From: Wolfram Sang <wsa@the-dreams.de>
Date: Mon, 13 Jan 2014 10:29:23 +0000 (+0100)
Subject: usb: core: check for valid id_table when using the RefId feature
X-Git-Tag: next-20140116~16^2~7
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=1b9fb31f;p=karo-tx-linux.git

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 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;