From: Josef Gajdusek <atx@atx.name>
Date: Thu, 9 Oct 2014 13:47:54 +0000 (+0200)
Subject: usb: Do not re-read descriptors for wired devices in usb_authorize_device()
X-Git-Tag: omap-for-v3.19/fixes-rc1~87^2~105
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e50a322e517731de5d1f6f3aad0a73f3b506c5ea;p=pandora-kernel.git

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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