CVE-2018-5683 Qemu: Out-of-bounds read in vga_draw_text routine

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

  Hello,

Quick Emulator(QEMU) built with the VGA emulator support is vulnerable to an 
out-of-bounds access issue in vga_draw_text. It could occur while updating vga 
display area.

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/2018-01/msg02131.html

This issue was reported by Jiang Xin of Huawei.com.

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