mac80211: move 4-addr sta pointer clearing before synchronize_rcu()

The pointer should be cleared before synchronize_rcu() so that the
consequently dead station won't be found by any lookups in the TX
or RX paths.

Also check that the station is actually the one being removed, the
check is not needed because each 4-addr VLAN can only have a single
station and non-4-addr VLANs always have a NULL pointer there, but
the code is clearer this way (and we avoid the memory write.)

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index 1e147742eccf594421e6d319e1c038394cd94557..557ac250ac10720b0bbd3d7e4fa2f377843bc365 100644 (file)
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -875,6 +875,10 @@ int __must_check __sta_info_destroy(struct sta_info *sta)
 
        drv_sta_pre_rcu_remove(local, sta->sdata, sta);
 
+       if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
+           rcu_access_pointer(sdata->u.vlan.sta) == sta)
+               RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
+
        /* this always calls synchronize_net() */
        ieee80211_free_sta_keys(local, sta);
 
@@ -883,9 +887,6 @@ int __must_check __sta_info_destroy(struct sta_info *sta)
        local->num_sta--;
        local->sta_generation++;
 
-       if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
-               RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
-
        while (sta->sta_state > IEEE80211_STA_NONE) {
                ret = sta_info_move_state(sta, sta->sta_state - 1);
                if (ret) {