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authorJohannes Berg <johannes@sipsolutions.net>2008-02-25 16:27:46 +0100
committerJohn W. Linville <linville@tuxdriver.com>2008-03-06 15:30:46 -0500
commitd0709a65181beb787ef3f58cfe45536a2bb254c8 (patch)
tree29e5f36583b0e0a3f11b291347e57672eab41dad /net/mac80211/key.c
parent5cf121c3cdb955583bf0c5d28c992b7968a4aa1a (diff)
downloadop-kernel-dev-d0709a65181beb787ef3f58cfe45536a2bb254c8.zip
op-kernel-dev-d0709a65181beb787ef3f58cfe45536a2bb254c8.tar.gz
mac80211: RCU-ify STA info structure access
This makes access to the STA hash table/list use RCU to protect against freeing of items. However, it's not a true RCU, the copy step is missing: whenever somebody changes a STA item it is simply updated. This is an existing race condition that is now somewhat understandable. This patch also fixes the race key freeing vs. STA destruction by making sure that sta_info_destroy() is always called under RTNL and frees the key. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/key.c')
-rw-r--r--net/mac80211/key.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/net/mac80211/key.c b/net/mac80211/key.c
index eac9c59..df0c04c 100644
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -240,14 +240,17 @@ void ieee80211_key_link(struct ieee80211_key *key,
if (sdata->vif.type == IEEE80211_IF_TYPE_STA) {
struct sta_info *ap;
+ rcu_read_lock();
+
/* same here, the AP could be using QoS */
ap = sta_info_get(key->local, key->sdata->u.sta.bssid);
if (ap) {
if (ap->flags & WLAN_STA_WME)
key->conf.flags |=
IEEE80211_KEY_FLAG_WMM_STA;
- sta_info_put(ap);
}
+
+ rcu_read_unlock();
}
}
@@ -290,6 +293,9 @@ void ieee80211_key_free(struct ieee80211_key *key)
__ieee80211_key_replace(key->sdata, key->sta,
key, NULL);
+ /*
+ * Do NOT remove this without looking at sta_info_destroy()
+ */
synchronize_rcu();
/*
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