linux-kernel - [PATCH 3.16.y-ckt 063/168] Bluetooth: Fix crash in the Marvell driver initialization codepath

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Message-Id: <1418653622-21105-64-git-send-email-luis.henriques@canonical.com>
Date:	Mon, 15 Dec 2014 14:25:17 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Anatol Pomozov <anatol.pomozov@...il.com>,
	Marcel Holtmann <marcel@...tmann.org>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 063/168] Bluetooth: Fix crash in the Marvell driver initialization codepath

3.16.7-ckt3 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Anatol Pomozov <anatol.pomozov@...il.com>

commit 8500d791c458ccbbb3e2d3fa9a0320ffd5729069 upstream.

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@...il.com>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/bluetooth/btmrvl_main.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/bluetooth/btmrvl_main.c b/drivers/bluetooth/btmrvl_main.c
index 3ecba5c979bd..ae0b48471ffc 100644
--- a/drivers/bluetooth/btmrvl_main.c
+++ b/drivers/bluetooth/btmrvl_main.c
@@ -667,12 +667,17 @@ 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);
 
-- 
2.1.3

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