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Char: rocket, remove potential leak in module_init

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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>
This commit is contained in:
Jiri Slaby 2007-10-18 03:06:28 -07:00 committed by Linus Torvalds
parent 57fedc7ae5
commit 4384a3fae1
1 changed files with 20 additions and 14 deletions
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34
drivers/char/rocket.c
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@ -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;
}