From b5ce9d8f9a1b1fd705ad4b533e7cbc9166a3f577 Mon Sep 17 00:00:00 2001
From: Daniel-Constantin Mierla <miconda@gmail.com>
Date: Mon, 11 Mar 2019 09:57:57 +0100
Subject: [PATCH] topoh: check returned pointer when decoding call-id

---
 src/modules/topoh/th_msg.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/modules/topoh/th_msg.c b/src/modules/topoh/th_msg.c
index e03b3653faf..6849520540b 100644
--- a/src/modules/topoh/th_msg.c
+++ b/src/modules/topoh/th_msg.c
@@ -559,6 +559,10 @@ int th_unmask_callid_str(str *icallid, str *ocallid)
 	}
 	out.s = th_mask_decode(icallid->s, icallid->len,
 					&th_callid_prefix, 0, &out.len);
+	if(out.s == NULL) {
+		LM_ERR("failed to decode call-id\n");
+		return -2;
+	}
 	if(out.len>=TH_CALLID_SIZE) {
 		pkg_free(out.s);
 		LM_ERR("not enough callid buf size (needed %d)\n", out.len);