mac80211: verify IBSS in interface combinations

Drivers shouldn't attempt to advertise support
for more than one IBSS interface since mac80211
doesn't support that. Check and return an error
from ieee80211_register_hw() in that case.

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

diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 0d7b08d..96ab130 100644 (file)
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -752,11 +752,25 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
        hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
        hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 
-       /* mac80211 doesn't support more than 1 channel */
-       for (i = 0; i < hw->wiphy->n_iface_combinations; i++)
-               if (hw->wiphy->iface_combinations[i].num_different_channels > 1)
+       /*
+        * mac80211 doesn't support more than 1 channel, and also not more
+        * than one IBSS interface
+        */
+       for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
+               const struct ieee80211_iface_combination *c;
+               int j;
+
+               c = &hw->wiphy->iface_combinations[i];
+
+               if (c->num_different_channels > 1)
                        return -EINVAL;
 
+               for (j = 0; j < c->n_limits; j++)
+                       if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
+                           c->limits[j].max > 1)
+                               return -EINVAL;
+       }
+
 #ifndef CONFIG_MAC80211_MESH
        /* mesh depends on Kconfig, but drivers should set it if they want */
        local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);