static void uvesafb_check_limits(struct fb_var_screeninfo *var,
		struct fb_info *info)
{
	const struct fb_videomode *mode;
	struct uvesafb_par *par = info->par;

	/*
	 * If pixclock is set to 0, then we're using default BIOS timings
	 * and thus don't have to perform any checks here.
	 */
	if (!var->pixclock)
		return;

	if (par->vbe_ib.vbe_version < 0x0300) {
		fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, var, info);
		return;
	}

	if (!fb_validate_mode(var, info))
		return;

	mode = fb_find_best_mode(var, &info->modelist);
	if (mode) {
		if (mode->xres == var->xres && mode->yres == var->yres &&
		    !(mode->vmode & (FB_VMODE_INTERLACED | FB_VMODE_DOUBLE))) {
			fb_videomode_to_var(var, mode);
			return;
		}
	}

	if (info->monspecs.gtf && !fb_get_mode(FB_MAXTIMINGS, 0, var, info))
		return;
	/* Use default refresh rate */
	var->pixclock = 0;
}

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.