From 4e463df100c2963c77d64a7b85e3a335baf988d6 Mon Sep 17 00:00:00 2001
From: Thomas Haller <thaller@redhat.com>
Date: Tue, 22 May 2018 20:03:44 +0200
Subject: [PATCH] libnm: allow nm_utils_hwaddr_valid() of length zero

nm_utils_hwaddr_valid() is used for validating strings. It should
not assert against calling it with an empty string "". That is just
an invalid hwaddr.
---
 libnm-core/nm-utils.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/libnm-core/nm-utils.c b/libnm-core/nm-utils.c
index a6d6486fac..a7b896314f 100644
--- a/libnm-core/nm-utils.c
+++ b/libnm-core/nm-utils.c
@@ -3827,9 +3827,11 @@ nm_utils_hwaddr_valid (const char *asc, gssize length)
 		if (!hwaddr_aton (asc, buf, length, &l))
 			return FALSE;
 		return length == l;
-	} else if (length == -1) {
+	} else if (length == -1)
 		return !!hwaddr_aton (asc, buf, sizeof (buf), &l);
-	} else
+	else if (length == 0)
+		return FALSE;
+	else
 		g_return_val_if_reached (FALSE);
 }