CVE-2017-9524 Qemu: nbd: segmentation fault due to client non-negotiation

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

   Hello,

Quick Emulator(Qemu) built with the Network Block Device(NBD) Server support 
is vulnerable to a null pointer dereference issue. It could occur while 
releasing a client, which was not initialised due to failed negotiation.

A remote user/process could use this flaw to crash the qemu-nbd server 
resulting in DoS.

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2017-05/msg06240.html
  -> https://lists.gnu.org/archive/html/qemu-devel/2017-06/msg02321.html

'CVE-2017-9524' assigned via -> https://cveform.mitre.org/

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