` [PATCH 13/14] netfilter: nf_tables: use the right index from flowtable error path Pablo Neira Ayuso
2018-03-02 20:33 ` [PATCH 14/14] ipvs: remove IPS_NAT_MASK check to fix passive FTP Pablo Neira Ayuso
2018-03-03 1:32 ` [PATCH 00/14] Netfilter/IPVS fixes for net David Miller
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