[PATCH] wifi: mt76: mt7915: guard HE capability lookups

[Ruoyu Wang]

mt7915_mcu_bss_he_tlv() and mt7915_mcu_sta_bfer_tlv() both run after
checking HE support, then dereference the HE PHY capability returned by
mt76_connac_get_he_phy_cap(). That helper can return NULL when no
capability entry matches the vif type.

Fetch the capability before appending the TLV and skip the HE-specific
setup when no matching capability is available.

Fixes: e6d557a78b60 ("mt76: mt7915: rely on mt76_connac_get_phy utilities")
Signed-off-by: Ruoyu Wang <ruoyuw560 at gmail.com>
---
 .../net/wireless/mediatek/mt76/mt7915/mcu.c    | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
index 318c38149463..391c91675130 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
@@ -595,6 +595,8 @@ mt7915_mcu_bss_he_tlv(struct sk_buff *skb, struct ieee80211_vif *vif,
 	struct tlv *tlv;
 
 	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));
 
@@ -1177,13 +1179,12 @@ mt7915_mcu_sta_bfer_vht(struct ieee80211_sta *sta, struct mt7915_phy *phy,
 }
 
 static void
-mt7915_mcu_sta_bfer_he(struct ieee80211_sta *sta, struct ieee80211_vif *vif,
-		       struct mt7915_phy *phy, struct sta_rec_bf *bf)
+mt7915_mcu_sta_bfer_he(struct ieee80211_sta *sta,
+		       const struct ieee80211_sta_he_cap *vc,
+		       struct sta_rec_bf *bf)
 {
 	struct ieee80211_sta_he_cap *pc = &sta->deflink.he_cap;
 	struct ieee80211_he_cap_elem *pe = &pc->he_cap_elem;
-	const struct ieee80211_sta_he_cap *vc =
-		mt76_connac_get_he_phy_cap(phy->mt76, vif);
 	const struct ieee80211_he_cap_elem *ve = &vc->he_cap_elem;
 	u16 mcs_map = le16_to_cpu(pc->he_mcs_nss_supp.rx_mcs_80);
 	u8 nss_mcs = mt7915_mcu_get_sta_nss(mcs_map);
@@ -1242,6 +1243,7 @@ mt7915_mcu_sta_bfer_tlv(struct mt7915_dev *dev, struct sk_buff *skb,
 {
 	struct mt7915_vif *mvif = (struct mt7915_vif *)vif->drv_priv;
 	struct mt7915_phy *phy = mvif->phy;
+	const struct ieee80211_sta_he_cap *vc = NULL;
 	int tx_ant = hweight8(phy->mt76->chainmask) - 1;
 	struct sta_rec_bf *bf;
 	struct tlv *tlv;
@@ -1260,6 +1262,12 @@ mt7915_mcu_sta_bfer_tlv(struct mt7915_dev *dev, struct sk_buff *skb,
 	if (!ebf && !dev->ibf)
 		return;
 
+	if (sta->deflink.he_cap.has_he && ebf) {
+		vc = mt76_connac_get_he_phy_cap(phy->mt76, vif);
+		if (!vc)
+			return;
+	}
+
 	tlv = mt76_connac_mcu_add_tlv(skb, STA_REC_BF, sizeof(*bf));
 	bf = (struct sta_rec_bf *)tlv;
 
@@ -1268,7 +1276,7 @@ mt7915_mcu_sta_bfer_tlv(struct mt7915_dev *dev, struct sk_buff *skb,
 	 * ht: iBF only, since mac80211 lacks of eBF support
 	 */
 	if (sta->deflink.he_cap.has_he && ebf)
-		mt7915_mcu_sta_bfer_he(sta, vif, phy, bf);
+		mt7915_mcu_sta_bfer_he(sta, vc, bf);
 	else if (sta->deflink.vht_cap.vht_supported)
 		mt7915_mcu_sta_bfer_vht(sta, phy, bf, ebf);
 	else if (sta->deflink.ht_cap.ht_supported)