Bug in wp-login.php page

[ramnew2006]

When a user tries to access the example.com/wp-login.php when he is already logged in, the present wp-login.php file redirects to the same login page asking for sign in details or leaves a blank page. A conditional statement which checks if the user is logged in or not should be present in the wp-login.php file like the following code.

/** If a user is logged in he should be redirected to the home page automatically. */  
if ( is_user_logged_in() ) {
  wp_redirect( home_url() ); 
  exit();
}

[SergeyBiryukov]

#14949, #20639

A blank page might be related to ticket:14787:7.