netdev - Re: [PATCH] ipv4: ip_do_fragment: fix headroom tests

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Date:   Sat, 15 Jul 2017 14:38:55 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     vvs@...tuozzo.com
Cc:     netdev@...r.kernel.org, kuznet@....inr.ac.ru,
        yoshfuji@...ux-ipv6.org, fw@...len.de, dwmw2@...radead.org,
        devel@...nvz.org
Subject: Re: [PATCH] ipv4: ip_do_fragment: fix headroom tests

From: Vasily Averin <vvs@...tuozzo.com>
Date: Fri, 14 Jul 2017 12:04:16 +0300

> Some time ago David Woodhouse reported skb_under_panic
> when we try to push ethernet header to fragmented ipv6 skbs.
> It was fixed for ipv6 by Florian Westphal in
> commit 1d325d217c7f ("ipv6: ip6_fragment: fix headroom tests and skb leak")
> 
> However similar problem still exist in ipv4.
> 
> It does not trigger skb_under_panic due paranoid check
> in ip_finish_output2, however according to Alexey Kuznetsov
> current state is abnormal and ip_fragment should be fixed too.
> 
> Signed-off-by: Vasily Averin <vvs@...tuozzo.com>

Applied, thank you.