linux-kernel - Re: [PATCH v2] hda_hwdep: Fix possible buffer overflow

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Message-ID: <s5h1utsnsa5.wl%tiwai@suse.de>
Date:	Tue, 01 Nov 2011 09:47:14 +0100
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 v2] hda_hwdep: Fix possible buffer overflow

At Tue,  1 Nov 2011 09:40:07 +0100,
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.
> 
> Signed-off-by: Alexander Stein <alexander.stein@...tec-electronic.com>
> ---
> Changes in v2:
> * Just remove the erroneous check

Thanks, applied now.


Takashi

> 
>  sound/pci/hda/hda_hwdep.c |    2 --
>  1 files changed, 0 insertions(+), 2 deletions(-)
> 
> diff --git a/sound/pci/hda/hda_hwdep.c b/sound/pci/hda/hda_hwdep.c
> index 72e5885..7e7d078 100644
> --- a/sound/pci/hda/hda_hwdep.c
> +++ b/sound/pci/hda/hda_hwdep.c
> @@ -756,8 +756,6 @@ static int get_line_from_fw(char *buf, int size, struct firmware *fw)
>  	}
>  	if (!fw->size)
>  		return 0;
> -	if (size < fw->size)
> -		size = fw->size;
>  
>  	for (len = 0; len < fw->size; len++) {
>  		if (!*p)
> -- 
> 1.7.3.4
> 
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