CVE request Qemu: char: divide by zero error in serial_update_parameters

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

  Hello,

Quick Emulator(Qemu) built with the 16550A UART emulation support is 
vulnerable to a divide by zero issue. It could occur while updating serial 
device parameters in 'serial_update_parameters'.

A privileged guest user could use this flaw to crash the Qemu process instance 
on the host, resulting in DoS.

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2016-10/msg02461.html

Reference:
----------
  -> https://bugzilla.redhat.com/show_bug.cgi?id=1384909

This issue was reported by Huawei Product Security Incident Response Team 
(PSIRT), Huawei Inc.


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