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

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

From: Colin Ian King <colin.k...@canonical.com>

commit df3334c223a033f562645712e832ca4cbb326bbf upstream.

Currently the driver attempts to spin lock on udc->lock before a NULL
pointer check is performed on udc, hence there is a potential null
pointer dereference on udc->lock.  Fix this by moving the null check
on udc before the lock occurs.

Fixes: ea6873a45a22 ("usbip: vudc: Add SysFS infrastructure for VUDC")
Signed-off-by: Colin Ian King <colin.k...@canonical.com>
Acked-by: Shuah Khan <shua...@osg.samsung.com>
Reviewed-by: Krzysztof Opasiak <k.opas...@samsung.com>
Cc: stable <sta...@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/usb/usbip/vudc_sysfs.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/drivers/usb/usbip/vudc_sysfs.c
+++ b/drivers/usb/usbip/vudc_sysfs.c
@@ -105,10 +105,14 @@ static ssize_t store_sockfd(struct devic
        if (rv != 0)
                return -EINVAL;
 
+       if (!udc) {
+               dev_err(dev, "no device");
+               return -ENODEV;
+       }
        spin_lock_irqsave(&udc->lock, flags);
        /* Don't export what we don't have */
-       if (!udc || !udc->driver || !udc->pullup) {
-               dev_err(dev, "no device or gadget not bound");
+       if (!udc->driver || !udc->pullup) {
+               dev_err(dev, "gadget not bound");
                ret = -ENODEV;
                goto unlock;
        }


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