RDMA/rxe: Verify modify_device mask

Verify that the passed mask to rxe_modify_device() is supported.

Link: https://lore.kernel.org/r/20190923104158.5331-4-kamalheib1@gmail.comSigned-off-by: Kamal Heib <kamalheib1@gmail.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/sw/rxe/rxe_verbs.c

@@ -106,6 +106,10 @@ static int rxe_modify_device(struct ib_device *dev,
 {
 	struct rxe_dev *rxe = to_rdev(dev);
 
+	if (mask & ~(IB_DEVICE_MODIFY_SYS_IMAGE_GUID |
+		     IB_DEVICE_MODIFY_NODE_DESC))
+		return -EOPNOTSUPP;
+
 	if (mask & IB_DEVICE_MODIFY_SYS_IMAGE_GUID)
 		rxe->attr.sys_image_guid = cpu_to_be64(attr->sys_image_guid);