netdev - Re: Fw: [Bug 13339] New: rtable leak in ipv4/route.c

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Message-ID: <20090519123417.GA7376@ff.dom.local>
Date:	Tue, 19 May 2009 12:34:17 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	lav@....ru
Cc:	Stephen Hemminger <shemminger@...ux-foundation.org>,
	netdev@...r.kernel.org, Neil Horman <nhorman@...driver.com>
Subject: Re: Fw: [Bug 13339] New: rtable leak in ipv4/route.c

On 19-05-2009 04:35, Stephen Hemminger wrote:
> 
> Begin forwarded message:
> 
> Date: Mon, 18 May 2009 14:10:20 GMT
> From: bugzilla-daemon@...zilla.kernel.org
> To: shemminger@...ux-foundation.org
> Subject: [Bug 13339] New: rtable leak in ipv4/route.c
> 
> 
> http://bugzilla.kernel.org/show_bug.cgi?id=13339
...
> 2.6.29 patch has introduced flexible route cache rebuilding. Unfortunately the
> patch has at least one critical flaw, and another problem.
> 
> rt_intern_hash calculates rthi pointer, which is later used for new entry
> insertion. The same loop calculates cand pointer which is used to clean the
> list. If the pointers are the same, rtable leak occurs, as first the cand is
> removed then the new entry is appended to it.
> 
> This leak leads to unregister_netdevice problem (usage count > 0).
> 
> Another problem of the patch is that it tries to insert the entries in certain
> order, to facilitate counting of entries distinct by all but QoS parameters.
> Unfortunately, referencing an existing rtable entry moves it to list beginning,
> to speed up further lookups, so the carefully built order is destroyed.
> 
> For the first problem the simplest patch it to set rthi=0 when rthi==cand, but
> it will also destroy the ordering.

I think fixing this bug fast is more important than this
ordering or counting. Could you send your patch proposal?

Thanks,
Jarek P.

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