SecurityController.php

<?php

namespace YourCompany\YourProject\UserBundle\Controller;

use Symfony\Component\HttpFoundation\RedirectResponse;
use Symfony\Component\HttpFoundation\Request;
use FOS\UserBundle\Controller\SecurityController as BaseController;

class SecurityController extends BaseController
{
    public function loginAction(Request $request)
    {
        $securityContext = $this->container->get('security.context');
        $router = $this->container->get('router');

        if ($securityContext->isGranted('IS_AUTHENTICATED_FULLY')) {
            return new RedirectResponse($router->generate('fos_user_profile_show'), 307);
        }

        return parent::loginAction($request);
    }
}