TTY: hso, free tty_driver

Do not leak tty_driver structure on each module removal. Also do
proper frees in fail paths of module_init.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Jan Dumon <j.dumon@option.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 8 insertions, 4 deletions

diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
index abe47ad59479..cdc589edeaf6 100644
--- a/drivers/net/usb/hso.c
+++ b/drivers/net/usb/hso.c
@@ -3332,7 +3332,7 @@ static int __init hso_init(void)
         if (result) {
                 printk(KERN_ERR "%s - tty_register_driver failed(%d)\n",
                         __func__, result);
-                return result;
+                goto err_free_tty;
         }
 
         /* register this module as an usb driver */
@@ -3340,13 +3340,16 @@ static int __init hso_init(void)
         if (result) {
                 printk(KERN_ERR "Could not register hso driver? error: %d\n",
                         result);
-                /* cleanup serial interface */
-                tty_unregister_driver(tty_drv);
-                return result;
+                goto err_unreg_tty;
         }
 
         /* done */
         return 0;
+err_unreg_tty:
+        tty_unregister_driver(tty_drv);
+err_free_tty:
+        put_tty_driver(tty_drv);
+        return result;
 }
 
 static void __exit hso_exit(void)
@@ -3354,6 +3357,7 @@ static void __exit hso_exit(void)
         printk(KERN_INFO "hso: unloaded\n");
 
         tty_unregister_driver(tty_drv);
+        put_tty_driver(tty_drv);
         /* deregister the usb driver */
         usb_deregister(&hso_driver);
 }