CVE request: Qemu: scsi: pvscsi: infintie loop when building SG list

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

  Hello,

Quick Emulator(Qemu) built with the VMWARE PVSCSI paravirtual SCSI bus 
emulation support is vulnerable to an infinite loop issue. It could occur 
while processing an IO request descriptor, building SG list.

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

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2016-09/msg00772.html

Reference:
----------
  -> https://bugzilla.redhat.com/show_bug.cgi?id=1373478

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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