netdev - Re: missing kfree_skb(skb) in ipv6_frag

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Date:	Mon, 23 Sep 2013 11:37:11 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Templin, Fred L" <Fred.L.Templin@...ing.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: missing kfree_skb(skb) in ipv6_frag_rcv()?

On Mon, 2013-09-23 at 17:42 +0000, Templin, Fred L wrote:
> Hello,
> 
> In the most recent kernel releases, in ./net/ipv6/reassembly.c,
> I see the following code at the end of "ipv6_frag_rcv()":
> 
> +	IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMFAILS);
> +	kfree_skb(skb);
> +	return -1;
> +
> +fail_hdr:
> +	IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INHDRERRORS);
> +	icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, skb_network_header_len(skb));
> +	return -1;
> +}
> 
> Perhaps I missed it, but I did not find anywhere that 'icmpv6_param_prob()'
> frees the skb, and hence it appears that there is a missing kfree_skb()
> in the above code. Is this a bug?

void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos)
{
        icmp6_send(skb, ICMPV6_PARAMPROB, code, pos);
        kfree_skb(skb);
}

Well, I do see kfree_skb(skb) here.


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