CVE request Qemu: net: mcf_fec: infinite loop while receiving data in mcf_fec_receive

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

  Hello,

Quick Emulator(Qemu) built with the ColdFire Fast Ethernet Controller emulator 
support is vulnerable to an infinite loop issue. It could occur while 
receiving packets in 'mcf_fec_receive'.

A privileged user/process inside guest could use this issue to crash the Qemu 
process on the host leading to DoS.

Upstream patch
--------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2016-11/msg05324.html

Reference:
----------
  -> https://bugzilla.redhat.com/show_bug.cgi?id=1400829

This issue was reported by Wjjzhang of Tencent.com.

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