mac80211: Fix race between ieee80211_rx_bss_put and lookup routines.

The put routine first decrements the users counter and then
(if it is zero) locks the sta_bss_lock and removes one from
the list and the hash.

Thus, any of ieee80211_sta_config_auth, ieee80211_rx_bss_get
or ieee80211_rx_mesh_bss_get can race with it by finding a
bss that is about to get kfree-ed.

Using atomic_dec_and_lock in ieee80211_rx_bss_put takes care
of this race.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index c0a5345c8a61..a5e5c31c23ab 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -2248,10 +2248,13 @@ static void ieee80211_rx_bss_put(struct net_device *dev,
                                  struct ieee80211_sta_bss *bss)
 {
         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
-        if (!atomic_dec_and_test(&bss->users))
+
+        local_bh_disable();
+        if (!atomic_dec_and_lock(&bss->users, &local->sta_bss_lock)) {
+                local_bh_enable();
                 return;
+        }
 
-        spin_lock_bh(&local->sta_bss_lock);
         __ieee80211_rx_bss_hash_del(dev, bss);
         list_del(&bss->list);
         spin_unlock_bh(&local->sta_bss_lock);