CVE-2017-5993 Virglrenderer: host memory leakage when initialising blitter context

[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 memory leakage issue. It could occur when 
a guest tries to initialise blitter context via 'VIRGL_CCMD_BLIT' command.

A guest user/process could use this flaw to leak host memory resulting in DoS.

Upstream patch:
---------------
  -> https://cgit.freedesktop.org/virglrenderer/commit/?id=6eb13f7a2dcf391ec9e19b4c2a79e68305f63c22

Reference:
----------
  -> https://bugzilla.redhat.com/show_bug.cgi?id=1422438

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

'CVE-2017-5993' assigned via -> https://cveform.mitre.org/

Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F