netdev - Re: af_packet: when sending ethernet frames, parse header for skb->protocol

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Message-Id: <20130808211943.EA1E8226BB@mail.nwl.cc>
Date:	Thu, 8 Aug 2013 23:19:38 +0200
From:	Phil Sutter <phil@....cc>
To:	Andrew Vagin <avagin@...il.com>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: af_packet: when sending ethernet frames, parse header for
 skb->protocol

Hi,

On Thu, Aug 08, 2013 at 02:03:03AM +0400, Andrew Vagin wrote:
> I compiled the akpm branch of linux-next and found that my virtual
> machine didn't get an IP address by dhcp.
> 
> git bisect said that the problem is in "af_packet: when sending ethernet
> frames, parse header for skb->protocol"
> 
> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/?id=0f75b09c798ed00c30d7d5551b896be883bc2aeb
> 
> I have double checked, the VM gets an IP address w/o this patch and it
> does not get an address with this patch.
> 
> Let me know if you need any information to investigate this issue.

Thanks for your investigation. I could reproduce your problem, the
culprit was the skb->data pointer changed as a side effect in
eth_type_trans().

Best wishes, Phil
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