linux-kernel - [PATCH 3.12 71/77] netfilter: fix wrong byte order in nf_ct_seqadj

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Date:	Mon, 13 Jan 2014 16:28:32 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Dawid Stawiarski <dawid.stawiarski@...art.pl>,
	Phil Oester <kernel@...uxace.com>,
	Pablo Neira Ayuso <pablo@...filter.org>
Subject: [PATCH 3.12 71/77] netfilter: fix wrong byte order in nf_ct_seqadj_set internal information

3.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Phil Oester <kernel@...uxace.com>

commit 23dfe136e2bf8d9ea1095704c535368a9bc721da upstream.

In commit 41d73ec053d2, sequence number adjustments were moved to a
separate file. Unfortunately, the sequence numbers that are stored
in the nf_ct_seqadj structure are expressed in host byte order. The
necessary ntohl call was removed when the call to adjust_tcp_sequence
was collapsed into nf_ct_seqadj_set. This broke the FTP NAT helper.
Fix it by adding back the byte order conversions.

Reported-by: Dawid Stawiarski <dawid.stawiarski@...art.pl>
Signed-off-by: Phil Oester <kernel@...uxace.com>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/netfilter/nf_conntrack_seqadj.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/net/netfilter/nf_conntrack_seqadj.c
+++ b/net/netfilter/nf_conntrack_seqadj.c
@@ -41,8 +41,8 @@ int nf_ct_seqadj_set(struct nf_conn *ct,
 	spin_lock_bh(&ct->lock);
 	this_way = &seqadj->seq[dir];
 	if (this_way->offset_before == this_way->offset_after ||
-	    before(this_way->correction_pos, seq)) {
-		this_way->correction_pos = seq;
+	    before(this_way->correction_pos, ntohl(seq))) {
+		this_way->correction_pos = ntohl(seq);
 		this_way->offset_before	 = this_way->offset_after;
 		this_way->offset_after	+= off;
 	}


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