Re: CVE request Qemu: display: cirrus_vga: a divide by zero in cirrus_do_copy

[Huawei PSIRT <psirt () huawei com>]

Dear,

Could you please change the reporter information from PSIRTeam of Huawei Inc
to Jiangxin <jiangxin1 () huawei com> of Huawei Inc. Thank you.

Best regards,
Huawei PSIRT

-----邮件原件-----
发件人: P J P [mailto:ppandit () redhat com] 
发送时间: 2016年12月8日 15:32
收件人: oss security list
抄送: liq3ea () gmail com; psirt () huawei com
主题: CVE request Qemu: display: cirrus_vga: a divide by zero in
cirrus_do_copy

   Hello,

Quick emulator(Qemu) built with the Cirrus CLGD 54xx VGA Emulator support is
vulnerable to a divide by zero issue. It could occur while copying VGA data
when cirrus graphics mode was set to be VGA.

A privileged user inside guest could use this flaw to crash the Qemu process
instance on the host, resulting in DoS.

Upstream patch
--------------
   -> https://lists.gnu.org/archive/html/qemu-devel/2016-12/msg00442.html

Reference:
----------
   -> https://bugzilla.redhat.com/show_bug.cgi?id=1334398

This issue was independently reported by Qinghao Tang, Li Qiang of Qihoo
360.cn Inc. and PSIRTeam of Huawei Inc.


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