[PATCH v3] Bluetooth: btusb: Fix memory leak in btusb_mtk_wmt_recv

[zjp734690220]

From: Jupeng Zhong <zhongjup...@yulong.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 <zhongjup...@yulong.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