CVE-2017-6210 Virglrenderer: null pointer dereference in vrend_decode_reset

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

  Hello,

Virgil 3d project, used by Quick Emulator(Qemu) to implement 3D GPU support 
for the virtio GPU, is vulnerable to a null pointer dereference flaw. It could 
occur when destroying renderer context zero(0) in 'vrend_decode_reset'.

A guest user/process could use this flaw to crash the Qemu process instance 
resulting DoS.

Upstream patch:
---------------
  -> https://cgit.freedesktop.org/virglrenderer/commit/?id=0a5dff15912207b83018485f83e067474e818bab

Reference:
----------
  -> https://bugzilla.redhat.com/show_bug.cgi?id=1426170

This issue was reported by Li Qiang of 360.cn Inc.

'CVE-2017-6210' assigned via -> http://cveform.mitre.org/

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