Re: [Linux-fbdev-devel] [PATCH] omapfb: invalid test on unsigned

[Krzysztof H. <krz...@po...>]

On Mon, 22 Jun 2009 22:35:59 +0200
Roel Kluin <roe...@gm...> wrote:

> Unsigned regno cannot be less than 0.
> 
> Signed-off-by: Roel Kluin <roe...@gm...>
> ---
> Is this correct? please review.
> 

No. It is a case for truecolor modes. They do not use the cmap. 
Either remove the if clause completely or make it a an else clause for the next if

if (regno < 16) {
...
} else {
    r = -EINVAL;
}


The latter (the else clause) is a better solution.

Kind regards,
Krzysztof

> diff --git a/drivers/video/omap/omapfb_main.c b/drivers/video/omap/omapfb_main.c
> index 060d72f..787271f 100644
> --- a/drivers/video/omap/omapfb_main.c
> +++ b/drivers/video/omap/omapfb_main.c
> @@ -276,7 +276,7 @@ static int _setcolreg(struct fb_info *info, u_int regno, u_int red, u_int green,
>  		if (r != 0)
>  			break;
>  
> -		if (regno < 0) {
> +		if (regno >= info->cmap.len) {
>  			r = -EINVAL;
>  			break;
>  		}
> 
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