summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--net/mac80211/key.c20
1 files changed, 17 insertions, 3 deletions
diff --git a/net/mac80211/key.c b/net/mac80211/key.c
index 44388d6a1d8e..88f3fad740bf 100644
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -4,6 +4,7 @@
* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
* Copyright 2007-2008 Johannes Berg <johannes@sipsolutions.net>
* Copyright 2013-2014 Intel Mobile Communications GmbH
+ * Copyright 2017 Intel Deutschland GmbH
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -617,9 +618,6 @@ int ieee80211_key_link(struct ieee80211_key *key,
pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
idx = key->conf.keyidx;
- key->local = sdata->local;
- key->sdata = sdata;
- key->sta = sta;
mutex_lock(&sdata->local->key_mtx);
@@ -630,6 +628,21 @@ int ieee80211_key_link(struct ieee80211_key *key,
else
old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
+ /*
+ * Silently accept key re-installation without really installing the
+ * new version of the key to avoid nonce reuse or replay issues.
+ */
+ if (old_key && key->conf.keylen == old_key->conf.keylen &&
+ !memcmp(key->conf.key, old_key->conf.key, key->conf.keylen)) {
+ ieee80211_key_free_unused(key);
+ ret = 0;
+ goto out;
+ }
+
+ key->local = sdata->local;
+ key->sdata = sdata;
+ key->sta = sta;
+
increment_tailroom_need_count(sdata);
ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
@@ -645,6 +658,7 @@ int ieee80211_key_link(struct ieee80211_key *key,
ret = 0;
}
+ out:
mutex_unlock(&sdata->local->key_mtx);
return ret;