Gordon Tetlow 39040a9ec4 Always treat firmware request and response sizes as unsigned.
This fixes an incomplete bounds check on the guest-supplied request
size where a very large request size could be interpreted as a negative
value and not be caught by the bounds check.

Submitted by:	jhb
Reported by:	Reno Robert
Approved by:	so
Security:	FreeBSD-SA-18:14.bhyve
Security:	CVE-2018-17160
2018-12-04 18:28:25 +00:00
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