From 7187e8ecd29717cb711b5e89e1ee3e71afe4d42f Mon Sep 17 00:00:00 2001
From: Chris Rienzo <chris@signalwire.com>
Date: Mon, 15 Apr 2019 19:58:32 +0000
Subject: [PATCH] FS-11785 [libteletone] Fix unlikely divide by zero in
 teletone_mux_tones

---
 libs/libteletone/src/libteletone_generate.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libs/libteletone/src/libteletone_generate.c b/libs/libteletone/src/libteletone_generate.c
index f052c1fe9e..94ae14d228 100644
--- a/libs/libteletone/src/libteletone_generate.c
+++ b/libs/libteletone/src/libteletone_generate.c
@@ -256,7 +256,9 @@ TELETONE_API(int) teletone_mux_tones(teletone_generation_session_t *ts, teletone
 				int32_t s = teletone_dds_state_modulate_sample(&tones[i], 0);
 				sample += s;
 			}
-			sample /= freqlen;
+			if (freqlen) {
+				sample /= freqlen;
+			}
 			ts->buffer[ts->samples] = (teletone_audio_t)sample;
 			
 			for (c = 1; c < ts->channels; c++) {