CVS commit: src/sys/kern

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

Module Name:    src
Committed By:   riastradh
Date:           Sun Mar 13 17:52:46 UTC 2022

Modified Files:
        src/sys/kern: subr_time.c

Log Message:
kern: Fix fencepost error in ts2timo overflow checks.

Triggered by

clock_settime({.tv_sec=0, .tv_nsec=0})
clock_nanosleep({.tv_sec=LLONG_MIN, .tv_nsec=0})

so that, by the time we enter ts2timo (after a few nanoseconds have
passed), we end up with

tsd = {.tv_sec=0, .tv_nsec=nonzero}
ts = {.tv_sec=LLONG_MIN, .tv_nsec=0}

and the subtraction ts - tsd leads to a borrow from tv_sec.

Reported-by: syzbot+14818113e9d0b45bca64%syzkaller.appspotmail.com@localhost


To generate a diff of this commit:
cvs rdiff -u -r1.31 -r1.32 src/sys/kern/subr_time.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.