CVE-2017-7377 Qemu: 9pfs: host memory leakage via v9fs_create

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

  Hello,

Quick Emulator(Qemu) built with the virtio-9p back-end support is vulnerable 
to a memory leakage issue. It could occur while doing a I/O operation via 
v9fs_create/v9fs_lcreate routine.

A privileged user/process inside guest could use this flaw to leak host memory 
resulting in Dos.

Upstream patch:
---------------
  -> http://git.qemu-project.org/?p=qemu.git;a=commit;h=d63fb193e71644a073b77ff5ac6f1216f2f6cf6e

Reference:
----------
  -> https://bugzilla.redhat.com/show_bug.cgi?id=1437871

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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