Char: rocket, remove potential leak in module_init

if (controller && !request_region) then we leaked a tty driver struct, fix it
by adding function deinit tail with goto-ing into it (and from other fail
paths too)

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/char/rocket.c b/drivers/char/rocket.c
index ffcd8b4..abe3ad0 100644 (file)
--- a/drivers/char/rocket.c
+++ b/drivers/char/rocket.c
@@ -2359,14 +2359,14 @@ static const struct tty_operations rocket_ops = {
  */
 static int __init rp_init(void)
 {
-       int retval, pci_boards_found, isa_boards_found, i;
+       int ret = -ENOMEM, pci_boards_found, isa_boards_found, i;
 
        printk(KERN_INFO "RocketPort device driver module, version %s, %s\n",
               ROCKET_VERSION, ROCKET_DATE);
 
        rocket_driver = alloc_tty_driver(MAX_RP_PORTS);
        if (!rocket_driver)
-               return -ENOMEM;
+               goto err;
 
        /*
         *  If board 1 is non-zero, there is at least one ISA configured.  If controller is 
@@ -2381,8 +2381,11 @@ static int __init rp_init(void)
 
        /*  If an ISA card is configured, reserve the 4 byte IO space for the Mudbac controller */
        if (controller && (!request_region(controller, 4, "Comtrol RocketPort"))) {
-               printk(KERN_INFO "Unable to reserve IO region for first configured ISA RocketPort controller 0x%lx.  Driver exiting \n", controller);
-               return -EBUSY;
+               printk(KERN_ERR "Unable to reserve IO region for first "
+                       "configured ISA RocketPort controller 0x%lx.  "
+                       "Driver exiting\n", controller);
+               ret = -EBUSY;
+               goto err_tty;
        }
 
        /*  Store ISA variable retrieved from command line or .conf file. */
@@ -2423,11 +2426,10 @@ static int __init rp_init(void)
 #endif
        tty_set_operations(rocket_driver, &rocket_ops);
 
-       retval = tty_register_driver(rocket_driver);
-       if (retval < 0) {
-               printk(KERN_INFO "Couldn't install tty RocketPort driver (error %d)\n", -retval);
-               put_tty_driver(rocket_driver);
-               return -1;
+       ret = tty_register_driver(rocket_driver);
+       if (ret < 0) {
+               printk(KERN_ERR "Couldn't install tty RocketPort driver\n");
+               goto err_tty;
        }
 
 #ifdef ROCKET_DEBUG_OPEN
@@ -2454,14 +2456,18 @@ static int __init rp_init(void)
        max_board = pci_boards_found + isa_boards_found;
 
        if (max_board == 0) {
-               printk(KERN_INFO "No rocketport ports found; unloading driver.\n");
-               del_timer_sync(&rocket_timer);
-               tty_unregister_driver(rocket_driver);
-               put_tty_driver(rocket_driver);
-               return -ENXIO;
+               printk(KERN_ERR "No rocketport ports found; unloading driver\n");
+               ret = -ENXIO;
+               goto err_ttyu;
        }
 
        return 0;
+err_ttyu:
+       tty_unregister_driver(rocket_driver);
+err_tty:
+       put_tty_driver(rocket_driver);
+err:
+       return ret;
 }