cfg80211: reject invalid IBSS BSSIDs in wext compat code

Don't allow using a multicast address as the BSSID, that
isn't a valid configuration.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/net/wireless/ibss.c b/net/wireless/ibss.c
index e16cc132c58a..f55f6ffcfcec 100644
--- a/net/wireless/ibss.c
+++ b/net/wireless/ibss.c
@@ -481,6 +481,9 @@ int cfg80211_ibss_wext_siwap(struct net_device *dev,
         if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
                 bssid = NULL;
 
+        if (bssid && !is_valid_ether_addr(bssid))
+                return -EINVAL;
+
         /* both automatic */
         if (!bssid && !wdev->wext.ibss.bssid)
                 return 0;