linux-kernel - [PATCH 3.2 65/79] netfilter: xt_TCPMSS: correct return value in tcpmss_mangle

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Message-ID: <lsq.1518322806.468971680@decadent.org.uk>
Date:   Sun, 11 Feb 2018 04:20:06 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Pablo Neira Ayuso" <pablo@...filter.org>,
        "Phil Oester" <kernel@...uxace.com>
Subject: [PATCH 3.2 65/79] netfilter: xt_TCPMSS: correct return value in
 tcpmss_mangle_packet

3.2.99-rc1 review patch.  If anyone has any objections, please let me know.

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

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

commit 1205e1fa615805c9efa97303b552cf445965752a upstream.

In commit b396966c4 (netfilter: xt_TCPMSS: Fix missing fragmentation handling),
I attempted to add safe fragment handling to xt_TCPMSS.  However, Andy Padavan
of Project N56U correctly points out that returning XT_CONTINUE in this
function does not work.  The callers (tcpmss_tg[46]) expect to receive a value
of 0 in order to return XT_CONTINUE.

Signed-off-by: Phil Oester <kernel@...uxace.com>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/netfilter/xt_TCPMSS.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/netfilter/xt_TCPMSS.c
+++ b/net/netfilter/xt_TCPMSS.c
@@ -59,7 +59,7 @@ tcpmss_mangle_packet(struct sk_buff *skb
 
 	/* This is a fragment, no TCP header is available */
 	if (par->fragoff != 0)
-		return XT_CONTINUE;
+		return 0;
 
 	if (!skb_make_writable(skb, skb->len))
 		return -1;