linux-kernel - Re: [patch 2/2] fbcmap: integer overflow bug

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Message-ID: <20101115081457.GC21614@bicker>
Date:	Mon, 15 Nov 2010 11:14:57 +0300
From:	Dan Carpenter <error27@...il.com>
To:	walter harms <wharms@....de>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [patch 2/2] fbcmap: integer overflow bug

On Mon, Nov 15, 2010 at 09:01:14AM +0100, walter harms wrote:
> I do not see the rest of the code but it looks like
> cmap->len is size in int8_t. So the upper limit is something like
> INT_MAX/(sizeof(u16)*2). Perhaps we can call it a char ?
> is there ANY system that has a more than 256 colors in R|G|B ?
> 

Yeah.  There are.  I had a list of some but I've deleted it.

> <spying for struct fb_cmap_user  >
>  __u32 len;
>  __u16 __user *red;
> 
> So no need to check for <0.

I test size which is an int so that's why it's needed.

regards,
dan carpenter

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