CVE-2017-10664 Qemu: qemu-nbd: server breaks with SIGPIPE upon client abort

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

  Hello,

Quick Emulator(Qemu) built with the Network Block Device(NBD) Server support 
is vulnerable to a crash via SIGPIPE signal. It could occur if a client aborts 
connection due to any failure during 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/2017-06/msg02693.html

Reference:
----------
  -> https://bugzilla.redhat.com/show_bug.cgi?id=1466190


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