CVE request Qemu: char: use after free issue in char backend

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

  Hello,

Quick Emulator(Qemu) built with the 'chardev' backend support is vulnerable to 
a use after free issue. It could occur while hotplug and unplugging the device 
in the guest.

A guest user/process could use this flaw to crash a Qemu process on the host 
resulting in DoS.

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2016-10/msg05597.html

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