From 33520b43ec662e9544e64f794261976bd517fa23 Mon Sep 17 00:00:00 2001
From: Harald Welte <laforge@gnumonks.org>
Date: Sat, 12 Aug 2017 14:54:28 +0200
Subject: lib/in46_addr: Avoid ASSERT() when in46a_ntop() is called on
 uninitialized address

Change-Id: I42d41ec1370b9cc15d372b649d8e1bc78e76af9b
---
 lib/in46_addr.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/lib/in46_addr.c b/lib/in46_addr.c
index 6864c64..4b5fd64 100644
--- a/lib/in46_addr.c
+++ b/lib/in46_addr.c
@@ -62,7 +62,14 @@ int in46a_to_sas(struct sockaddr_storage *out, const struct in46_addr *in)
 /*! Convenience wrapper around inet_ntop() for \ref in46_addr */
 const char *in46a_ntop(const struct in46_addr *in, char *dst, socklen_t dst_size)
 {
-	int af = in46a_to_af(in);
+	int af;
+
+	if (!in || in->len == 0) {
+		strncpy(dst, "UNDEFINED", dst_size);
+		return dst;
+	}
+
+	af = in46a_to_af(in);
 	if (af < 0)
 		return NULL;
 
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