CVE-2017-5956 virglrenderer: Virglrenderer: OOB access while in vrend_draw_vbo

[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 an OOB array access issue. It could occur 
when in vrend_draw_vbo.

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=a5ac49940c40ae415eac0cf912eac7070b4ba95d

Reference:
----------
  -> https://bugzilla.redhat.com/show_bug.cgi?id=1421073

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

'CVE-2017-5956' assigned via -> https://cveform.mitre.org/

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