CVE-2020-13800 QEMU: ati-vga: infinite recursion in ati_mm_read/write calls may lead to DoS

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

  Hello,

An infinite recursion issue was found in the ati-vga emulator of the QEMU. It 
could occur in ati_mm_read/write routines while accessing VGA registers, for 
certain values of the 'mm_index' variable. A guest user/process may use this 
flaw to crash the QEMU process resulting in DoS scenario.

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2020-06/msg00833.html

This issue was reported by Ren Ding and Hanqing Zhao of SSLab Georgia Tech and 
Yi Ren(CC'd)

'CVE-2020-13800' requeted via -> https://cveform.mitre.org/

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