From da8052fefc3717e859257937e8b7d94fac5466fa Mon Sep 17 00:00:00 2001
From: Viktor Dukhovni <postfix-users@dukhovni.org>
Date: Sun, 13 Nov 2016 15:06:40 +1100
Subject: [PATCH] Don't scale SRV weights when none have weight zero

---
 lib/roken/resolve.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/roken/resolve.c b/lib/roken/resolve.c
index 42fdaa301..17484a716 100644
--- a/lib/roken/resolve.c
+++ b/lib/roken/resolve.c
@@ -672,8 +672,9 @@ rk_dns_srv_order(struct rk_dns_reply *r)
 	    if ((*tt)->u.srv->weight == 0)
 		zeros++;
 	}
+	/* With no zeros, add 0 and scale * 1 */
+	sum += zeros ? zeros : zeros++;
 	sum *= zeros;
-	sum += zeros;
 	ee = tt;
 	/* ss is now the first record of this priority and ee is the
            first of the next */