netdev - Re: PROBLEM: System call 'sendmsg' of process ospfd (quagga) causes kernel oops

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Message-Id: <20111019.040240.758852119107748001.davem@davemloft.net>
Date:	Wed, 19 Oct 2011 04:02:40 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	herbert@...dor.hengli.com.au, evonlanthen@...il.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	timo.teras@....fi
Subject: Re: PROBLEM: System call 'sendmsg' of process ospfd (quagga)
 causes kernel oops

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 19 Oct 2011 09:52:19 +0200

> For GRE tunnels, I dont think IPv6 fragmentation could be relevant,
> but maybe IGMP could trigger a problem ?

Funny... icmpv6 uses ip6_append_data() which uses hh_len in a
local variable, which seems to suggest that it's immune to
this problem.

IPV4 side seems identical in this regard.

So, as far as I can see, my patch is sufficient to cover IP_GRE
reasonably in the 'net' tree.

Agreed?

If so, someone please test this thing :-)
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