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

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Message-ID: <1341834652.3265.2642.camel@edumazet-glaptop>
Date:	Mon, 09 Jul 2012 13:50:52 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Neil Horman <nhorman@...driver.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, 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()



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