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mac80211: flush keys for AP mode on ieee80211_do_stop

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Userspace can add keys to an AP mode interface before start_ap has been
called. If there have been no calls to start_ap/stop_ap in the mean
time, the keys will still be around when the interface is brought down.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
[adjust comments, fix AP_VLAN case]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Felix Fietkau 2014-10-27 11:56:06 +01:00 committed by Johannes Berg
parent 805dbe17d1
commit 10b6848786
1 changed files with 6 additions and 5 deletions
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11
net/mac80211/iface.c
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@ -898,6 +898,8 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
list_del(&sdata->u.vlan.list);
mutex_unlock(&local->mtx);
RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
/* see comment in the default case below */
ieee80211_free_keys(sdata, true);
/* no need to tell driver */
break;
case NL80211_IFTYPE_MONITOR:
@ -923,17 +925,16 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
/*
* When we get here, the interface is marked down.
* Free the remaining keys, if there are any
* (shouldn't be, except maybe in WDS mode?)
* (which can happen in AP mode if userspace sets
* keys before the interface is operating, and maybe
* also in WDS mode)
*
* Force the key freeing to always synchronize_net()
* to wait for the RX path in case it is using this
* interface enqueuing frames * at this very time on
* interface enqueuing frames at this very time on
* another CPU.
*/
ieee80211_free_keys(sdata, true);
/* fall through */
case NL80211_IFTYPE_AP:
skb_queue_purge(&sdata->skb_queue);
}