From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pan Bian Subject: [PATCH 1/1] cfg80211: add return value validation Date: Sun, 23 Apr 2017 21:27:03 +0800 Message-ID: <1492954023-8596-1-git-send-email-bianpan201603@163.com> Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Pan Bian To: Jussi Kivilinna , Kalle Valo , linux-wireless-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Return-path: Sender: linux-wireless-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: netdev.vger.kernel.org From: Pan Bian 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 --- 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 785334f..92a1bde 100644 --- a/drivers/net/wireless/rndis_wlan.c +++ b/drivers/net/wireless/rndis_wlan.c @@ -3427,6 +3427,10 @@ 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); -- 1.9.1