From: Neil Wilson <neil@aldur.co.uk>
Date: Thu, 23 Feb 2017 17:03:34 +0000 (+0000)
Subject: ntpd: Correct loop offset and error calculation
X-Git-Tag: collectd-5.6.3~9
X-Git-Url: https://git.octo.it/?a=commitdiff_plain;h=c0760b142da433298ea090a5e4963adcc0192080;hp=b8530b9cf75a0b560fdef94f2b80fbe50c22f9c5;p=collectd.git

ntpd: Correct loop offset and error calculation

Stop the scaling calculation dropping the sign of the underlying value

Fixes: #2188
---

diff --git a/src/ntpd.c b/src/ntpd.c
index 1cb59dee..4ed4e7c8 100644
--- a/src/ntpd.c
+++ b/src/ntpd.c
@@ -855,9 +855,9 @@ static int ntpd_read(void) {
   }
 
   /* kerninfo -> estimated error */
-  offset_loop = scale_loop * ((gauge_t)ntohl(ik->offset));
+  offset_loop = (gauge_t)((int32_t)ntohl(ik->offset) * scale_loop);
   freq_loop = ntpd_read_fp(ik->freq);
-  offset_error = scale_error * ((gauge_t)ntohl(ik->esterror));
+  offset_error = (gauge_t)((int32_t)ntohl(ik->esterror) * scale_error);
 
   DEBUG("info_kernel:\n"
         "  pll offset    = %.8g\n"