Redirection loop
If a user try to access a page he isn't supposed to, he is redirected to the login page. Since he is already logged in, the redirection page redirect him to the previous page, resulting into a redirection loop.
If a user try to access a page he isn't supposed to, he is redirected to the login page. Since he is already logged in, the redirection page redirect him to the previous page, resulting into a redirection loop.