cfg80211: validate AID of stations being added
We have some validation code in mac80211 but said code will
force an invalid AID to 0 which isn't a valid AID either;
instead require a valid AID (1-2007) to be passed in from
userspace in cfg80211 already. Also move the code before
the race comment since it can only be executed during STA
addition and thus is not racy.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 77e9ff5..cdfdb2e 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -664,18 +664,19 @@
spin_unlock_bh(&sta->lock);
/*
+ * cfg80211 validates this (1-2007) and allows setting the AID
+ * only when creating a new station entry
+ */
+ if (params->aid)
+ sta->sta.aid = params->aid;
+
+ /*
* FIXME: updating the following information is racy when this
* function is called from ieee80211_change_station().
* However, all this information should be static so
* maybe we should just reject attemps to change it.
*/
- if (params->aid) {
- sta->sta.aid = params->aid;
- if (sta->sta.aid > IEEE80211_MAX_AID)
- sta->sta.aid = 0; /* XXX: should this be an error? */
- }
-
if (params->listen_interval >= 0)
sta->listen_interval = params->listen_interval;
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 4b4d3c8..19dc796 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -1738,7 +1738,11 @@
nla_len(info->attrs[NL80211_ATTR_STA_SUPPORTED_RATES]);
params.listen_interval =
nla_get_u16(info->attrs[NL80211_ATTR_STA_LISTEN_INTERVAL]);
+
params.aid = nla_get_u16(info->attrs[NL80211_ATTR_STA_AID]);
+ if (!params.aid || params.aid > IEEE80211_MAX_AID)
+ return -EINVAL;
+
if (info->attrs[NL80211_ATTR_HT_CAPABILITY])
params.ht_capa =
nla_data(info->attrs[NL80211_ATTR_HT_CAPABILITY]);