linux-kernel - Re: NULL pointer dereference in mainline and next

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Message-ID: <20111129100442.GB26310@mudshark.cambridge.arm.com>
Date:	Tue, 29 Nov 2011 10:04:42 +0000
From:	Will Deacon <will.deacon@....com>
To:	David Miller <davem@...emloft.net>
Cc:	"eric.dumazet@...il.com" <eric.dumazet@...il.com>,
	"mmaruseac@...acom.com" <mmaruseac@...acom.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: NULL pointer dereference in mainline and next

On Mon, Nov 28, 2011 at 10:08:40PM +0000, David Miller wrote:
> From: Will Deacon <will.deacon@....com>
> Date: Mon, 28 Nov 2011 14:35:58 +0000
> 
> > On Mon, Nov 28, 2011 at 02:33:24PM +0000, Eric Dumazet wrote:
> >> Le lundi 28 novembre 2011 à 14:18 +0000, Will Deacon a écrit :
> >> > Hello,
> >> > 
> >> > Commit f04565dd ("dev: use name hash for dev_seq_ops") requires a struct
> >> > dev_iter_state to be allocated for the seq_file->private member, as that is
> >> > used to implement the name hash.
> >> > 
> >> > Unfortunately, the dev_mcast code wasn't updated and so only allocates space
> >> > for a seq_net_private, leading to the following NULL dereference (removed
> >> > static inline annotations to get sane backtrace):
> > 
> > [...]
> > 
> >> Anton Blanchard already provided a fix for this problem.
> >> 
> >> http://patchwork.ozlabs.org/patch/127931/
> > 
> > Ok, great - as long as it gets fixed!
> 
> Please in the future report networking bugs to netdev@...r.kernel.org as that
> will reach the largest number of networking developers.

Sure, I just stumbled across this testing some ARM stuff, but I'll bear that
in mind in future.

Cheers,

Will
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