Commit fc5f7577 authored Dec 30, 2009 by Kalle Valo Committed by John W. Linville Jan 05, 2010

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>

parent 1990ca61

net/mac80211/iface.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -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;
		}