check sta_rates pointer in sta_rate_tbl_update callback

Fix potential NULL pointer dereference issue.

Lorenzo Bianconi (2):
mt76: mt7603: check sta_rates pointer in mt7603_sta_rate_tbl_update
mt76: mt7615: check sta_rates pointer in mt7615_sta_rate_tbl_update

 drivers/net/wireless/mediatek/mt76/mt7603/main.c | 3 +++
 drivers/net/wireless/mediatek/mt76/mt7615/main.c | 3 +++
 2 files changed, 6 insertions(+)

2.34.1

Check sta_rates pointer value in mt7603_sta_rate_tbl_update routine since minstrel_ht_update_rates can fail allocating rates array.

---
 drivers/net/wireless/mediatek/mt76/mt7603/main.c | 3 +++
 1 file changed, 3 insertions(+)

index 2b546bc05d82..83c5eec5b163 100644
@@ -641,6 +641,9 @@ mt7603_sta_rate_tbl_update(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 	struct ieee80211_sta_rates *sta_rates = rcu_dereference(sta->rates);
 	int i;
 
+	if (!sta_rates)
+		return;
+
 	spin_lock_bh(&dev->mt76.lock);
 	for (i = 0; i < ARRAY_SIZE(msta->rates); i++) {
 		msta->rates[i].idx = sta_rates->rate[i].idx;

2.34.1

Check sta_rates pointer value in mt7615_sta_rate_tbl_update routine since minstrel_ht_update_rates can fail allocating rates array.

---
 drivers/net/wireless/mediatek/mt76/mt7615/main.c | 3 +++
 1 file changed, 3 insertions(+)

index 9f7ac78f1222..fca38f0e1a27 100644
@@ -689,6 +689,9 @@ static void mt7615_sta_rate_tbl_update(struct ieee80211_hw *hw,
 	struct ieee80211_sta_rates *sta_rates = rcu_dereference(sta->rates);
 	int i;
 
+	if (!sta_rates)
+		return;
+
 	spin_lock_bh(&dev->mt76.lock);
 	for (i = 0; i < ARRAY_SIZE(msta->rates); i++) {
 		msta->rates[i].idx = sta_rates->rate[i].idx;

2.34.1