Re: [PATCH] can: usb: fix a possible memory leak in esd_usb2_start_xmit

[Marc Kleine-Budde]

On 28.02.2022 10:05:03, Hangyu Hua wrote:
> I get it. But this means ems_usb_start_xmit have a redundant
> dev_kfree_skb beacause can_put_echo_skb delete original skb and
> can_free_echo_skb delete the cloned skb. While this code is harmless
> do you think we need to delete it ?

ACK. This dev_kfree_skb() should be deleted:

| 	err = usb_submit_urb(urb, GFP_ATOMIC);
| 	if (unlikely(err)) {
| 		can_free_echo_skb(netdev, context->echo_index, NULL);
| 
| 		usb_unanchor_urb(urb);
| 		usb_free_coherent(dev->udev, size, buf, urb->transfer_dma);
| 		dev_kfree_skb(skb);

Can you create a patch?

regards,
Marc

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