netdev - Re: oops in udpv6

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Message-ID: <20130626130748.GC20081@order.stressinduktion.org>
Date:	Wed, 26 Jun 2013 15:07:48 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Dave Jones <davej@...hat.com>, David Miller <davem@...emloft.net>,
	netdev@...r.kernel.org,
	Steffen Klassert <steffen.klassert@...unet.com>
Subject: Re: oops in udpv6_sendmsg

On Wed, Jun 26, 2013 at 04:15:07AM -0700, Eric Dumazet wrote:
> Following patch fixes the problem for me :

Cool, thanks Eric!

> [PATCH] ipv6: ip6_sk_dst_check() must not assume ipv6 dst
> 
> It's possible to use AF_INET6 sockets and to connect to an IPv4
> destination. After this, socket dst cache is a pointer to a rtable,
> not rt6_info.

That was my hunch, too. I was unsure where we should destroy the lingering dst.

> ip6_sk_dst_check() should check the socket dst cache is IPv6, or else
> various corruptions/crashes can happen.
> 
> Dave Jones can reproduce immediate crash with 
> trinity -q -l off -n -c sendmsg -c connect
> 
> With help from Hannes Frederic Sowa
> 
> Reported-by: Dave Jones <davej@...hat.com>
> Reported-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Patch looks good. It also fixes some panics I have seen down lower in
the netfilter ipv6 code I saw while testing, which I thought may be a
different issue.

Acked-by: Hannes Frederic Sowa <hannes@...essinduktion.org>

Thanks,

  Hannes

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