linux-kernel - Re: [PATCH] staging: fbtft: fix out of bound access

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Date:	Thu, 4 Jun 2015 15:36:31 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Noralf Trønnes <noralf@...nnes.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: fbtft: fix out of bound access

On Thu, Jun 04, 2015 at 05:12:01PM +0530, Sudip Mukherjee wrote:
> size of str is 16, but in snprintf the size was mentioned as 128.
> 
> Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
> ---
>  drivers/staging/fbtft/fbtft-core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/fbtft/fbtft-core.c b/drivers/staging/fbtft/fbtft-core.c
> index ce64521..0af84b5 100644
> --- a/drivers/staging/fbtft/fbtft-core.c
> +++ b/drivers/staging/fbtft/fbtft-core.c
> @@ -1096,7 +1096,7 @@ static int fbtft_init_display_dt(struct fbtft_par *par)
>  			/* make debug message */
>  			msg[0] = '\0';
>  			for (j = 0; j < i; j++) {
> -				snprintf(str, 128, " %02X", buf[j]);
> +				snprintf(str, 16, " %02X", buf[j]);

Good eye.  How did you find this?

The good news is buf[j] is <= 0xFFFF so it won't actually overflow.  Who
knows why it is zero padded 2 spaces...  But use sizeof(str) instead of
16.

regards,
dan carpenter

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