[PATCH net] mt76: mt7615: Fix memory leak in mt7615_mcu_wtbl_sta_add()

[Zilin Guan]

In mt7615_mcu_wtbl_sta_add(), an skb sskb is allocated. If the
subsequent call to mt76_connac_mcu_alloc_wtbl_req() fails, the function
returns an error without freeing sskb, leading to a memory leak.

Fix this by calling dev_kfree_skb() on sskb in the error handling path
to ensure it is properly released.

Fixes: 99c457d902cf9 ("mt76: mt7615: move mt7615_mcu_set_bmc to mt7615_mcu_ops")
Signed-off-by: Zilin Guan <zilin at seu.edu.cn>
---
 drivers/net/wireless/mediatek/mt76/mt7615/mcu.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7615/mcu.c
index 4064e193d4de..08ee2e861c4e 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/mcu.c
@@ -874,8 +874,10 @@ mt7615_mcu_wtbl_sta_add(struct mt7615_phy *phy, struct ieee80211_vif *vif,
 	wtbl_hdr = mt76_connac_mcu_alloc_wtbl_req(&dev->mt76, &msta->wcid,
 						  WTBL_RESET_AND_SET, NULL,
 						  &wskb);
-	if (IS_ERR(wtbl_hdr))
+	if (IS_ERR(wtbl_hdr)) {
+		dev_kfree_skb(sskb);
 		return PTR_ERR(wtbl_hdr);
+	}
 
 	if (enable) {
 		mt76_connac_mcu_wtbl_generic_tlv(&dev->mt76, wskb, vif, sta,
-- 
2.34.1