linux-kernel - Re: [PATCH] hda_hwdep: Fix possible buffer overflow

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Date:	Wed, 26 Oct 2011 15:20:42 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Alexander Stein <alexander.stein@...tec-electronic.com>
Cc:	Jaroslav Kysela <perex@...ex.cz>, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hda_hwdep: Fix possible buffer overflow

At Wed, 26 Oct 2011 15:15:24 +0200,
Alexander Stein wrote:
> 
> Hello,
> 
> On Wednesday 26 October 2011 14:58:43 Takashi Iwai wrote:
> > At Wed, 26 Oct 2011 09:48:12 +0200,
> > 
> > Alexander Stein wrote:
> > > If a line in the firmware file is larger than the given buffer size (and
> > > so the firmware file size), size is set to a value larger than the actual
> > > buffer size. This results in an overflow in the buffer passed.
> > > Fix this by copying only up to 127 chars per line.
> > 
> > Actually this check should have been
> > 
> > 	if (size > fw->size)
> > 		size = fw->size;
> > 
> > Otherwise it doesn't make sense.
> > If the change is OK, could you resend the patch with it?
> 
> IMO this check isn't even needed. This case should be catched by this check
> 
>    for (len = 0; len < fw->size; len++) {
> 
> already.
> Opinions?

Right, it's superfluous.  Let's get rid of it.


Takashi
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