]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commitdiff
tty_port: Fix refcounting leak in tty_port_tty_hangup()
authorGianluca Anzolin <gianluca@sottospazio.it>
Thu, 25 Jul 2013 05:26:16 +0000 (07:26 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 26 Jul 2013 23:34:00 +0000 (16:34 -0700)
The function tty_port_tty_hangup() could leak a reference to the tty_struct:

        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 always calling tty_kref_put() which accepts a NULL argument.

The patch fixes a regression introduced by commit aa27a094.

Acked-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: Gianluca Anzolin <gianluca@sottospazio.it>
Acked-by: Jiri Slaby <jslaby@suse.cz>
Cc: stable <stable@vger.kernel.org> # 3.10
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/tty/tty_port.c

index 121aeb9393e1172e75fe5972a7c4b8ab4640557f..f597e88a705d1fa8e65cf36ae98a61f84f20b9a3 100644 (file)
@@ -256,10 +256,9 @@ void tty_port_tty_hangup(struct tty_port *port, bool check_clocal)
 {
        struct tty_struct *tty = tty_port_tty_get(port);
 
-       if (tty && (!check_clocal || !C_CLOCAL(tty))) {
+       if (tty && (!check_clocal || !C_CLOCAL(tty)))
                tty_hangup(tty);
-               tty_kref_put(tty);
-       }
+       tty_kref_put(tty);
 }
 EXPORT_SYMBOL_GPL(tty_port_tty_hangup);