linux-kernel - Re: [PATCH] SOUND: usb/endpoint, fix dangling pointer use

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Date:	Mon, 21 Jun 2010 17:09:03 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Daniel Mack <daniel@...aq.de>
Cc:	Jiri Slaby <jslaby@...e.cz>, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org, jirislaby@...il.com,
	Clemens Ladisch <clemens@...isch.de>
Subject: Re: [PATCH] SOUND: usb/endpoint, fix dangling pointer use

At Mon, 21 Jun 2010 17:05:16 +0200,
Daniel Mack wrote:
> 
> On Mon, Jun 21, 2010 at 05:03:21PM +0200, Jiri Slaby wrote:
> > Stanse found that in snd_usb_parse_audio_endpoints, there is a
> > dangling pointer dereference. When snd_usb_parse_audio_format fails,
> > fp is freed, and continue invoked. On the next loop, there is
> > "fp && fp->altsetting == 1 && fp->channels == 1" test, but fp is set
> > from the last iteration (but is bogus) and thus ilegally dereferenced.
> > 
> > Set fp to NULL before "continue".
> 
> Oh, absolutely. Thanks.
> 
> > Signed-off-by: Jiri Slaby <jslaby@...e.cz>
> 
> Acked-by: Daniel Mack <daniel@...aq.de>
> 
> I think this should go thru the ALSA tree.

Yep, I applied it now.  Thanks!


Takashi
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