mac80211: return if IBSS chandef can not be used

This was originally designed to fail when a 40+/40- mode can not be
used, but basic modes (such as 5/10/20 MHz) must be handled
with an error.

Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>

diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
index 8fa1c27..449702d 100644 (file)
--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -85,6 +85,14 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 
        chandef = ifibss->chandef;
        if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) {
+               if (chandef.width == NL80211_CHAN_WIDTH_5 ||
+                   chandef.width == NL80211_CHAN_WIDTH_10 ||
+                   chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
+                   chandef.width == NL80211_CHAN_WIDTH_20) {
+                       sdata_info(sdata,
+                                  "Failed to join IBSS, beacons forbidden\n");
+                       return;
+               }
                chandef.width = NL80211_CHAN_WIDTH_20;
                chandef.center_freq1 = chan->center_freq;
        }