CVE-2017-5973 Qemu: usb: infinite loop while doing control transfer in xhci_kick_epctx

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

  Hello,

Quick emulator(Qemu) built with the USB xHCI controller emulator support is 
vulnerable to an infinite loop issue. It could occur while processing control 
transfer descriptor's sequence in xhci_kick_epctx.

A privileged user inside guest could use this flaw to crash the Qemu process 
resulting in DoS.

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2017-02/msg01101.html

Reference:
----------
  -> https://bugzilla.redhat.com/show_bug.cgi?id=1421626

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

'CVE-2017-5973' assigned via -> https://cveform.mitre.org/

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