CVE-2020-27616 QEMU: ati-vga: potential crash via invalid x y parameter values

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

  Hello,

An out-of-bounds access issue was found in the ati-vga emulator of the QEMU. 
It could occur when the source and destination x,y display parameters in 
ati_2d_blt() have invalid values. A guest user/process may use this flaw to 
crash the QEMU process resulting in DoS scenario.

Upstream patch:
---------------
  -> https://lists.nongnu.org/archive/html/qemu-devel/2020-10/msg06080.html

This issue is reported by Gaoning Pan of Zhejiang University.

'CVE-2020-27616' assigned via -> https://cveform.mitre.org/

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