netdev - [patch 3/3 -mainline] liquidio: off by one in liquidio_set_mcast

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Message-ID: <20160618085038.GF21713@mwanda>
Date:	Sat, 18 Jun 2016 11:50:39 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Derek Chickles <derek.chickles@...iumnetworks.com>
Cc:	Satanand Burla <satananda.burla@...iumnetworks.com>,
	Felix Manlunas <felix.manlunas@...iumnetworks.com>,
	Raghu Vatsavayi <raghu.vatsavayi@...iumnetworks.com>,
	netdev@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [patch 3/3 -mainline] liquidio: off by one in
 liquidio_set_mcast_list()

The nctrl.udd[] array has 32 elements of size u64.

Imagine that netdev_mc_count() returns more than 32.  That means
"mc_count" is 32.  On the last iteration through the loop we have
mc == &nctrl.udd[32] so we're writing one element beyond the end
of the array.

Fixes: f21fb3ed364b ('Add support of Cavium Liquidio ethernet adapters')
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/drivers/net/ethernet/cavium/liquidio/lio_main.c b/drivers/net/ethernet/cavium/liquidio/lio_main.c
index 1126422..41ee8bd 100644
--- a/drivers/net/ethernet/cavium/liquidio/lio_main.c
+++ b/drivers/net/ethernet/cavium/liquidio/lio_main.c
@@ -2376,7 +2376,7 @@ static void liquidio_set_mcast_list(struct net_device *netdev)
 		memcpy(((u8 *)mc) + 2, ha->addr, ETH_ALEN);
 		/* no need to swap bytes */
 
-		if (++mc > &nctrl.udd[mc_count])
+		if (++mc >= &nctrl.udd[mc_count])
 			break;
 	}