tty: don't leak cdev in tty_cdev_add()

Commit a3a10ce3429e ("Avoid usb reset crashes by making tty_io cdevs truly
dynamic") which mixes using cdev_alloc() and cdev_init() is problematic.
Subsequent call to cdev_init() after cdev_alloc() sets kobj release method
from cdev_dynamic_release() to cdev_default_release() and thus makes it
impossible to free allocated cdev.

This patch also consolidates error path of cdev_add() as cdev can also leak
here if things went wrong.

Signed-off-by: Leon Yu <chianglungyu@gmail.com>
Fixes: a3a10ce3429e ("Avoid usb reset crashes by making tty_io cdevs truly dynamic")
Acked-by: Richard Watts <rrw@kynesim.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 02785d844354..17b027242734 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -3151,13 +3151,18 @@ struct class *tty_class;
 static int tty_cdev_add(struct tty_driver *driver, dev_t dev,
                 unsigned int index, unsigned int count)
 {
+        int err;
+
         /* init here, since reused cdevs cause crashes */
         driver->cdevs[index] = cdev_alloc();
         if (!driver->cdevs[index])
                 return -ENOMEM;
-        cdev_init(driver->cdevs[index], &tty_fops);
+        driver->cdevs[index]->ops = &tty_fops;
         driver->cdevs[index]->owner = driver->owner;
-        return cdev_add(driver->cdevs[index], dev, count);
+        err = cdev_add(driver->cdevs[index], dev, count);
+        if (err)
+                kobject_put(&driver->cdevs[index]->kobj);
+        return err;
 }
 
 /**