mac80211: warn on some invalid vlan operations

These should never happen, but better warn about them than
crashing a driver, the fact that they never happen is rather
subtle throughout mac80211.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index c532043c1a1..dd838b725af 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -156,6 +156,9 @@ int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
         if (WARN_ON(!netif_running(sdata->dev)))
                 return 0;
 
+        if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
+                return -EINVAL;
+
         if (!local->ops->config_interface)
                 return 0;
 
@@ -321,6 +324,9 @@ void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 {
         struct ieee80211_local *local = sdata->local;
 
+        if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
+                return;
+
         if (!changed)
                 return;