[PATCH 5.16 0923/1017] can: mcba_usb: mcba_usb_start_xmit(): fix double dev_kfree_skb in error path

From: Greg Kroah-Hartman
Date: Tue Apr 05 2022 - 09:51:21 EST


From: Hangyu Hua <hbh25y@xxxxxxxxx>

commit 04c9b00ba83594a29813d6b1fb8fdc93a3915174 upstream.

There is no need to call dev_kfree_skb() when usb_submit_urb() fails
because can_put_echo_skb() deletes original skb and
can_free_echo_skb() deletes the cloned skb.

Fixes: 51f3baad7de9 ("can: mcba_usb: Add support for Microchip CAN BUS Analyzer")
Link: https://lore.kernel.org/all/20220311080208.45047-1-hbh25y@xxxxxxxxx
Signed-off-by: Hangyu Hua <hbh25y@xxxxxxxxx>
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/can/usb/mcba_usb.c | 1 -
1 file changed, 1 deletion(-)

--- a/drivers/net/can/usb/mcba_usb.c
+++ b/drivers/net/can/usb/mcba_usb.c
@@ -368,7 +368,6 @@ static netdev_tx_t mcba_usb_start_xmit(s
xmit_failed:
can_free_echo_skb(priv->netdev, ctx->ndx, NULL);
mcba_usb_free_ctx(ctx);
- dev_kfree_skb(skb);
stats->tx_dropped++;

return NETDEV_TX_OK;