Re: [patch 2/2] fbcmap: integer overflow bug

[Dan Carpenter]

On Mon, Nov 15, 2010 at 07:56:05AM +0100, Geert Uytterhoeven wrote:
> On Mon, Nov 15, 2010 at 05:48, Paul Mundt <lethal@xxxxxxxxxxxx> wrote:
> > On Sat, Nov 13, 2010 at 01:07:18PM +0300, Dan Carpenter wrote:
> >> @@ -256,8 +264,12 @@ int fb_set_user_cmap(struct fb_cmap_user *cmap, struct fb_info *info)
> >>       int rc, size = cmap->len * sizeof(u16);
> >>       struct fb_cmap umap;
> >>
> >> +     if (cmap->len * 2 > INT_MAX)
> 
> Isn't that another integer overflow? I.e. should be "if (cmap->len >
> INT_MAX / sizeof(u16))" instead?
> 

Yeah it is.  :/

I'll change it to:
	if (size < 0 || size < cmap->len)
like Paul asked.

regards,
dan carpenter

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/