linux-kernel - Re: [PATCH] sound, hda_eld: suspicious sizeof() in call to snd_print_pcm

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Date:	Sat, 29 Jan 2011 12:01:55 +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>,
	Wu Fengguang <wfg@...ux.intel.com>
Subject: Re: [PATCH] sound, hda_eld: suspicious sizeof() in call to snd_print_pcm_bits()

At Sat, 29 Jan 2011 01:40:04 +0100 (CET),
Jesper Juhl wrote:
> 
> In hdmi_show_short_audio_desc() we call snd_print_pcm_bits() like this:
>   snd_print_pcm_bits(a->sample_bits, buf2 + 8, sizeof(buf2 - 8));
> that last argument is supposed to be the size of the buffer that 
> snd_print_pcm_bits() writes to, so I believe it should be this:
>   snd_print_pcm_bits(a->sample_bits, buf2 + 8, sizeof(buf2) - 8);
> 
> Signed-off-by: Jesper Juhl <jj@...osbits.net>

Thanks, but this was already fixed in sound git tree and included in
the pending pull request for 2.6.38.


Takashi

> ---
>  hda_eld.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
>  Compile tested only. I don't have relevant hardware.
> 
> diff --git a/sound/pci/hda/hda_eld.c b/sound/pci/hda/hda_eld.c
> index 4a66347..74b0560 100644
> --- a/sound/pci/hda/hda_eld.c
> +++ b/sound/pci/hda/hda_eld.c
> @@ -381,7 +381,7 @@ static void hdmi_show_short_audio_desc(struct cea_sad *a)
>  	snd_print_pcm_rates(a->rates, buf, sizeof(buf));
>  
>  	if (a->format == AUDIO_CODING_TYPE_LPCM)
> -		snd_print_pcm_bits(a->sample_bits, buf2 + 8, sizeof(buf2 - 8));
> +		snd_print_pcm_bits(a->sample_bits, buf2 + 8, sizeof(buf2) - 8);
>  	else if (a->max_bitrate)
>  		snprintf(buf2, sizeof(buf2),
>  				", max bitrate = %d", a->max_bitrate);
> 
> 
> -- 
> 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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