From 8d2d0895229cfbe39c1c5c16e61e426812a72e8b Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Thu, 7 Jul 2022 18:27:02 +0900
Subject: [PATCH] time-util: fix buffer-over-run

Fixes #23928.
---
 src/basic/time-util.c     | 2 +-
 src/test/test-time-util.c | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/basic/time-util.c b/src/basic/time-util.c
index abbc4ad5cd70..26d59de12348 100644
--- a/src/basic/time-util.c
+++ b/src/basic/time-util.c
@@ -591,7 +591,7 @@ char *format_timespan(char *buf, size_t l, usec_t t, usec_t accuracy) {
                         t = b;
                 }
 
-                n = MIN((size_t) k, l);
+                n = MIN((size_t) k, l-1);
 
                 l -= n;
                 p += n;