linux-kernel - Re: [PATCH] staging: line6: fix possible overrun

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Message-ID: <20140426204704.GB17562@mguzik.redhat.com>
Date:	Sat, 26 Apr 2014 22:47:05 +0200
From:	Mateusz Guzik <mguzik@...hat.com>
To:	Laurent Navet <laurent.navet@...il.com>
Cc:	gregkh@...uxfoundation.org, tiwai@...e.de,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: line6: fix possible overrun

On Sat, Apr 26, 2014 at 07:09:22PM +0200, Laurent Navet wrote:
> The strcpy operation may write past the end of the fixed-size destination
> buffer if the source buffer is too large.
> 
> Found by coverity scan : CID 144979
> 
> Signed-off-by: Laurent Navet <laurent.navet@...il.com>
> ---
> build tested only
> 
>  drivers/staging/line6/audio.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/line6/audio.c b/drivers/staging/line6/audio.c
> index 171d80c..65f5cd4 100644
> --- a/drivers/staging/line6/audio.c
> +++ b/drivers/staging/line6/audio.c
> @@ -32,9 +32,10 @@ int line6_init_audio(struct usb_line6 *line6)
>  
>  	line6->card = card;
>  
> -	strcpy(card->id, line6->properties->id);
> +	strncpy(card->id, line6->properties->id, (sizeof(card->id)-1));
>  	strcpy(card->driver, DRIVER_NAME);
> -	strcpy(card->shortname, line6->properties->name);
> +	strncpy(card->shortname, line6->properties->name,
> +			(sizeof(card->shortname)-1));
>  	/* longname is 80 chars - see asound.h */
>  	sprintf(card->longname, "Line6 %s at USB %s", line6->properties->name,
>  		dev_name(line6->ifcdev));

Would not it be better to return -EINVAL (or some other error) instead?

Now you will possibly truncate the name.

-- 
Mateusz Guzik
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