wifi: mt76: mt7915: check the correctness of event data

The mcu event might not be reliable, so check the correctness of data
before handling it.
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7915/mcu.c

@@ -232,6 +232,9 @@ mt7915_mcu_rx_csa_notify(struct mt7915_dev *dev, struct sk_buff *skb)
 
 	c = (struct mt7915_mcu_csa_notify *)skb->data;
 
+	if (c->band_idx > MT_BAND1)
+		return;
+
 	if ((c->band_idx && !dev->phy.mt76->band_idx) &&
 	    dev->mt76.phys[MT_BAND1])
 		mphy = dev->mt76.phys[MT_BAND1];
@@ -252,6 +255,9 @@ mt7915_mcu_rx_thermal_notify(struct mt7915_dev *dev, struct sk_buff *skb)
 	if (t->ctrl.ctrl_id != THERMAL_PROTECT_ENABLE)
 		return;
 
+	if (t->ctrl.band_idx > MT_BAND1)
+		return;
+
 	if ((t->ctrl.band_idx && !dev->phy.mt76->band_idx) &&
 	    dev->mt76.phys[MT_BAND1])
 		mphy = dev->mt76.phys[MT_BAND1];
@@ -268,6 +274,9 @@ mt7915_mcu_rx_radar_detected(struct mt7915_dev *dev, struct sk_buff *skb)
 
 	r = (struct mt7915_mcu_rdd_report *)skb->data;
 
+	if (r->band_idx > MT_BAND1)
+		return;
+
 	if ((r->band_idx && !dev->phy.mt76->band_idx) &&
 	    dev->mt76.phys[MT_BAND1])
 		mphy = dev->mt76.phys[MT_BAND1];
@@ -326,7 +335,11 @@ mt7915_mcu_rx_bcc_notify(struct mt7915_dev *dev, struct sk_buff *skb)
 
 	b = (struct mt7915_mcu_bcc_notify *)skb->data;
 
-	if ((b->band_idx && !dev->phy.mt76->band_idx) && dev->mt76.phys[MT_BAND1])
+	if (b->band_idx > MT_BAND1)
+		return;
+
+	if ((b->band_idx && !dev->phy.mt76->band_idx) &&
+	    dev->mt76.phys[MT_BAND1])
 		mphy = dev->mt76.phys[MT_BAND1];
 
 	ieee80211_iterate_active_interfaces_atomic(mphy->hw,