[PATCH 6/7] wifi: mt76: mt7996: validate temperature response length

[Jiale Yao]

The temperature query reads a fixed firmware event without checking the
response length. A truncated response can cause an out-of-bounds read.

Require the complete thermal event before accessing its temperature.

Fixes: 6879b2e94172 ("wifi: mt76: mt7996: add thermal sensor device support")
Signed-off-by: Jiale Yao <yaojiale02 at 163.com>
---
 drivers/net/wireless/mediatek/mt76/mt7996/mcu.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c
index 5391666553d9..d87851c5fc1d 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c
@@ -4702,6 +4702,10 @@ int mt7996_mcu_get_temperature(struct mt7996_phy *phy)
 					&req, sizeof(req), true, &skb);
 	if (ret)
 		return ret;
+	if (skb->len < sizeof(*res)) {
+		dev_kfree_skb(skb);
+		return -EINVAL;
+	}
 
 	res = (void *)skb->data;
 	temp = le32_to_cpu(res->temperature);
-- 
2.34.1