linux-kernel - [ 085/167] [PATCH 24/26] ksz884x: dont copy too much in netdev_set_mac

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Message-Id: <20120509055041.563205578@decadent.org.uk>
Date:	Wed, 09 May 2012 06:51:54 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Dan Carpenter <dan.carpenter@...cle.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 085/167] [PATCH 24/26] ksz884x: dont copy too much in
 netdev_set_mac_address()

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

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

From: Dan Carpenter <dan.carpenter@...cle.com>

[ Upstream commit 716af4abd6e6370226f567af50bfaca274515980 ]

MAX_ADDR_LEN is 32.  ETH_ALEN is 6.  mac->sa_data is a 14 byte array, so
the memcpy() is doing a read past the end of the array.  I asked about
this on netdev and Ben Hutchings told me it's supposed to be copying
ETH_ALEN bytes (thanks Ben).

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/ethernet/micrel/ksz884x.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/micrel/ksz884x.c b/drivers/net/ethernet/micrel/ksz884x.c
index 7ece990..4b9f4bd 100644
--- a/drivers/net/ethernet/micrel/ksz884x.c
+++ b/drivers/net/ethernet/micrel/ksz884x.c
@@ -5679,7 +5679,7 @@ static int netdev_set_mac_address(struct net_device *dev, void *addr)
 		memcpy(hw->override_addr, mac->sa_data, MAC_ADDR_LEN);
 	}
 
-	memcpy(dev->dev_addr, mac->sa_data, MAX_ADDR_LEN);
+	memcpy(dev->dev_addr, mac->sa_data, ETH_ALEN);
 
 	interrupt = hw_block_intr(hw);
 
-- 
1.7.10



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