staging: vt6656: [BUG] iwctl_siwencodeext return if device not open

Don't allow entry to iwctl_siwencodeext if device not open.

This fixes a race condition where wpa supplicant/network manager
enters the function when the device is already closed.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Cc: stable@vger.kernel.org # 3.8+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/vt6656/iwctl.c b/drivers/staging/vt6656/iwctl.c
index d0cf7d8a20e5640fe507f3ff1b1dc64c170f9408..8872e0f84f40e825efec5dd7f7614f6c22f43562 100644 (file)
--- a/drivers/staging/vt6656/iwctl.c
+++ b/drivers/staging/vt6656/iwctl.c
@@ -1634,6 +1634,9 @@ int iwctl_siwencodeext(struct net_device *dev, struct iw_request_info *info,
        if (pMgmt == NULL)
                return -EFAULT;
 
+       if (!(pDevice->flags & DEVICE_FLAGS_OPENED))
+               return -ENODEV;
+
        buf = kzalloc(sizeof(struct viawget_wpa_param), GFP_KERNEL);
        if (buf == NULL)
                return -ENOMEM;