From 4b03a47a7fce86d8bb2bd6235675f0864f7720bf Mon Sep 17 00:00:00 2001
From: Andrey Volk <andywolk@gmail.com>
Date: Thu, 1 Apr 2021 23:53:57 +0300
Subject: [PATCH] [Core] Fix dereference of null pointer in
 switch_ivr_wait_for_answer()

---
 src/switch_ivr_originate.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/switch_ivr_originate.c b/src/switch_ivr_originate.c
index 9785d0b7aa..31ce629d40 100644
--- a/src/switch_ivr_originate.c
+++ b/src/switch_ivr_originate.c
@@ -1145,6 +1145,11 @@ SWITCH_DECLARE(switch_status_t) switch_ivr_wait_for_answer(switch_core_session_t
 
 		if (read_frame && !pass) {
 
+			if (!write_frame.codec) {
+				status = SWITCH_STATUS_FALSE;
+				break;
+			}
+
 			if (ringback.fh) {
 				switch_size_t mlen, olen;
 				unsigned int pos = 0;