netdev - Re: [PATCH net-next v2] ipv6: enable anycast addresses as source addresses in ICMPv6 error messages

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Date:	Thu, 06 Feb 2014 10:37:07 +0100
From:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:	Francois-Xavier Le Bail <fx.lebail@...oo.com>,
	netdev@...r.kernel.org
CC:	David Stevens <dlstevens@...ibm.com>,
	Bill Fink <billfink@...dspring.com>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki Yoshifuji <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH net-next v2] ipv6: enable anycast addresses as source
 addresses in ICMPv6 error messages

Le 19/01/2014 17:00, Francois-Xavier Le Bail a écrit :
> - Uses ipv6_anycast_destination() in icmp6_send().
>
> Suggested-by: Bill Fink <billfink@...dspring.com>
> Signed-off-by: Francois-Xavier Le Bail <fx.lebail@...oo.com>
This patch causes an Oops on my target.

Here is the step to reproduce it:
modprobe sit
ip link add sit1 type sit remote 10.16.0.121 local 10.16.0.249
ip l s sit1 up
ip -6 a a dev sit1 2001:1234::123 remote 2001:1234::121
ping6 2001:1234::121

The problem is that ipv6_anycast_destination() uses unconditionally
skb_dst(skb), which is NULL in this case.

Not sure what is the best way to fix this, any suggestions?


Regards,
Nicolas
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