netdev - [patch] ksz884x: don't copy too much in netdev_set_mac

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Message-ID: <20120419070018.GA16645@elgon.mountain>
Date:	Thu, 19 Apr 2012 10:00:19 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	Tristram.Ha@...rel.com, Ben Hutchings <bhutchings@...arflare.com>,
	netdev@...r.kernel.org
Subject: [patch] ksz884x: don't copy too much in netdev_set_mac_address()

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>

diff --git a/drivers/net/ethernet/micrel/ksz884x.c b/drivers/net/ethernet/micrel/ksz884x.c
index ef723b1..eaf9ff0 100644
--- a/drivers/net/ethernet/micrel/ksz884x.c
+++ b/drivers/net/ethernet/micrel/ksz884x.c
@@ -5675,7 +5675,7 @@ static int netdev_set_mac_address(struct net_device *dev, void *addr)
 		memcpy(hw->override_addr, mac->sa_data, ETH_ALEN);
 	}
 
-	memcpy(dev->dev_addr, mac->sa_data, MAX_ADDR_LEN);
+	memcpy(dev->dev_addr, mac->sa_data, ETH_ALEN);
 
 	interrupt = hw_block_intr(hw);
 
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