[PATCH 04/10] wifi: mt76: mt7915: validate MURU statistics response

[Jiale Yao]

mt7915_mcu_muru_debug_get() treats the firmware response as a complete
statistics structure without checking its length. A truncated response
can cause out-of-bounds reads while accumulating the counters.

Reject responses shorter than the expected statistics structure.

Fixes: 1966a5078f2d ("mt76: mt7915: add mu-mimo and ofdma debugfs knobs")
Signed-off-by: Jiale Yao <yaojiale02@xxxxxxx>
---
 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 3643906cbdf2..6d777dcfa2c1 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
@@ -2256,6 +2256,10 @@ int mt7915_mcu_muru_debug_get(struct mt7915_phy *phy)
 					&req, sizeof(req), true, &skb);
 	if (ret)
 		return ret;
+	if (skb->len < sizeof(*mu_stats)) {
+		dev_kfree_skb(skb);
+		return -EINVAL;
+	}
 
 	mu_stats = (struct mt7915_mcu_muru_stats *)(skb->data);
 
-- 
2.34.1