CVE-2017-5957 Virglrenderer: stack overflow in vrend_decode_set_framebuffer_state

[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 stack buffer overflow issue. It could 
occur when in vrend_decode_set_framebuffer_state.

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=926b9b3460a48f6454d8bbe9e44313d86a65447f

Reference:
----------
  -> https://bugzilla.redhat.com/show_bug.cgi?id=1421126

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

'CVE-2017-5957' assigned via -> https://cveform.mitre.org/

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