linux-kernel - [PATCH] [257/275] netfilter: arpt_mangle: fix return values of checkentry

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Message-Id: <20110330210824.45DFF3E1A05@tassilo.jf.intel.com>
Date:	Wed, 30 Mar 2011 14:08:24 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	pablo@...filter.org, stable@...nel.org, kaber@...sh.net,
	ak@...ux.intel.com, linux-kernel@...r.kernel.org,
	stable@...nel.org, tim.bird@...sony.com
Subject: [PATCH] [257/275] netfilter: arpt_mangle: fix return values of checkentry

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
In 135367b "netfilter: xtables: change xt_target.checkentry return type",
the type returned by checkentry was changed from boolean to int, but the
return values where not adjusted.

arptables: Input/output error

This broke arptables with the mangle target since it returns true
under success, which is interpreted by xtables as >0, thus
returning EIO.

The following Linux kernels are affected:
* 2.6.35.9
* 2.6.36.4
* 2.6.37.3

Cc: stable@...nel.org
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Patrick McHardy <kaber@...sh.net>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
(cherry picked from commit 9d0db8b6b1da9e3d4c696ef29449700c58d589db)
---
 net/ipv4/netfilter/arpt_mangle.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Index: linux-2.6.35.y/net/ipv4/netfilter/arpt_mangle.c
===================================================================
--- linux-2.6.35.y.orig/net/ipv4/netfilter/arpt_mangle.c	2011-01-13 09:47:51.000000000 -0800
+++ linux-2.6.35.y/net/ipv4/netfilter/arpt_mangle.c	2011-03-29 23:12:09.451240810 -0700
@@ -60,12 +60,12 @@
 
 	if (mangle->flags & ~ARPT_MANGLE_MASK ||
 	    !(mangle->flags & ARPT_MANGLE_MASK))
-		return false;
+		return -EINVAL;
 
 	if (mangle->target != NF_DROP && mangle->target != NF_ACCEPT &&
 	   mangle->target != ARPT_CONTINUE)
-		return false;
-	return true;
+		return -EINVAL;
+	return 0;
 }
 
 static struct xt_target arpt_mangle_reg __read_mostly = {
--
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