From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: [PATCHv2 net-next] netlink: allow large data transfers from
 user-space
Date: Mon, 03 Jun 2013 10:12:39 -0700
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Cc: netdev@vger.kernel.org, davem@davemloft.net, kaber@trash.net
To: Pablo Neira Ayuso <pablo@netfilter.org>
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On Mon, 2013-06-03 at 18:39 +0200, Pablo Neira Ayuso wrote:

> +	if (is_vmalloc_addr(skb->head)) {
> +		vfree(skb->head);
> +		skb->data = NULL;
> +	}
>  

You probably meant :

	skb->head = NULL;

Now, cross our fingers we do not skb_orphan() these skb too early :)