linux-kernel - Re: [PATCH -rc7 1/1] netpoll: Fix a leak-n-bug in netpoll

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Message-Id: <20070709.152252.13771404.davem@davemloft.net>
Date:	Mon, 09 Jul 2007 15:22:52 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	ssatyam@....iitk.ac.in
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH -rc7 1/1] netpoll: Fix a leak-n-bug in netpoll_cleanup()

From: Satyam Sharma <ssatyam@....iitk.ac.in>
Date: Wed, 04 Jul 2007 16:36:41 +0530

> From: Satyam Sharma <ssatyam@....iitk.ac.in>
> 
> [1/1] netpoll: Fix a leak-n-bug in netpoll_cleanup()
> 
> 93ec2c723e3f8a216dde2899aeb85c648672bc6b applied excessive duct tape to
> the netpoll beast's netpoll_cleanup(), thus substituting one leak with
> another, and opening up a little buglet :-)
> 
> net_device->npinfo (netpoll_info) is a shared and refcounted object and
> cannot simply be set NULL the first time netpoll_cleanup() is called.
> Otherwise, further netpoll_cleanup()'s see np->dev->npinfo == NULL and
> become no-ops, thus leaking. And it's a bug too: the first call to
> netpoll_cleanup() would thus (annoyingly) "disable" other (still alive)
> netpolls too. Maybe nobody noticed this because netconsole (only user
> of netpoll) never supported multiple netpoll objects earlier.
> 
> This is a trivial and obvious one-line fixlet.
> 
> Signed-off-by: Satyam Sharma <ssatyam@....iitk.ac.in>

Applied to net-2.6.23, I'll forward this on to -stable too.

Thanks.
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