From e50a322e517731de5d1f6f3aad0a73f3b506c5ea Mon Sep 17 00:00:00 2001
From: Josef Gajdusek <atx@atx.name>
Date: Thu, 9 Oct 2014 15:47:54 +0200
Subject: [PATCH] usb: Do not re-read descriptors for wired devices in
 usb_authorize_device()

This patch modifies the usb_authorize_device() function such as that it does
not reload the device descriptor for wired devices. The reasons for this
are as follows:

* Some devices dislike the master requesting the descriptor from them twice,
  failing on the usb_get_device_descriptor() call with -ETIMEOUT. Observed this
  on my Pretec 16GB flash drive (4146:ba65).

* Malicious device could send two different descriptors - one before
  authorization, used by userspace to determine whether to authorize it and
  second to be actually used by the kernel when determining which drivers to
  bind.

Signed-off-by: Josef Gajdusek <atx@atx.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
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