CVE-2017-7539 Qemu: qemu-nbd crashes due to undefined I/O coroutine

[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 assertion failure. It could occur if a client 
sent undue data during initial connection negotiation.

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

Upstream patch:
---------------
  -> http://git.qemu.org/?p=qemu.git;a=commitdiff;h=2b0bbc4f8809c972bad134bc1a2570dbb01dea0b

Introduced by:
--------------
  -> http://git.qemu.org/?p=qemu.git;a=commitdiff;h=ff82911cd3f69f028f2537825c9720ff78bc3f19

Reference:
----------
  -> https://bugzilla.redhat.com/show_bug.cgi?id=1473622

'CVE-2017-7539' assigned by Red Hat Inc.

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