From 4180f5bf64b6b4338f99ba0eb7d2146ef86c088e Mon Sep 17 00:00:00 2001
From: Minh Phan <pqminh@gmail.com>
Date: Fri, 27 Jan 2017 09:06:08 +0100
Subject: [PATCH] topoh: safety check to avoid crash when there is no via
 header

- based on GH #952

(cherry picked from commit 2367fb52aa94bd06fcbadce7f9ecccdcf6e36c83)
---
 modules/topoh/th_msg.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/modules/topoh/th_msg.c b/modules/topoh/th_msg.c
index 40a956e81be..a070c2705d2 100644
--- a/modules/topoh/th_msg.c
+++ b/modules/topoh/th_msg.c
@@ -954,6 +954,10 @@ int th_add_hdr_cookie(sip_msg_t *msg)
 struct via_param *th_get_via_cookie(sip_msg_t *msg, struct via_body *via)
 {
 	struct via_param *p;
+
+	if (!via) {
+		return NULL;
+	}
 	for(p=via->param_lst; p; p=p->next)
 	{
 		if(p->name.len==th_cookie_name.len