[PATCH v2 3/3] wifi: mt76: mt7915: check the correctness of event data

[Ryder Lee]

The mcu event might not be reliable, so check the correctness of data
before handling it.

Signed-off-by: Ryder Lee <ryder.lee at mediatek.com>
---
 .../net/wireless/mediatek/mt76/mt7915/mcu.c   | 21 +++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
index 86ec767266cc..37a3c1f082d9 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
@@ -232,8 +232,11 @@ 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])
+	    dev->mt76.phys[MT_BAND1])
 		mphy = dev->mt76.phys[MT_BAND1];
 
 	ieee80211_iterate_active_interfaces_atomic(mphy->hw,
@@ -252,8 +255,11 @@ 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])
+	    dev->mt76.phys[MT_BAND1])
 		mphy = dev->mt76.phys[MT_BAND1];
 
 	phy = (struct mt7915_phy *)mphy->priv;
@@ -268,8 +274,11 @@ 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])
+	    dev->mt76.phys[MT_BAND1])
 		mphy = dev->mt76.phys[MT_BAND1];
 
 	if (r->band_idx == MT_RX_SEL2)
@@ -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,
-- 
2.18.0