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mac80211: fix AP/VLAN PS buffer race 

When an AP interface is removed without the
AP/VLAN interfaces having been removed before
already, the AP-VLAN interface might still
have sleeping stations and buffer multicast
frames which will happen on the AP interface.
Thus, we need to remove AP/VLAN interfaces
before purging buffered broadcast frames.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2011-09-20 17:40:51 +02:00 committed by John W. Linville
parent da3ba88a99
commit 6f2d93353a
1 changed files with 4 additions and 6 deletions
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10
net/mac80211/iface.c
View File

@ -460,17 +460,15 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
synchronize_rcu();
kfree(old_beacon);
/* free all potentially still buffered bcast frames */
while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
local->total_ps_buffered--;
dev_kfree_skb(skb);
}
/* down all dependent devices, that is VLANs */
list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
u.vlan.list)
dev_close(vlan->dev);
WARN_ON(!list_empty(&sdata->u.ap.vlans));
/* free all potentially still buffered bcast frames */
local->total_ps_buffered -= skb_queue_len(&sdata->u.ap.ps_bc_buf);
skb_queue_purge(&sdata->u.ap.ps_bc_buf);
}
if (going_down)