From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Cc: davem@davemloft.net, stable@vger.kernel.org
Subject: [PATCH -stable-3.9 10/15] netfilter: xt_TCPOPTSTRIP: don't use tcp_hdr()
Date: Tue, 2 Jul 2013 16:51:00 +0200 [thread overview]
Message-ID: <1372776665-6795-10-git-send-email-pablo@netfilter.org> (raw)
In-Reply-To: <1372776665-6795-1-git-send-email-pablo@netfilter.org>
In (bc6bcb5 netfilter: xt_TCPOPTSTRIP: fix possible mangling beyond
packet boundary), the use of tcp_hdr was introduced. However, we
cannot assume that skb->transport_header is set for non-local packets.
Cc: Florian Westphal <fw@strlen.de>
Reported-by: Phil Oester <kernel@linuxace.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
Cherry-pick: ed82c437320c48a4032492f4a55a7e2c934158b6
net/netfilter/xt_TCPOPTSTRIP.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/net/netfilter/xt_TCPOPTSTRIP.c b/net/netfilter/xt_TCPOPTSTRIP.c
index 1eb1a44..b68fa19 100644
--- a/net/netfilter/xt_TCPOPTSTRIP.c
+++ b/net/netfilter/xt_TCPOPTSTRIP.c
@@ -48,11 +48,13 @@ tcpoptstrip_mangle_packet(struct sk_buff *skb,
return NF_DROP;
len = skb->len - tcphoff;
- if (len < (int)sizeof(struct tcphdr) ||
- tcp_hdr(skb)->doff * 4 > len)
+ if (len < (int)sizeof(struct tcphdr))
return NF_DROP;
tcph = (struct tcphdr *)(skb_network_header(skb) + tcphoff);
+ if (tcph->doff * 4 > len)
+ return NF_DROP;
+
opt = (u_int8_t *)tcph;
/*
--
1.7.10.4
next prev parent reply other threads:[~2013-07-02 14:52 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-02 14:50 [PATCH -stable-3.9 01/15] netfilter: xt_TCPOPTSTRIP: fix possible mangling beyond packet boundary Pablo Neira Ayuso
2013-07-02 14:50 ` [PATCH -stable-3.9 02/15] netfilter: ipt_ULOG: fix non-null terminated string in the nf_log path Pablo Neira Ayuso
2013-07-02 14:50 ` [PATCH -stable-3.9 03/15] netfilter: add nf_ipv6_ops hook to fix xt_addrtype with IPv6 Pablo Neira Ayuso
2013-07-02 14:50 ` [PATCH -stable-3.9 04/15] ipvs: Fix reuse connection if real server is dead Pablo Neira Ayuso
2013-07-02 14:50 ` [PATCH -stable-3.9 05/15] netfilter: xt_LOG: fix mark logging for IPv6 packets Pablo Neira Ayuso
2013-07-02 14:50 ` [PATCH -stable-3.9 06/15] ipvs: info leak in __ip_vs_get_dest_entries() Pablo Neira Ayuso
2013-07-02 14:50 ` [PATCH -stable-3.9 07/15] netfilter: nfnetlink_cttimeout: fix incomplete dumping of objects Pablo Neira Ayuso
2013-07-02 14:50 ` [PATCH -stable-3.9 08/15] netfilter: nfnetlink_acct: " Pablo Neira Ayuso
2013-07-02 14:50 ` [PATCH -stable-3.9 09/15] netfilter: xt_TCPMSS: Fix violation of RFC879 in absence of MSS option Pablo Neira Ayuso
2013-07-02 14:51 ` Pablo Neira Ayuso [this message]
2013-07-02 14:51 ` [PATCH -stable-3.9 11/15] netfilter: xt_TCPMSS: Fix missing fragmentation handling Pablo Neira Ayuso
2013-07-02 14:51 ` [PATCH -stable-3.9 12/15] netfilter: xt_TCPMSS: Fix IPv6 default MSS too Pablo Neira Ayuso
2013-07-02 14:51 ` [PATCH -stable-3.9 13/15] ipvs: SCTP ports should be writable in ICMP packets Pablo Neira Ayuso
2013-07-02 14:51 ` [PATCH -stable-3.9 14/15] netfilter: nf_nat_sip: fix mangling Pablo Neira Ayuso
2013-07-02 14:51 ` [PATCH -stable-3.9 15/15] netfilter: ctnetlink: send event when conntrack label was modified Pablo Neira Ayuso
2013-07-04 14:59 ` [PATCH -stable-3.9 01/15] netfilter: xt_TCPOPTSTRIP: fix possible mangling beyond packet boundary Luis Henriques
2013-07-05 5:01 ` Pablo Neira Ayuso
2013-07-05 8:36 ` Luis Henriques
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