From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pablo Neira Ayuso Subject: [PATCH 3/3] netfilter: xt_TCPMSS: Fix missing fragmentation handling Date: Mon, 17 Jun 2013 21:34:39 +0200 Message-ID: <1371497679-14314-4-git-send-email-pablo@netfilter.org> References: <1371497679-14314-1-git-send-email-pablo@netfilter.org> Cc: davem@davemloft.net, netdev@vger.kernel.org To: netfilter-devel@vger.kernel.org Return-path: Received: from mail.us.es ([193.147.175.20]:51631 "EHLO mail.us.es" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753015Ab3FQTey (ORCPT ); Mon, 17 Jun 2013 15:34:54 -0400 In-Reply-To: <1371497679-14314-1-git-send-email-pablo@netfilter.org> Sender: netfilter-devel-owner@vger.kernel.org List-ID: From: Phil Oester Similar to commit bc6bcb59 ("netfilter: xt_TCPOPTSTRIP: fix possible mangling beyond packet boundary"), add safe fragment handling to xt_TCPMSS. Signed-off-by: Phil Oester Signed-off-by: Pablo Neira Ayuso --- net/netfilter/xt_TCPMSS.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/netfilter/xt_TCPMSS.c b/net/netfilter/xt_TCPMSS.c index 6640a22..7011c71 100644 --- a/net/netfilter/xt_TCPMSS.c +++ b/net/netfilter/xt_TCPMSS.c @@ -57,6 +57,10 @@ tcpmss_mangle_packet(struct sk_buff *skb, u16 newmss; u8 *opt; + /* This is a fragment, no TCP header is available */ + if (par->fragoff != 0) + return XT_CONTINUE; + if (!skb_make_writable(skb, skb->len)) return -1; -- 1.7.10.4