static struct fb_info *get_fb_info(unsigned int idx)
{
	struct fb_info *fb_info;

	if (idx >= FB_MAX)
		return ERR_PTR(-ENODEV);

	mutex_lock(&registration_lock);
	fb_info = registered_fb[idx];
	if (fb_info)
		atomic_inc(&fb_info->count);
	mutex_unlock(&registration_lock);

	return fb_info;
}

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