CVE-2017-8086 Qemu: 9pfs: host memory leakage via v9pfs_list_xattr

[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 querying file system extended 
attributes via 9pfs_list_xattr() routine.

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

Upstream patch:
---------------
  -> http://git.qemu.org/?p=qemu.git;a=commit;h=4ffcdef4277a91af15a3c09f7d16af072c29f3f2

Reference:
----------
  -> https://bugzilla.redhat.com/show_bug.cgi?id=1444781

This issue was reported by Li Qiang of Qihoo 360 Gear Team.

'CVE-2017-8086' assigned via -> http://cveform.mitre.org/

Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F