From b670bde0b2497966d76154cfb9706c38cf8348f9 Mon Sep 17 00:00:00 2001 From: Vasiliy Kulikov Date: Sun, 5 Sep 2010 22:32:22 +0400 Subject: [PATCH] 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 Signed-off-by: Greg Kroah-Hartman --- drivers/char/tty_io.c | 24 ++++++++++++++++++++++-- 1 file 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);