netdev - Re: oops in udpv6

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Date:	Wed, 26 Jun 2013 02:29:56 -0700
From:	Eric Dumazet <erdnetdev@...il.com>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
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, 2013-06-26 at 02:22 -0700, Eric Dumazet wrote:
> ip6_rt_put
> 
> Oh well...
> 
> It sounds we mix ipv4/ipv6 dst on an IPV6 socket.
> 
> So an IPV4 actor thinks he got a "struct rtable" pointer and messes
> critical fields which overlay struct rt6_info components, for example
> rt6i_node
> 
> rt6_inode  shares the same storage with : 
> 
> rt_type/rt_is_input/rt_uses_gateway/rt_iif
> 
> In my case, rt_iif is 0
> 
> CC Steffen Klassert, because of commit
> 8141ed9fcedb278f4a3a78680591bef1e55f75fb
> ("ipv4: Add a socket release callback for datagram sockets")

ip6_sk_dst_lookup_flow()/ip6_sk_dst_check() look buggy, they assume the
socket dst is an IPv6 one.

But its not true if ip4_datagram_connect() was called before.



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