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>

diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index 620a0ba..5d01558 100644 (file)
--- 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;