CVE-2017-9503 Qemu: scsi: null pointer dereference while processing megasas command

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

  Hello,

Quick Emulator(Qemu) built with the MegaRAID SAS 8708EM2 Host Bus Adapter 
emulation support is vulnerable to a null pointer dereference issue. It could 
occur while processing megasas commands via megasas_command_complete().

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

Upstream patches:
-----------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2017-06/msg01313.html
  -> https://lists.gnu.org/archive/html/qemu-devel/2017-06/msg01309.html

Reference:
----------
  -> https://bugzilla.redhat.com/show_bug.cgi?id=1459477

This issue was reported by Zhangyanyu.

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