[PATCH 3/6] wifi: mt76: mt7996: add missing check for rx wcid entries

[Felix Fietkau <nbd@nbd.name>]

Non-station wcid entries must not be passed to the rx functions.
In case of the global wcid entry, it could even lead to corruption in the wcid
array due to pointer being casted to struct mt7996_sta_link using container_of.

Fixes: 7464b12b7d92 ("wifi: mt76: mt7996: rework mt7996_rx_get_wcid to support MLO")
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 drivers/net/wireless/mediatek/mt76/mt7996/mac.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/mac.c b/drivers/net/wireless/mediatek/mt76/mt7996/mac.c
index 837deb41ae13..b3fcca9bbb95 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7996/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7996/mac.c
@@ -62,7 +62,7 @@ static struct mt76_wcid *mt7996_rx_get_wcid(struct mt7996_dev *dev,
 	int i;
 
 	wcid = mt76_wcid_ptr(dev, idx);
-	if (!wcid)
+	if (!wcid || !wcid->sta)
 		return NULL;
 
 	if (!mt7996_band_valid(dev, band_idx))
-- 
2.51.0