linux-kernel - [PATCH 5.4 22/32] mac80211: fix fast-rx encryption check

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Date:   Fri,  5 Feb 2021 15:07:37 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Felix Fietkau <nbd@....name>,
        Johannes Berg <johannes.berg@...el.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 22/32] mac80211: fix fast-rx encryption check

From: Felix Fietkau <nbd@....name>

[ 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@....name>
Link: https://lore.kernel.org/r/20201218184718.93650-5-nbd@nbd.name
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/mac80211/rx.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 3ab85e1e38d82..1a15e7bae106a 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -4080,6 +4080,8 @@ 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:
-- 
2.27.0