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authorVasiliy Kulikov <segooon@gmail.com>2010-09-05 22:32:22 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2010-10-22 10:20:03 -0700
commitb670bde0b2497966d76154cfb9706c38cf8348f9 (patch)
tree0e85f57a2f6b806ec7a79addfc00a23a8d3c9b3c /drivers/char
parentdf480518a688f0d28f7e7de69abe6a441d1c2c64 (diff)
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>
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/tty_io.c24
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);