CVE Request Qemu: usb: xhci memory leakage during device unplug

[P J P <ppandit () redhat com>]

  Hello,

Quick Emulator(Qemu) built with the USB xHCI controller emulation support is 
vulnerable to a memory leakage issue. It could occur while doing a USB device 
unplug operation; Doing so repeatedly would result in leaking host memory, 
affecting other services on the host.

A privileged user inside guest could use this flaw to cause a DoS on the host 
and/or potentially crash the Qemu process instance on the host.

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2016-09/msg02773.html

This issue was reported by Mr Li Qiang of 360.cn Inc.

Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
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