ksz884x: don't copy too much in netdev_set_mac_address()

[ 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@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/net/ethernet/micrel/ksz884x.c b/drivers/net/ethernet/micrel/ksz884x.c
index 7ece990381c8ff957fe4772a85ed4e71444de735..4b9f4bd14ae31a90e74cda3c7bd2548c2ff94c63 100644 (file)
--- 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);