netdev - Re: [PATCH] ax25: Fix ax25_cb refcounting in ax25_ctl

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Date:	Sun, 27 Sep 2009 08:23:19 +0100
From:	Ralf Baechle DL5RB <ralf@...ux-mips.org>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	Bernard Pidoux F6BVP <f6bvp@...e.fr>,
	Bernard Pidoux <bernard.pidoux@...c.fr>,
	Linux Netdev List <netdev@...r.kernel.org>,
	linux-hams <linux-hams@...r.kernel.org>
Subject: Re: [PATCH] ax25: Fix ax25_cb refcounting in ax25_ctl_ioctl

On Fri, Sep 25, 2009 at 08:35:04PM +0200, Jarek Poplawski wrote:

> > > This bug isn't responsible for these oopses here, but looks quite
> > > obviously. (I'm not sure if it's easy to test/hit with the common
> > > tools.)
> > 
> > The issue your patch fixes is obvious enough.
> 
> Yes, with new code there would be no doubt. But here, if you know it's
> worked for some time, you wonder if you're not blind. |-)

Most of of the ioctls are used by AX.25 userland which does error
checking on user supplied values so userland will never attempt invalid
ioctl calls.  So no surprise this went unnoticed.

  Ralf
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