usb: core: check for valid id_table when using the RefId feature

When implementing the RefId feature, it was missed that id_tables can be
NULL under special circumstances. Bail out in that case.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index 620a0baf103e..5d01558cef66 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -73,6 +73,9 @@ ssize_t usb_store_new_id(struct usb_dynids *dynids,
         if (fields > 4) {
                 const struct usb_device_id *id = id_table;
 
+                if (!id)
+                        return -ENODEV;
+
                 for (; id->match_flags; id++)
                         if (id->idVendor == refVendor && id->idProduct == refProduct)
                                 break;