CVE-2018-19489 QEMU: 9pfs: crash due to race condition in renaming files

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

  Hello,

A use-after-free flaw was found in the VirtFS, host directory sharing via Plan 
9 File System(9pfs) support in QEMU. It could occur due to a race condition 
while renaming files on a shared host directory.

A user inside guest could use this flaw to crash the QEMU process resulting in 
DoS issue.

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2018-11/msg04489.html

This issue was reported by Zhibin Hu.

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