linux-kernel - Re: [PATCH 0/2] fbdev: add fillrect and copyarea ioctls

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Date:	Tue, 14 Jul 2009 00:38:04 +0430
From:	Ali Gholami Rudi <ali@...i.ir>
To:	Greg KH <gregkh@...e.de>
Cc:	fbdev <linux-fbdev-devel@...ts.sourceforge.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Righi <righi.andrea@...il.com>,
	Krzysztof Helt <krzysztof.h1@...pl>,
	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>,
	Philippe De Muyter <phdm@...qel.be>,
	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] fbdev: add fillrect and copyarea ioctls

Greg KH <gregkh@...e.de> wrote:
> On Mon, Jul 13, 2009 at 07:47:09PM +0430, Ali Gholami Rudi wrote:
> > Is there any reason for not adding these ioctls to fbdev?  I searched
> > the net and couldn't any.  Anyway, these patches simply implement those
> > ioctls.
> 
> Have you also added the needed 32 vs. 64 bit handlers for these ioctls?

I guess Arnd's patch will do.

By the way, it should check for overflows, too?  I mean should I change
this:

> +       if (copy->dx + copy->width > info->var.xres ||
> +           copy->sx + copy->width > info->var.xres ||
> +           copy->dy + copy->height > info->var.yres ||
> +           copy->sy + copy->height > info->var.yres) {

#define ISSUMLESSTHAN(a, b, s)	(((a) <= (s)) && ((b) <= (s)) && \
				 ((a) + (b) <= (s)))

if (!ISSUMLESSTHAN(copy->dx, copy->width, info->var.xres) || ...

	Ali
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