[PATCH 05/10] wifi: mt76: mt7915: validate EEPROM response length

[Jiale Yao]

The EEPROM query copies a complete firmware response block without
checking that the response contains the address and data fields. A
truncated response can cause an out-of-bounds read.

Require the complete EEPROM response structure before processing it.

Fixes: e57b7901469f ("mt76: add mac80211 driver for MT7915 PCIe-based chipsets")
Signed-off-by: Jiale Yao <yaojiale02 at 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 6d777dcfa2c1..7009a3a3edd2 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
@@ -2945,6 +2945,10 @@ int mt7915_mcu_get_eeprom(struct mt7915_dev *dev, u32 offset, u8 *read_buf)
 					&req, sizeof(req), true, &skb);
 	if (ret)
 		return ret;
+	if (skb->len < sizeof(*res)) {
+		dev_kfree_skb(skb);
+		return -EINVAL;
+	}
 
 	res = (struct mt7915_mcu_eeprom_info *)skb->data;
 	if (!buf) {
-- 
2.34.1