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SubjectRe: [PATCH 2/4] wan/hdlc_x25: fix skb handling
On 2019-04-05 02:32, David Miller wrote:
> From: Martin Schiller <ms@dev.tdt.de>
> Date: Wed, 3 Apr 2019 07:01:16 +0200
>
>> /* X.25 to LAPB */
>> switch (skb->data[0]) {
>> case X25_IFACE_DATA: /* Data to be transmitted */
>> - skb_pull(skb, 1);
>> - if ((result = lapb_data_request(dev, skb)) != LAPB_OK)
>> - dev_kfree_skb(skb);
>> - return NETDEV_TX_OK;
>> + skbn = skb_copy(skb, GFP_ATOMIC);
>> + skb_pull(skbn, 1);
>> + skb_reset_network_header(skbn);
>> + if ((result = lapb_data_request(dev, skbn)) != LAPB_OK)
>> + dev_kfree_skb(skbn);
>
> This leaks 'skb'.

What exactly do you mean?
'skb' will get freed at the end of x25_xmit() function:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/net/wan/hdlc_x25.c#n129

>
> No way I'm applying this stuff.

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