netdev - Re: new leaks in bridging code.

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Date:	Mon, 31 Mar 2014 12:54:06 +0900
From:	Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
To:	Dave Jones <davej@...hat.com>,
	Toshiaki Makita <toshiaki.makita1@...il.com>
CC:	netdev@...r.kernel.org
Subject: Re: new leaks in bridging code.

(2014/03/30 11:47), Dave Jones wrote:
> On Sun, Mar 30, 2014 at 11:28:21AM +0900, Toshiaki Makita wrote:
>  > On Sat, 2014-03-29 at 17:01 -0400, Dave Jones wrote:
>  > > yesterdays bridging changes introduced leaks in the exit paths..
>  > > 
>  > The patch has nothing to do with this memory leak.
> 
> Good point, the checker only picked up it as 'new' because of the
> additional call to vlan_untag.
> 
>  > It has existed since br_allowed_ingress was introduced.
>  > I'm working on fixing it.
>  > http://marc.info/?t=139598775400004&r=1&w=2
> 
> Great! (I'm behind on email so hadn't seen this thread).
> 

Considering more deeply about why your checker claimed that vlan_untag()
in br_allowed_ingress() is bad, I got an idea that it should have
pointed out not resource leakage but double free of skb.

vlan_untag() may free skbs, but we also free skbs in caller side
(br_handle_frame_finish()) without updating skb pointers to NULL.

I'll also fix this problem.

Thanks,
Toshiaki Makita
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