mac80211: fix fast-rx encryption check

[ Upstream commit 622d3b4e39381262da7b18ca1ed1311df227de86 ]

When using WEP, the default unicast key needs to be selected, instead of
the STA PTK.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://lore.kernel.org/r/20201218184718.93650-5-nbd@nbd.name
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 9be82ed02e0e56f72ee374dde5f4434152ffa55d..c38d68131d02ee6c19caa351a93b1915f3ca37f1 100644 (file)
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -3802,6 +3802,8 @@ void ieee80211_check_fast_rx(struct sta_info *sta)
 
        rcu_read_lock();
        key = rcu_dereference(sta->ptk[sta->ptk_idx]);
+       if (!key)
+               key = rcu_dereference(sdata->default_unicast_key);
        if (key) {
                switch (key->conf.cipher) {
                case WLAN_CIPHER_SUITE_TKIP: