netdev - Re: [RFC PATCH] net: cgroup: null ptr dereference in netprio cgroup during init

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Date:	Wed, 18 Jul 2012 12:37:21 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	David Miller <davem@...emloft.net>
Cc:	john.r.fastabend@...el.com, gaofeng@...fujitsu.com,
	mark.d.rustad@...el.com, netdev@...r.kernel.org,
	eric.dumazet@...il.com
Subject: Re: [RFC PATCH] net: cgroup: null ptr dereference in netprio cgroup
 during init

On Wed, Jul 18, 2012 at 08:53:03AM -0700, David Miller wrote:
> From: Neil Horman <nhorman@...driver.com>
> Date: Wed, 18 Jul 2012 11:25:20 -0400
> 
> > Yeah, I see what you mean.  Seems like what we need is to either:
> > 1) move cgroup_init to later in the boot process.  If you're not early_init,
> > then I don't see why the subsystem can't wait until later in the boot process
> > (i.e. make cgroup_init a late_initcall or some such).
> > 
> > or
> > 
> > 2) Allow module based cgroups to flag themselves as needing late init after the
> > rest of the kernel has booted.
> 
> These are way too complicated compared to John's currently proposed
> fix for this recently introduced regression.
> 
> I want a one liner which I can prove is going to remove the crash.
> 
> All of this talk of rearranging initcall ordering for cgroup stuff
> is too ambitious this late in the -rc.
> 
Thats a fair point. I'd still like to look into this further, as I think theres
a more correct answer than the current proposal.  But since we're looking to fix a
specific problem at the end of rc:
Acked-by: Neil Horman <nhorman@...driver.com>

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