cfg80211: validate IBSS BSSID

The IBSS BSSID is never validated, so an
invalid one might end up being used. Fix
this by rejecting invalid configuration.

Reported-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 11089541bb03..430b432bc3f0 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -4527,8 +4527,12 @@ static int nl80211_join_ibss(struct sk_buff *skb, struct genl_info *info)
 
         wiphy = &rdev->wiphy;
 
-        if (info->attrs[NL80211_ATTR_MAC])
+        if (info->attrs[NL80211_ATTR_MAC]) {
                 ibss.bssid = nla_data(info->attrs[NL80211_ATTR_MAC]);
+
+                if (!is_valid_ether_addr(ibss.bssid))
+                        return -EINVAL;
+        }
         ibss.ssid = nla_data(info->attrs[NL80211_ATTR_SSID]);
         ibss.ssid_len = nla_len(info->attrs[NL80211_ATTR_SSID]);