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tty_io: check return code of tty_register_device

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Function tty_register_device may return ERR_PTR(...). Check for it.

Signed-off-by: Vasiliy Kulikov <segooon@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Vasiliy Kulikov 2010-09-05 22:32:22 +04:00 committed by Greg Kroah-Hartman
parent df480518a6
commit b670bde0b2
1 changed files with 22 additions and 2 deletions
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24
drivers/char/tty_io.c
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@ -3004,6 +3004,7 @@ int tty_register_driver(struct tty_driver *driver)
int i;
dev_t dev;
void **p = NULL;
struct device *d;
if (!(driver->flags & TTY_DRIVER_DEVPTS_MEM) && driver->num) {
p = kzalloc(driver->num * 2 * sizeof(void *), GFP_KERNEL);
@ -3051,12 +3052,31 @@ int tty_register_driver(struct tty_driver *driver)
mutex_unlock(&tty_mutex);
if (!(driver->flags & TTY_DRIVER_DYNAMIC_DEV)) {
for (i = 0; i < driver->num; i++)
tty_register_device(driver, i, NULL);
for (i = 0; i < driver->num; i++) {
d = tty_register_device(driver, i, NULL);
if (IS_ERR(d)) {
error = PTR_ERR(d);
goto err;
}
}
}
proc_tty_register_driver(driver);
driver->flags |= TTY_DRIVER_INSTALLED;
return 0;
err:
for (i--; i >= 0; i--)
tty_unregister_device(driver, i);
mutex_lock(&tty_mutex);
list_del(&driver->tty_drivers);
mutex_unlock(&tty_mutex);
unregister_chrdev_region(dev, driver->num);
driver->ttys = NULL;
driver->termios = NULL;
kfree(p);
return error;
}
EXPORT_SYMBOL(tty_register_driver);