mac80211: count interfaces correctly for combination checks

commit 0f611d28fc2e13cfec64e1c544c16a086886805a upstream.

Since moving the interface combination checks to mac80211, it's
broken because it now only considers interfaces with an assigned
channel context, so for example any interface that isn't active
can still be up, which is clearly an issue; also, in particular
P2P-Device wdevs are an issue since they never have a chanctx.

Fix this by counting running interfaces instead the ones with a
channel context assigned.

Fixes: 73de86a38962b ("cfg80211/mac80211: move interface counting for combination check to mac80211")
Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
[rewrite commit message, dig out the commit it fixes]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index a6cda52ed9203e55047841f1b4a62ab301ecb26e..01fe82e9d1b0ec66a7a20dca403d611c9b0f3ed1 100644 (file)
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -2896,7 +2896,7 @@ int ieee80211_check_combinations(struct ieee80211_sub_if_data *sdata,
                wdev_iter = &sdata_iter->wdev;
 
                if (sdata_iter == sdata ||
-                   rcu_access_pointer(sdata_iter->vif.chanctx_conf) == NULL ||
+                   !ieee80211_sdata_running(sdata_iter) ||
                    local->hw.wiphy->software_iftypes & BIT(wdev_iter->iftype))
                        continue;