int fb_get_color_depth(struct fb_var_screeninfo *var,
		       struct fb_fix_screeninfo *fix)
{
	int depth = 0;

	if (fix->visual == FB_VISUAL_MONO01 ||
	    fix->visual == FB_VISUAL_MONO10)
		depth = 1;
	else {
		if (var->green.length == var->blue.length &&
		    var->green.length == var->red.length &&
		    var->green.offset == var->blue.offset &&
		    var->green.offset == var->red.offset)
			depth = var->green.length;
		else
			depth = var->green.length + var->red.length +
				var->blue.length;
	}

	return depth;
}

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