Hello,

In linux 3.10 in the file drivers/tty/tty_port.c the function
tty_port_tty_hangup may leak a tty reference:

        struct tty_struct *tty = tty_port_tty_get(port);

        if (tty && (!check_clocal || !C_CLOCAL(tty))) {
                tty_hangup(tty);
                tty_kref_put(tty);
        }

If tty != NULL and the second condition is false we never call tty_kref_put and
the reference is leaked.

Fix by nesting two if statements.

Signed-off-by: Gianluca Anzolin <gianluca@sottospazio.it>