Bluetooth: hci_{ldisc,serdev}: check percpu_init_rwsem() failure

syzbot is reporting NULL pointer dereference at hci_uart_tty_close() [1],
for rcu_sync_enter() is called without rcu_sync_init() due to
hci_uart_tty_open() ignoring percpu_init_rwsem() failure.

While we are at it, fix that hci_uart_register_device() ignores
percpu_init_rwsem() failure and hci_uart_unregister_device() does not
call percpu_free_rwsem().

Link: https://syzkaller.appspot.com/bug?extid=576dfca25381fb6fbc5f
Reported-by: syzbot <syzbot+576dfca25381fb6fbc5f@syzkaller.appspotmail.com>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Fixes: 67d2f8781b9f00d1 ("Bluetooth: hci_ldisc: Allow sleeping while proto locks are held.")
Fixes: d73e172816652772 ("Bluetooth: hci_serdev: Init hci_uart proto_lock to avoid oops")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index f537673ede17440acafc13e3d74040c989e5a733..865112e96ff9fc669258b1ef049c52e997c71575 100644 (file)
--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -493,6 +493,11 @@ static int hci_uart_tty_open(struct tty_struct *tty)
                BT_ERR("Can't allocate control structure");
                return -ENFILE;
        }
+       if (percpu_init_rwsem(&hu->proto_lock)) {
+               BT_ERR("Can't allocate semaphore structure");
+               kfree(hu);
+               return -ENOMEM;
+       }
 
        tty->disc_data = hu;
        hu->tty = tty;
@@ -505,8 +510,6 @@ static int hci_uart_tty_open(struct tty_struct *tty)
        INIT_WORK(&hu->init_ready, hci_uart_init_work);
        INIT_WORK(&hu->write_work, hci_uart_write_work);
 
-       percpu_init_rwsem(&hu->proto_lock);
-
        /* Flush any pending characters in the driver */
        tty_driver_flush_buffer(tty);
 

diff --git a/drivers/bluetooth/hci_serdev.c b/drivers/bluetooth/hci_serdev.c
index c0e5f42ec6b7df50b5fea4e67deee6e00f39440c..f16fd79bc02b8ab6c8e984faf6bf4c5bdb42bd8f 100644 (file)
--- a/drivers/bluetooth/hci_serdev.c
+++ b/drivers/bluetooth/hci_serdev.c
@@ -310,11 +310,12 @@ int hci_uart_register_device(struct hci_uart *hu,
 
        serdev_device_set_client_ops(hu->serdev, &hci_serdev_client_ops);
 
+       if (percpu_init_rwsem(&hu->proto_lock))
+               return -ENOMEM;
+
        err = serdev_device_open(hu->serdev);
        if (err)
-               return err;
-
-       percpu_init_rwsem(&hu->proto_lock);
+               goto err_rwsem;
 
        err = p->open(hu);
        if (err)
@@ -389,6 +390,8 @@ int hci_uart_register_device(struct hci_uart *hu,
        p->close(hu);
 err_open:
        serdev_device_close(hu->serdev);
+err_rwsem:
+       percpu_free_rwsem(&hu->proto_lock);
        return err;
 }
 EXPORT_SYMBOL_GPL(hci_uart_register_device);
@@ -410,5 +413,6 @@ void hci_uart_unregister_device(struct hci_uart *hu)
                clear_bit(HCI_UART_PROTO_READY, &hu->flags);
                serdev_device_close(hu->serdev);
        }
+       percpu_free_rwsem(&hu->proto_lock);
 }
 EXPORT_SYMBOL_GPL(hci_uart_unregister_device);