CVE request: Qemu: scsi: pvscsi: OOB read and infinite loop while setting descriptor rings

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

  Hello,

Quick Emulator(Qemu) built with the VMWARE PVSCSI paravirtual SCSI bus 
emulation support is vulnerable to an OOB access and/or infinite loop issue. 
It could occur while processing SCSI commands 'PVSCSI_CMD_SETUP_RINGS'.

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/msg00050.html

Reference:
----------
  -> https://bugzilla.redhat.com/show_bug.cgi?id=1373462


These issues were reported by Vivtor V and Li Quiang of 360.cn Inc.

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