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Date:	Sun, 01 Mar 2015 00:30:00 -0500 (EST)
From:	David Miller <>
Subject: Re: [PATCH net] macvtap: make sure neighbour code can push
 ethernet header

From: Eric Dumazet <>
Date: Fri, 27 Feb 2015 18:35:35 -0800

> From: Eric Dumazet <>
> Brian reported crashes using IPv6 traffic with macvtap/veth combo.
> I tracked the crashes in neigh_hh_output()
> -> memcpy(skb->data - HH_DATA_MOD, hh->hh_data, HH_DATA_MOD);
> Neighbour code assumes headroom to push Ethernet header is
> at least 16 bytes.
> It appears macvtap has only 14 bytes available on arches
> where NET_IP_ALIGN is 0 (like x86)
> Effect is a corruption of 2 bytes right before skb->head,
> and possible crashes if accessing non existing memory.
> This fix should also increase IPv4 performance, as paranoid code
> in ip_finish_output2() wont have to call skb_realloc_headroom()
> Reported-by: Brian Rak <>
> Tested-by: Brian Rak <>
> Signed-off-by: Eric Dumazet <>

Applied and queued up for -stable, thanks.
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