linux-kernel - Re: [PATCH][RFC] Sound, Xonar, CS43xx: Don't overrun static array

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Date:	Sat, 22 Jan 2011 17:24:52 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Jesper Juhl <jj@...osbits.net>
Cc:	linux-kernel@...r.kernel.org, alsa-devel@...a-project.org,
	Jaroslav Kysela <perex@...ex.cz>,
	Clemens Ladisch <clemens@...isch.de>
Subject: Re: [PATCH][RFC] Sound, Xonar, CS43xx: Don't overrun static array

At Thu, 20 Jan 2011 22:37:43 +0100 (CET),
Jesper Juhl wrote:
> 
> 
> 'cs4398_regs' in 'struct xonar_cs43xx' is an array of 'u8' with a size of 
> 8. So, this code in sound/pci/oxygen/xonar_cs43xx.c::dump_d1_registers()
> 
>     		for (i = 2; i <= 8; ++i)
> 	  			snd_iprintf(buffer, " %02x", data->cs4398_regs[i]);
> 
> will overrun the array when 'i == 8'.
> 
> I guess that what's needed to fix it is the trivial patch below, but I 
> must admit that I have no idea about this code, so I may very well be 
> wrong. Additionally, I have no way to actually test this, so all I know is 
> that the below compiles. Someone who actually knows this code should take 
> a look before anything is comitted - consider the below (not much more 
> than) a bug report.
> 
> Signed-off-by: Jesper Juhl <jj@...osbits.net>

Applied now.  Thanks.


Takashi

> ---
>  xonar_cs43xx.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/sound/pci/oxygen/xonar_cs43xx.c b/sound/pci/oxygen/xonar_cs43xx.c
> index 9f72d42..2527191 100644
> --- a/sound/pci/oxygen/xonar_cs43xx.c
> +++ b/sound/pci/oxygen/xonar_cs43xx.c
> @@ -392,7 +392,7 @@ static void dump_d1_registers(struct oxygen *chip,
>  	unsigned int i;
>  
>  	snd_iprintf(buffer, "\nCS4398: 7?");
> -	for (i = 2; i <= 8; ++i)
> +	for (i = 2; i < 8; ++i)
>  		snd_iprintf(buffer, " %02x", data->cs4398_regs[i]);
>  	snd_iprintf(buffer, "\n");
>  	dump_cs4362a_registers(data, buffer);
> 
> -- 
> Jesper Juhl <jj@...osbits.net>            http://www.chaosbits.net/
> Don't top-post http://www.catb.org/~esr/jargon/html/T/top-post.html
> Plain text mails only, please.
> 
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