mac80211: fix ieee80211_change_mac() to use struct sockaddr

Setting the mac address from user space was buggy. For example, when
executing this command:

ip link set wlan0 address 00:1f:df:88:cd:55

mac80211 used the address 01:00:00:1f:df:88 instead. It was shifted two
bytes.

The reason was that the addr (type of void *) provided to
ieee80211_change_mac() is actually of type struct sockaddr, not just the
mac address array. Also the call to eth_mac_addr() expects the address to
be struct sockaddr.

Signed-off-by: Kalle Valo <kalle.valo@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 00a1f4ccdaf1..72189661fc49 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -63,15 +63,16 @@ static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 {
         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+        struct sockaddr *sa = addr;
         int ret;
 
         if (ieee80211_sdata_running(sdata))
                 return -EBUSY;
 
-        ret = eth_mac_addr(dev, addr);
+        ret = eth_mac_addr(dev, sa);
 
         if (ret == 0)
-                memcpy(sdata->vif.addr, addr, ETH_ALEN);
+                memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 
         return ret;
 }