Bluetooth: Fix crash in the Marvell driver initialization codepath

btmrvl_add_card() function calls kthread_run that might return error
(e.g. if current thread is killed). If one tries to use the error
value as a pointer then invalid memory access oops happens.

Check kthread_run() return value, if it is an error then release resources
correctly.

TEST=boot computer with BT modules enabled. I see the error message that
BT device initialization failed. Now kernel does not crash. Hint: to enable
BT run 'rmmod btmrvl_sdio; modprobe btmrvl_sdio'

Signed-off-by: Anatol Pomozov <anatol.pomozov@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/drivers/bluetooth/btmrvl_main.c b/drivers/bluetooth/btmrvl_main.c
index bae8e6a..1d7db20 100644 (file)
--- a/drivers/bluetooth/btmrvl_main.c
+++ b/drivers/bluetooth/btmrvl_main.c
@@ -710,12 +710,17 @@ struct btmrvl_private *btmrvl_add_card(void *card)
        init_waitqueue_head(&priv->main_thread.wait_q);
        priv->main_thread.task = kthread_run(btmrvl_service_main_thread,
                                &priv->main_thread, "btmrvl_main_service");
+       if (IS_ERR(priv->main_thread.task))
+               goto err_thread;
 
        priv->btmrvl_dev.card = card;
        priv->btmrvl_dev.tx_dnld_rdy = true;
 
        return priv;
 
+err_thread:
+       btmrvl_free_adapter(priv);
+
 err_adapter:
        kfree(priv);