From b00ce05fc42eb7497880cb177025dc12b3b85d63 Mon Sep 17 00:00:00 2001
From: Richard Fuchs <rfuchs@sipwise.com>
Date: Wed, 26 Jan 2022 13:51:15 -0500
Subject: [PATCH] TT#14008 prevent possible NULL dereference

closes #1434

Change-Id: I21fa86b0410f86cd6d77951cff75c5eb03da38e9
(cherry picked from commit 1bc15de7468914000558c0606b3ff02a5c8b586e)
---
 lib/codeclib.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/codeclib.c b/lib/codeclib.c
index 3278bad49..885fd68da 100644
--- a/lib/codeclib.c
+++ b/lib/codeclib.c
@@ -742,6 +742,9 @@ void decoder_close(decoder_t *dec) {
 
 
 static int avc_decoder_input(decoder_t *dec, const str *data, GQueue *out) {
+	if (!dec->u.avc.avpkt)
+		return -1; // decoder shut down
+
 	const char *err;
 	int av_ret = 0;
 
@@ -2322,6 +2325,8 @@ static int amr_dtx(decoder_t *dec, GQueue *out, int ptime) {
 static int generic_silence_dtx(decoder_t *dec, GQueue *out, int ptime) {
 	if (dec->dec_out_format.format == -1)
 		return -1;
+	if (!dec->u.avc.avpkt)
+		return -1;
 
 	if (ptime <= 0)
 		ptime = 20;