[PATCH 08/10] wifi: mt76: mt7915: validate RX rate response length

[Jiale Yao <yaojiale02@163.com>]

The RX rate query reads a complete PHY information structure without
checking the response length. A truncated firmware response can cause
out-of-bounds reads while decoding the rate.

Require the complete PHY RX information structure before using it.

Fixes: 11553d88d0b9 ("mt76: mt7915: query station rx rate from firmware")
Signed-off-by: Jiale Yao <yaojiale02@163.com>
---
 drivers/net/wireless/mediatek/mt76/mt7915/mcu.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
index 955c0e6c7cb6..00a528694255 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
@@ -3942,6 +3942,10 @@ int mt7915_mcu_get_rx_rate(struct mt7915_phy *phy, struct ieee80211_vif *vif,
 					&req, sizeof(req), true, &skb);
 	if (ret)
 		return ret;
+	if (skb->len < sizeof(*res)) {
+		dev_kfree_skb(skb);
+		return -EINVAL;
+	}
 
 	res = (struct mt7915_mcu_phy_rx_info *)skb->data;
 
-- 
2.34.1