linux-kernel - Re: [PATCH net] ipv6: Don't call with rt6_uncached_list_flush

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Date:	Tue, 13 Oct 2015 04:53:23 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	ebiederm@...ssion.com
Cc:	dvyukov@...gle.com, kafai@...com, kuznet@....inr.ac.ru,
	jmorris@...ei.org, yoshfuji@...ux-ipv6.org, kaber@...sh.net,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	syzkaller@...glegroups.com, kcc@...gle.com, glider@...gle.com,
	andreyknvl@...gle.com, sasha.levin@...cle.com, edumazet@...gle.com,
	maze@...gle.com, eric.dumazet@...il.com
Subject: Re: [PATCH net] ipv6: Don't call with rt6_uncached_list_flush_dev

From: ebiederm@...ssion.com (Eric W. Biederman)
Date: Mon, 12 Oct 2015 11:02:08 -0500

> 
> As originally written rt6_uncached_list_flush_dev makes no sense when
> called with dev == NULL as it attempts to flush all uncached routes
> regardless of network namespace when dev == NULL.  Which is simply
> incorrect behavior.
> 
> Furthermore at the point rt6_ifdown is called with dev == NULL no more
> network devices exist in the network namespace so even if the code in
> rt6_uncached_list_flush_dev were to attempt something sensible it
> would be meaningless.
> 
> Therefore remove support in rt6_uncached_list_flush_dev for handling
> network devices where dev == NULL, and only call rt6_uncached_list_flush_dev
>  when rt6_ifdown is called with a network device.
> 
> Fixes: 8d0b94afdca8 ("ipv6: Keep track of DST_NOCACHE routes in case of iface down/unregister")
> Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>

Applied and queued up for -stable, thanks.
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