linux-kernel - [PATCH] wifi: mt76: mt7996: fix NULL pointer dereference in mt7996_mcu_sta_bfer

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Message-Id: <20240829083026.3195359-1-make24@iscas.ac.cn>
Date: Thu, 29 Aug 2024 16:30:26 +0800
From: Ma Ke <make24@...as.ac.cn>
To: nbd@....name,
	lorenzo@...nel.org,
	ryder.lee@...iatek.com,
	shayne.chen@...iatek.com,
	sean.wang@...iatek.com,
	kvalo@...nel.org,
	matthias.bgg@...il.com,
	angelogioacchino.delregno@...labora.com,
	chui-hao.chiu@...iatek.com,
	howard-yh.hsu@...iatek.com,
	StanleyYP.Wang@...iatek.com,
	benjamin-jw.lin@...iatek.com,
	allen.ye@...iatek.com,
	chank.chen@...iatek.com,
	meichia.chiu@...iatek.com
Cc: linux-wireless@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	Ma Ke <make24@...as.ac.cn>,
	stable@...r.kernel.org
Subject: [PATCH] wifi: mt76: mt7996: fix NULL pointer dereference in mt7996_mcu_sta_bfer_eht

Fix the NULL pointer dereference in mt7996_mcu_sta_bfer_eht.

Found by code review.

Cc: stable@...r.kernel.org
Fixes: ba01944adee9 ("wifi: mt76: mt7996: add EHT beamforming support")
Signed-off-by: Ma Ke <make24@...as.ac.cn>
---
 drivers/net/wireless/mediatek/mt76/mt7996/mcu.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c
index 2e4fa9f48dfb..d0fe2505ddbf 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c
@@ -1605,6 +1605,9 @@ mt7996_mcu_sta_bfer_eht(struct ieee80211_sta *sta, struct ieee80211_vif *vif,
 				 IEEE80211_EHT_MCS_NSS_RX) - 1;
 	u8 snd_dim, sts;
 
+	if (!vc)
+		return;
+
 	bf->tx_mode = MT_PHY_TYPE_EHT_MU;
 
 	mt7996_mcu_sta_sounding_rate(bf);
-- 
2.25.1