linux-kernel - Re: [PATCH] net: cgroup: fix out of bounds accesses

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Message-ID: <20120709121350.GC9186@hmsreliant.think-freely.org>
Date:	Mon, 9 Jul 2012 08:13:50 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, lizefan@...wei.com, tj@...nel.org,
	Gao feng <gaofeng@...fujitsu.com>
Subject: Re: [PATCH] net: cgroup: fix out of bounds accesses

On Mon, Jul 09, 2012 at 01:50:52PM +0200, Eric Dumazet wrote:
> On Mon, 2012-07-09 at 07:01 -0400, Neil Horman wrote:
> 
> > Thank you for doing this Eric, Gao.  Just to be sure (I asked in the previous
> > thread), would it be better to avoid the length check in skb_update_prio, and
> > instead update the netdev tables to be long enough in cgrp_create and in
> > netprio_device_event on device registration?
> 
> Yes probably, and it is even needed because extend_netdev_table() can
> acutally fail to expand the table if kzalloc() returned NULL.
> 
> Current code just ignores this allocation failure so we also can crash
> in write_priomap()
> 
ACK, can you follow up with a patch please?

Thanks!
Neil

> 
> 
> 
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