CVE-2017-9374 Qemu: usb: ehci host memory leakage during hotunplug

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

  Hello,

Quick Emulator(Qemu) built with the USB EHCI Emulation support is vulnerable 
to a memory leakage issue. It could occur while hot-unplugging the device, as 
it does not release the memory allocated at initialisation.

A guest user/process could use this issue to leak host memory, resulting in 
DoS for host.

Upstream patch:
---------------
  -> http://git.qemu.org/?p=qemu.git;a=commit;h=d710e1e7bd3d5bfc26b631f02ae87901ebe646b0

Reference:
----------
  -> https://bugzilla.redhat.com/show_bug.cgi?id=1459132

This issue was reported by Li Qiang of Qihoo 360 Gear Team.

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