fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
{
	struct fb_fix_screeninfo *fix = &info->fix;
	unsigned int yres = info->var.yres;
	int err = 0;

	if (var->yoffset > 0) {
		if (var->vmode & FB_VMODE_YWRAP) {
			if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep))
				err = -EINVAL;
			else
				yres = 0;
		} else if (!fix->ypanstep || (var->yoffset % fix->ypanstep))
			err = -EINVAL;
	}

	if (var->xoffset > 0 && (!fix->xpanstep ||
				 (var->xoffset % fix->xpanstep)))
		err = -EINVAL;

	if (err || !info->fbops->fb_pan_display ||
	    var->yoffset > info->var.yres_virtual - yres ||
	    var->xoffset > info->var.xres_virtual - info->var.xres)
		return -EINVAL;

	if ((err = info->fbops->fb_pan_display(var, info)))
		return err;
	info->var.xoffset = var->xoffset;
	info->var.yoffset = var->yoffset;
	if (var->vmode & FB_VMODE_YWRAP)
		info->var.vmode |= FB_VMODE_YWRAP;
	else
		info->var.vmode &= ~FB_VMODE_YWRAP;
	return 0;
}

This weakness involves numeric computation errors, such as integer overflows, underflows, or precision losses, which can lead to miscalculations and exploitable behaviors in software.