[PATCH 04/11] wifi: mt76: mt7921: validate testmode query response

[Jiale Yao]

The testmode query reads both response parameters without checking that
the firmware returned a complete event. A truncated response can cause
out-of-bounds reads.

Reject responses shorter than the testmode event structure.

Fixes: bce844584799 ("mt76: mt7921: introduce testmode support")
Signed-off-by: Jiale Yao <yaojiale02@xxxxxxx>
---
 drivers/net/wireless/mediatek/mt76/mt7921/testmode.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/testmode.c b/drivers/net/wireless/mediatek/mt76/mt7921/testmode.c
index e60ee992edf8..ce95b0db1428 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/testmode.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/testmode.c
@@ -98,6 +98,10 @@ mt7921_tm_query(struct mt792x_dev *dev, struct mt7921_tm_cmd *req,
 					&cmd, sizeof(cmd), true, &skb);
 	if (ret)
 		goto out;
+	if (skb->len < sizeof(*evt)) {
+		ret = -EINVAL;
+		goto out;
+	}
 
 	evt = (struct mt7921_rftest_evt *)skb->data;
 	evt_resp->param0 = le32_to_cpu(evt->param0);
-- 
2.34.1