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[UPSTREAM] vis(3) avoid out-of-bounds stack buffer reads
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Authored by arichardson on Jun 15 2021, 12:27 PM.

Details

Summary

I found this while running kdump(1) on a CheriBSD system due to a
capability length violation when printing the /etc/libmap.conf read()
system call: it crashed immediately after printing the first line.

Found by: CHERI

Test Plan

No longer crashes with this change

Diff Detail

Repository
rG FreeBSD src repository
Lint
Automatic diff as part of commit; lint not applicable.
Unit
Automatic diff as part of commit; unit tests not applicable.