[PATCH 08/19] wifi: mt76: mt7925: validate mlink in sta_hdr_trans_tlv()

[Sean Wang <sean.wang@kernel.org>]

From: Sean Wang <sean.wang@mediatek.com>

Replace the dead wcid NULL check in mt7925_mcu_sta_hdr_trans_tlv() with
a WARN_ON_ONCE() guard on mlink before dereferencing mlink->wcid.

wcid is always derived from mlink, so mlink is the only meaningful
object to validate here.

Signed-off-by: Sean Wang <sean.wang@mediatek.com>
---
 drivers/net/wireless/mediatek/mt76/mt7925/mcu.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7925/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7925/mcu.c
index c474dd358650..03515b891643 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7925/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7925/mcu.c
@@ -1082,11 +1082,11 @@ mt7925_mcu_sta_hdr_trans_tlv(struct sk_buff *skb,
 	else
 		hdr_trans->from_ds = true;
 
-	wcid = &mlink->wcid;
-
-	if (!wcid)
+	if (WARN_ON_ONCE(!mlink))
 		return;
 
+	wcid = &mlink->wcid;
+
 	hdr_trans->dis_rx_hdr_tran = !test_bit(MT_WCID_FLAG_HDR_TRANS, &wcid->flags);
 	if (test_bit(MT_WCID_FLAG_4ADDR, &wcid->flags)) {
 		hdr_trans->to_ds = true;
-- 
2.43.0