CVE-2017-13711 Qemu: Slirp: use-after-free when sending response

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

   Hello,

Quick emulator(Qemu) built with the Slirp networking support is vulnerable to 
an use-after-free issue. It occurs due to Socket referenced from multiple 
packets is freed while responding to a message.

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

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2017-08/msg05201.html

Reference:
----------
  -> https://bugzilla.redhat.com/show_bug.cgi?id=1486400

This issue was reported by Wjjzhang.

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