From 9085175a4f9f03bb0d1060ac45bab8347f3f78b9 Mon Sep 17 00:00:00 2001
From: Masakazu Mokuno <masakazu.mokuno@gmail.com>
Date: Fri, 10 Nov 2017 01:25:50 +0900
Subject: [PATCH] USB: core: Add type-specific length check of BOS descriptors

commit 81cf4a45360f70528f1f64ba018d61cb5767249a upstream.

As most of BOS descriptors are longer in length than their header
'struct usb_dev_cap_header', comparing solely with it is not sufficient
to avoid out-of-bounds access to BOS descriptors.

This patch adds descriptor type specific length check in
usb_get_bos_descriptor() to fix the issue.

Signed-off-by: Masakazu Mokuno <masakazu.mokuno@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[bwh: Backported to 3.2:
 - Drop handling of USB_PTM_CAP_TYPE and USB_SSP_CAP_TYPE
 - Adjust filename]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
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