mac80211: allow interface settings changes only when down

We currently allow monitor flags changes and mesh ID changes when
the interface is up, which can lead to trouble. Change it to only
allow when down.

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

1 files changed, 3 insertions, 0 deletions

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index a8501f14b167..89a183c2327a 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -100,6 +100,9 @@ static int ieee80211_change_iface(struct wiphy *wiphy, int ifindex,
         if (ret)
                 return ret;
 
+        if (netif_running(sdata->dev))
+                return -EBUSY;
+
         if (ieee80211_vif_is_mesh(&sdata->vif) && params->mesh_id_len)
                 ieee80211_sdata_set_mesh_id(sdata,
                                             params->mesh_id_len,