CVE request Qemu: 9pfs: integer overflow leading to OOB access

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

  Hello,

Quick Emulator(Qemu) built with the VirtFS, host directory sharing via Plan 9 
File System(9pfs) support, is vulnerable to an integer overflow issue. It 
could occur by accessing xattributes values.

A privileged user inside guest could use this flaw to crash the Qemu process 
instance resulting in DoS.

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2016-10/msg02942.html

Reference:
----------
  -> http://wiki.qemu.org/Documentation/9psetup

This issue was reported by Li Qiang of 360.cn Inc.

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