CVE-2018-20815 QEMU: device_tree: heap buffer overflow while loading device tree blob

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

  Hello,

A heap buffer overflow issue was found in the load_device_tree() function of 
QEMU, which is invoked to load device tree blob at boot time. It occurs due to 
device tree size manipulation before buffer allocation, which could overflow a 
signed int type.

A user/process could use this flaw to potentially execute arbitrary code on a 
host system with privileges of the QEMU process.

Upstream patch:
---------------
  -> https://git.qemu.org/?p=qemu.git;a=commitdiff;h=da885fe1ee8b4589047484bd7fa05a4905b52b17

'CVE-2018-20815' assigned via -> https://cveform.mitre.org/

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