CVE-2021-20255 QEMU: net: eepro100: stack overflow via infiniterecursion

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

  Hello,

A stack overflow via infinite recursion issue was found in the eepro100 i8255x 
device emulator of QEMU. It could occur while processing controller commands 
due to DMA re-entrancy issue. A guest user/process may use this flaw to 
consume cpu cycles or crash the QEMU process on the host resulting in DoS 
scenario.

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg06098.html

'CVE-2021-20255' assigned by Red Hat Inc.

This issue was reported by Sergej Schumilo, Cornelius Aschermann and Simon 
Werner of Ruhr-University Bochum.


Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
8685 545E B54C 486B C6EB 271E E285 8B5A F050 DE8D