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vt: bound buffer access in redraw optimization

Description

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

Details

Provenance
emasteAuthored on Sep 22 2021, 6:41 PM
Reviewer
rGee97b2336aa4: Speed up vt(4) by keeping a record of the most recently drawn character and
Differential Revision
Restricted Differential Revision
Parents
rGa165b4591e48: MFC r368649 / 3fd989da by kib: amd64 pmap: fix PCID mode invalidations
Branches
Unknown
Tags
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