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Date:	Mon, 19 Mar 2012 09:02:20 +0100
From:	Steffen Klassert <steffen.klassert@...unet.com>
To:	Gao feng <gaofeng@...fujitsu.com>
Cc:	davem@...emloft.net, eric.dumazet@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH] ipv6: fix incorrent ipv6 ipsec packet fragment

On Fri, Mar 16, 2012 at 04:57:15PM +0800, Gao feng wrote:
> Since commit 299b0767(ipv6: Fix IPsec slowpath fragmentation problem)
> In func ip6_append_data,after call skb_put(skb, fraglen + dst_exthdrlen)
> the skb->len contains dst_exthdrlen,and we don't reduce dst_exthdrlen at last
> This will make fraggap>0 in next "while cycle",and cause the size of skb incorrent

Good catch!

> 
> Call skb_pull reduce skb->len before next "while cycle"

I think it would be better to just reserve headroom for
dst_exthdrlen instead of adding and removing data to/from
the skb.

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