linux-kernel - Re: [PATCH 2/4] wan/hdlc

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Message-Id: <20190404.173240.1338878948110207179.davem@davemloft.net>
Date:   Thu, 04 Apr 2019 17:32:40 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     ms@....tdt.de
Cc:     andrew.hendry@...il.com, khc@...waw.pl, isdn@...ux-pingi.de,
        edumazet@...gle.com, linux-x25@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] wan/hdlc_x25: fix skb handling

From: Martin Schiller <ms@....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'.

No way I'm applying this stuff.