From a61ff8a1eea921800d6225ff137b24e0a0fb60e1 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Thu, 2 Feb 2017 18:35:00 +0100
Subject: [PATCH] time-util: add overflow checking to monotonic timestamp
 specifications

---
 src/basic/time-util.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/basic/time-util.c b/src/basic/time-util.c
index 265f5995a..6a76b6551 100644
--- a/src/basic/time-util.c
+++ b/src/basic/time-util.c
@@ -857,6 +857,8 @@ from_tm:
                 return -EINVAL;
 
 finish:
+        if (ret + plus < ret) /* overflow? */
+                return -EINVAL;
         ret += plus;
         if (ret > USEC_TIMESTAMP_FORMATTABLE_MAX)
                 return -EINVAL;
-- 
2.30.2