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| author | Vasiliy Kulikov <segooon@gmail.com> | 2010-09-05 22:32:22 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-10-22 10:20:03 -0700 |
| commit | b670bde0b2497966d76154cfb9706c38cf8348f9 (patch) | |
| tree | 0e85f57a2f6b806ec7a79addfc00a23a8d3c9b3c | |
| parent | df480518a688f0d28f7e7de69abe6a441d1c2c64 (diff) | |
| download | lwn-b670bde0b2497966d76154cfb9706c38cf8348f9.tar.gz lwn-b670bde0b2497966d76154cfb9706c38cf8348f9.zip | |
tty_io: check return code of tty_register_device
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>
| -rw-r--r-- | drivers/char/tty_io.c | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c index d6c659f2f659..e185db36f8ad 100644 --- a/drivers/char/tty_io.c +++ b/drivers/char/tty_io.c @@ -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); |