linux-kernel - [PATCH AUTOSEL 5.16 154/217] mt76: connac: fix a theoretical NULL pointer dereference in mt76_connac_get_phy

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Date:   Mon, 17 Jan 2022 21:18:37 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Lorenzo Bianconi <lorenzo@...nel.org>,
        Felix Fietkau <nbd@....name>, Sasha Levin <sashal@...nel.org>,
        lorenzo.bianconi83@...il.com, ryder.lee@...iatek.com,
        kvalo@...nel.org, davem@...emloft.net, kuba@...nel.org,
        matthias.bgg@...il.com, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.16 154/217] mt76: connac: fix a theoretical NULL pointer dereference in mt76_connac_get_phy_mode

From: Lorenzo Bianconi <lorenzo@...nel.org>

[ Upstream commit c9dbeac4988f6d4c4211b3747ec9c9c75ea87967 ]

Even if it is not a real bug since mt76_connac_get_phy_mode runs just
for mt7921 where only STA is supported, fix a theoretical NULL pointer
dereference if new added modes do not support HE

Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
Signed-off-by: Felix Fietkau <nbd@....name>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
index 26b4b875dcc02..bcb596664b3e9 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
@@ -1179,7 +1179,7 @@ mt76_connac_get_phy_mode(struct mt76_phy *phy, struct ieee80211_vif *vif,
 		if (ht_cap->ht_supported)
 			mode |= PHY_MODE_GN;
 
-		if (he_cap->has_he)
+		if (he_cap && he_cap->has_he)
 			mode |= PHY_MODE_AX_24G;
 	} else if (band == NL80211_BAND_5GHZ || band == NL80211_BAND_6GHZ) {
 		mode |= PHY_MODE_A;
@@ -1190,7 +1190,7 @@ mt76_connac_get_phy_mode(struct mt76_phy *phy, struct ieee80211_vif *vif,
 		if (vht_cap->vht_supported)
 			mode |= PHY_MODE_AC;
 
-		if (he_cap->has_he) {
+		if (he_cap && he_cap->has_he) {
 			if (band == NL80211_BAND_6GHZ)
 				mode |= PHY_MODE_AX_6G;
 			else
-- 
2.34.1