[PATCH] wifi: mt76: Fix NULL Pointer Dereference caused by mt76_connac_get_he_phy_cap()

[Gax-c <zichenxie0106@gmail.com>]

like commit f503ae90c735 ("wifi: mt76: mt7996: fix NULL pointer dereference in mt7996_mcu_sta_bfer_he"), mt76_connac_get_he_phy_cap() may return a NULL pointer, leading to NULL Pointer Dereference.
Add a null check for the returned pointer.

Fixes: a5c372f77aa7 ("wifi: mt76: mt7925: extend mt7925_mcu_bss_he_tlv for per-link BSS")
Fixes: e6d557a78b60 ("mt76: mt7915: rely on mt76_connac_get_phy utilities")
Fixes: 98686cd21624 ("wifi: mt76: mt7996: add driver for MediaTek Wi-Fi 7 (802.11be) devices")
Signed-off-by: Zichen Xie <zichenxie0106@gmail.com>
Reported-by: Zichen Xie <zichenxie0106@gmail.com>
Reported-by: Zijie Zhao <zzjas98@gmail.com>
Reported-by: Chenyuan Yang <chenyuan0y@gmail.com>
---
 drivers/net/wireless/mediatek/mt76/mt7915/mcu.c | 6 ++++++
 drivers/net/wireless/mediatek/mt76/mt7925/mcu.c | 3 +++
 drivers/net/wireless/mediatek/mt76/mt7996/mcu.c | 3 +++
 3 files changed, 12 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
index 87d0dd040001..941a6e40e94c 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
@@ -552,6 +552,9 @@ mt7915_mcu_bss_he_tlv(struct sk_buff *skb, struct ieee80211_vif *vif,
 
 	cap = mt76_connac_get_he_phy_cap(phy->mt76, vif);
 
+	if (!cap)
+		return;
+
 	tlv = mt76_connac_mcu_add_tlv(skb, BSS_INFO_HE_BASIC, sizeof(*he));
 
 	he = (struct bss_info_he *)tlv;
@@ -1145,6 +1148,9 @@ mt7915_mcu_sta_bfer_he(struct ieee80211_sta *sta, struct ieee80211_vif *vif,
 	u8 nss_mcs = mt7915_mcu_get_sta_nss(mcs_map);
 	u8 snd_dim, sts;
 
+	if (!vc)
+		return;
+
 	bf->tx_mode = MT_PHY_TYPE_HE_SU;
 
 	mt7915_mcu_sta_sounding_rate(bf);
diff --git a/drivers/net/wireless/mediatek/mt76/mt7925/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7925/mcu.c
index 748ea6adbc6b..1caf3e3e0e87 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7925/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7925/mcu.c
@@ -2509,6 +2509,9 @@ mt7925_mcu_bss_he_tlv(struct sk_buff *skb, struct ieee80211_bss_conf *link_conf,
 
 	cap = mt76_connac_get_he_phy_cap(phy->mt76, link_conf->vif);
 
+	if (!cap)
+		return;
+
 	tlv = mt76_connac_mcu_add_tlv(skb, UNI_BSS_INFO_HE_BASIC, sizeof(*he));
 
 	he = (struct bss_info_uni_he *)tlv;
diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c
index 6c445a9dbc03..e547729701b7 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c
@@ -799,6 +799,9 @@ mt7996_mcu_bss_he_tlv(struct sk_buff *skb, struct ieee80211_vif *vif,
 
 	cap = mt76_connac_get_he_phy_cap(phy->mt76, vif);
 
+	if (!cap)
+		return;
+
 	tlv = mt7996_mcu_add_uni_tlv(skb, UNI_BSS_INFO_HE_BASIC, sizeof(*he));
 
 	he = (struct bss_info_uni_he *)tlv;
-- 
2.25.1