From 04006eabea235d9db8c0f7e40af9e441b25638f8 Mon Sep 17 00:00:00 2001
From: Hans Petter Selasky <hselasky@FreeBSD.org>
Date: Fri, 27 Jun 2014 15:23:12 +0000
Subject: [PATCH] Don't hide zero-length strings when doing sysctl listings.

MFC after:	1 week
---
 sbin/sysctl/sysctl.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sbin/sysctl/sysctl.c b/sbin/sysctl/sysctl.c
index a86d659cb040..13596450d2e1 100644
--- a/sbin/sysctl/sysctl.c
+++ b/sbin/sysctl/sysctl.c
@@ -710,9 +710,10 @@ show_var(int *oid, int nlen)
 		warnx("malloc failed");
 		return (1);
 	}
+	ctltype = (kind & CTLTYPE);
 	len = j;
 	i = sysctl(oid, nlen, val, &len, 0, 0);
-	if (i || !len) {
+	if (i != 0 || (len == 0 && ctltype != CTLTYPE_STRING)) {
 		free(oval);
 		return (1);
 	}
@@ -724,7 +725,6 @@ show_var(int *oid, int nlen)
 	}
 	val[len] = '\0';
 	p = val;
-	ctltype = (kind & CTLTYPE);
 	sign = ctl_sign[ctltype];
 	intlen = ctl_size[ctltype];