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2022-01-11T18:33:21.703596Z
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V 553
vt: bound buffer access in redraw optimization

PR:		248628
Reported by:	oleg
Reviewed by:	cem, oleg (both earlier)
Fixes:		ee97b2336aa4 ("Speed up vt(4) by keeping...")
MFC after:	3 days
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D32059

(cherry picked from commit dbc7ca59451561a179f9852642e13ef024169d84)
(cherry picked from commit e4fcff8ee124f8faed2f1fcc1e15b7ae6906d4d7)

Approved by:	so
Security:	FreeBSD-SA-22:01.vt

Git Hash:   9c9d0d90512f0e5950b179d1a07f717ad7c8fe28
Git Author: emaste@FreeBSD.org
END