linux-kernel - Re: [ 044/184] ALSA: ice1712: Initialize card->private

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Message-ID: <20130607053401.GE14633@1wt.eu>
Date:	Fri, 7 Jun 2013 07:34:01 +0200
From:	Willy Tarreau <w@....eu>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Sean Connor <sconnor004@...yinics.org>,
	Takashi Iwai <tiwai@...e.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [ 044/184] ALSA: ice1712: Initialize card->private_data

Hi Ben,

On Fri, Jun 07, 2013 at 04:48:58AM +0100, Ben Hutchings wrote:
> > From: Sean Connor <sconnor004@...yinics.org>
> > 
> > commit 69a4cfdd444d1fe5c24d29b3a063964ac165d2cd upstream.
> > 
> > Set card->private_data in snd_ice1712_create for fixing NULL
> > dereference in snd_ice1712_remove().
> 
> This bug appears to have been introduced in Linux 3.8 and doesn't need
> fixing in 2.6.32.

Ah indeed that's true. Does it harm to have it or not ? because I'm
still seeing a number of places where we have this in the driver :

   struct snd_ice1712 *ice = ac97->private_data;

I'd like to be sure that no other function risks to dereference the
same pointer. Also, I'm noting that 3.0/3.4 have this fix, while 3.2
does not. So I'm hesitant what to do with this patch.

Thanks,
Willy

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