4.4-stable review patch. If anyone has any objections, please let me know.
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From: Pan Bian bianpan2016@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 bianpan2016@163.com Signed-off-by: Kalle Valo kvalo@codeaurora.org Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/wireless/rndis_wlan.c | 4 ++++ 1 file changed, 4 insertions(+)
--- 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
/* 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);