linux-kernel - [PATCH v3] Bluetooth: btusb: Fix memory leak in btusb_mtk_wmt

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Message-Id: <20210203080716.5632-1-zjp734690220@163.com>
Date:   Wed,  3 Feb 2021 16:07:16 +0800
From:   zjp734690220@....com
To:     marcel@...tmann.org, johan.hedberg@...il.com, luiz.dentz@...il.com
Cc:     Markus.Elfring@....de, linux-bluetooth@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jupeng Zhong <zhongjupeng@...ong.com>
Subject: [PATCH v3] Bluetooth: btusb: Fix memory leak in btusb_mtk_wmt_recv

From: Jupeng Zhong <zhongjupeng@...ong.com>

In btusb_mtk_wmt_recv if skb_clone fails, the alocated memory
should be free.

Omit the labels "err_out" and "err_free_skb" in this function
implementation so that the desired exception handling code
convert usage of two labels to direct code specification.

Fixes: a1c49c434e15 ("btusb: Add protocol support for MediaTek MT7668U USB devices")
Signed-off-by: Jupeng Zhong <zhongjupeng@...ong.com>
---
v3: update the patch description
v2: omit the labels "err_out" and "err_free_skb", and
    update the patch "From:" and "Signed-off-by:"
---
 drivers/bluetooth/btusb.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 5064b1d79c79..e8ab400e62a7 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -3200,7 +3200,7 @@ static void btusb_mtk_wmt_recv(struct urb *urb)
 		skb = bt_skb_alloc(HCI_WMT_MAX_EVENT_SIZE, GFP_ATOMIC);
 		if (!skb) {
 			hdev->stat.err_rx++;
-			goto err_out;
+			return;
 		}
 
 		hci_skb_pkt_type(skb) = HCI_EVENT_PKT;
@@ -3218,13 +3218,18 @@ static void btusb_mtk_wmt_recv(struct urb *urb)
 		 */
 		if (test_bit(BTUSB_TX_WAIT_VND_EVT, &data->flags)) {
 			data->evt_skb = skb_clone(skb, GFP_ATOMIC);
-			if (!data->evt_skb)
-				goto err_out;
+			if (!data->evt_skb) {
+				kfree_skb(skb);
+				return;
+			}
 		}
 
 		err = hci_recv_frame(hdev, skb);
-		if (err < 0)
-			goto err_free_skb;
+		if (err < 0) {
+			kfree_skb(data->evt_skb);
+			data->evt_skb = NULL;
+			return;
+		}
 
 		if (test_and_clear_bit(BTUSB_TX_WAIT_VND_EVT,
 				       &data->flags)) {
@@ -3233,11 +3238,6 @@ static void btusb_mtk_wmt_recv(struct urb *urb)
 			wake_up_bit(&data->flags,
 				    BTUSB_TX_WAIT_VND_EVT);
 		}
-err_out:
-		return;
-err_free_skb:
-		kfree_skb(data->evt_skb);
-		data->evt_skb = NULL;
 		return;
 	} else if (urb->status == -ENOENT) {
 		/* Avoid suspend failed when usb_kill_urb */
-- 
1.9.1