linux-kernel - Re: [patch] ALSA: isa/wavefront: prevent some out of bound writes

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Date:	Sun, 08 May 2016 11:39:56 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	"Dan Carpenter" <dan.carpenter@...cle.com>
Cc:	"Jaroslav Kysela" <perex@...ex.cz>, <alsa-devel@...a-project.org>,
	<kernel-janitors@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [patch] ALSA: isa/wavefront: prevent some out of bound writes

On Wed, 04 May 2016 08:27:37 +0200,
Dan Carpenter wrote:
> 
> "header->number" can be up to USHRT_MAX and it comes from the ioctl so
> it needs to be capped.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

Applied, thanks.


Takashi

> 
> diff --git a/sound/isa/wavefront/wavefront_synth.c b/sound/isa/wavefront/wavefront_synth.c
> index 69f76ff..718d5e3 100644
> --- a/sound/isa/wavefront/wavefront_synth.c
> +++ b/sound/isa/wavefront/wavefront_synth.c
> @@ -785,6 +785,9 @@ wavefront_send_patch (snd_wavefront_t *dev, wavefront_patch_info *header)
>  	DPRINT (WF_DEBUG_LOAD_PATCH, "downloading patch %d\n",
>  				      header->number);
>  
> +	if (header->number >= ARRAY_SIZE(dev->patch_status))
> +		return -EINVAL;
> +
>  	dev->patch_status[header->number] |= WF_SLOT_FILLED;
>  
>  	bptr = buf;
> @@ -809,6 +812,9 @@ wavefront_send_program (snd_wavefront_t *dev, wavefront_patch_info *header)
>  	DPRINT (WF_DEBUG_LOAD_PATCH, "downloading program %d\n",
>  		header->number);
>  
> +	if (header->number >= ARRAY_SIZE(dev->prog_status))
> +		return -EINVAL;
> +
>  	dev->prog_status[header->number] = WF_SLOT_USED;
>  
>  	/* XXX need to zero existing SLOT_USED bit for program_status[i]
> @@ -898,6 +904,9 @@ wavefront_send_sample (snd_wavefront_t *dev,
>  		header->number = x;
>  	}
>  
> +	if (header->number >= WF_MAX_SAMPLE)
> +		return -EINVAL;
> +
>  	if (header->size) {
>  
>  		/* XXX it's a debatable point whether or not RDONLY semantics
>