[PATCH] wifi: mt76: mt7921: fix using incorrect group cipher after disconnection.

[Mingyen Hsieh]

From: Michael Lo <michael.lo at mediatek.com>

To avoid incorrect cipher after disconnection, we should
do the key deletion process in this case.

Fixes: e6db67fa871d ("wifi: mt76: ignore key disable commands")
Signed-off-by: Michael Lo <michael.lo at mediatek.com>
Signed-off-by: Ming Yen Hsieh <mingyen.hsieh at mediatek.com>
---
 drivers/net/wireless/mediatek/mt76/mt7921/main.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/main.c b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
index 2e6268cb06c0..4f4577b7e544 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
@@ -537,7 +537,13 @@ static int mt7921_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 	} else {
 		if (idx == *wcid_keyidx)
 			*wcid_keyidx = -1;
-		goto out;
+
+		/* For security issue we don't trigger the key deletion when
+		 * reassociating. But we should trigger the deletion process
+		 * to avoid using incorrect cipher after disconnection,
+		 */
+		if (vif->cfg.assoc)
+			goto out;
 	}
 
 	mt76_wcid_key_setup(&dev->mt76, wcid, key);
-- 
2.18.0