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cfg80211/mac80211: correct qos-map locking 

Since the RTNL can't always be held, use wdev/sdata locking for
the qos-map dereference in mac80211. This requires cfg80211 to
consistently lock it, which it was missing in one place.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2013-12-30 23:12:37 +01:00
parent 32db6b54df
commit 194ff52d42
2 changed files with 3 additions and 1 deletions
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2
net/mac80211/cfg.c
View File

@ -3854,7 +3854,7 @@ static int ieee80211_set_qos_map(struct wiphy *wiphy,
new_qos_map = NULL;
}
old_qos_map = rtnl_dereference(sdata->qos_map);
old_qos_map = sdata_dereference(sdata->qos_map, sdata);
rcu_assign_pointer(sdata->qos_map, new_qos_map);
if (old_qos_map)
kfree_rcu(old_qos_map, rcu_head);

2
net/wireless/util.c
View File

@ -879,7 +879,9 @@ int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
dev->ieee80211_ptr->use_4addr = false;
dev->ieee80211_ptr->mesh_id_up_len = 0;
wdev_lock(dev->ieee80211_ptr);
rdev_set_qos_map(rdev, dev, NULL);
wdev_unlock(dev->ieee80211_ptr);
switch (otype) {
case NL80211_IFTYPE_AP: