netdev - [patch] netfilter: prevent harmless integer overflow

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Message-ID: <20130618074603.GF12329@elgon.mountain>
Date:	Tue, 18 Jun 2013 10:46:03 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Bart De Schuymer <bart.de.schuymer@...dora.be>
Cc:	Pablo Neira Ayuso <pablo@...filter.org>,
	Patrick McHardy <kaber@...sh.net>,
	Stephen Hemminger <stephen@...workplumber.org>,
	"David S. Miller" <davem@...emloft.net>,
	netfilter-devel@...r.kernel.org, netfilter@...r.kernel.org,
	coreteam@...filter.org, bridge@...ts.linux-foundation.org,
	netdev@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [patch] netfilter: prevent harmless integer overflow

This overflow is harmless because a few lines later we check:

	if (num_counters != t->private->nentries) {

But it still upsets the static checkers.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index 3d110c4..141350e 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -1278,6 +1278,8 @@ static int do_update_counters(struct net *net, const char *name,
 
 	if (num_counters == 0)
 		return -EINVAL;
+	if (num_counters > INT_MAX / sizeof(*tmp))
+		return -ENOMEM;
 
 	tmp = vmalloc(num_counters * sizeof(*tmp));
 	if (!tmp)
--
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