[PATCH AUTOSEL for 4.4 053/101] rndis_wlan: add return value validation

[Sasha Levin]

From: Pan Bian <bianpan2...@163.com>

[ Upstream commit 9dc7efd3978aa67ae598129d2a3f240b390ce508 ]

Function create_singlethread_workqueue() will return a NULL pointer if
there is no enough memory, and its return value should be validated
before using. However, in function rndis_wlan_bind(), its return value
is not checked. This may cause NULL dereference bugs. This patch fixes
it.

Signed-off-by: Pan Bian <bianpan2...@163.com>
Signed-off-by: Kalle Valo <kv...@codeaurora.org>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
---
 drivers/net/wireless/rndis_wlan.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/wireless/rndis_wlan.c 
b/drivers/net/wireless/rndis_wlan.c
index a13d1f2b5912..259590013382 100644
--- a/drivers/net/wireless/rndis_wlan.c
+++ b/drivers/net/wireless/rndis_wlan.c
@@ -3425,6 +3425,10 @@ static int rndis_wlan_bind(struct usbnet *usbdev, struct 
usb_interface *intf)
 
        /* because rndis_command() sleeps we need to use workqueue */
        priv->workqueue = create_singlethread_workqueue("rndis_wlan");
+       if (!priv->workqueue) {
+               wiphy_free(wiphy);
+               return -ENOMEM;
+       }
        INIT_WORK(&priv->work, rndis_wlan_worker);
        INIT_DELAYED_WORK(&priv->dev_poller_work, rndis_device_poller);
        INIT_DELAYED_WORK(&priv->scan_work, rndis_get_scan_results);
-- 
2.14.1