[PATCH 2/4] wifi: mt76: mt7925: prevent NULL vif dereference in mt7925_mac_write_txwi

[Mingyen Hsieh]

From: Ming Yen Hsieh <mingyen.hsieh at mediatek.com>

Check for a NULL `vif` before accessing `ieee80211_vif_is_mld(vif)` to
avoid a potential kernel panic in scenarios where `vif` might not be
initialized.

Signed-off-by: Ming Yen Hsieh <mingyen.hsieh at mediatek.com>
---
 drivers/net/wireless/mediatek/mt76/mt7925/mac.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7925/mac.c b/drivers/net/wireless/mediatek/mt76/mt7925/mac.c
index 463288a1dcc7..122aa6e9070a 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7925/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7925/mac.c
@@ -803,8 +803,8 @@ mt7925_mac_write_txwi(struct mt76_dev *dev, __le32 *txwi,
 	txwi[5] = cpu_to_le32(val);
 
 	val = MT_TXD6_DAS | FIELD_PREP(MT_TXD6_MSDU_CNT, 1);
-	if (!ieee80211_vif_is_mld(vif) ||
-	    (q_idx >= MT_LMAC_ALTX0 && q_idx <= MT_LMAC_BCN0))
+	if (vif && (!ieee80211_vif_is_mld(vif) ||
+	    (q_idx >= MT_LMAC_ALTX0 && q_idx <= MT_LMAC_BCN0)))
 		val |= MT_TXD6_DIS_MAT;
 	txwi[6] = cpu_to_le32(val);
 	txwi[7] = 0;
-- 
2.34.1