From b156f4d03f6d3a65a59fe7d6f0217fca2c8fdf60 Mon Sep 17 00:00:00 2001
From: Moises Silva <moises.silva@gmail.com>
Date: Fri, 3 Dec 2010 14:13:43 -0500
Subject: [PATCH] freetdm: do not write to io dump if is not enabled

---
 libs/freetdm/src/ftdm_io.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libs/freetdm/src/ftdm_io.c b/libs/freetdm/src/ftdm_io.c
index c43d694dee..495be78ff1 100644
--- a/libs/freetdm/src/ftdm_io.c
+++ b/libs/freetdm/src/ftdm_io.c
@@ -91,6 +91,10 @@ static void write_chan_io_dump(ftdm_channel_t *fchan, ftdm_io_dump_t *dump, char
 	int windex = dump->windex;
 	int avail = dump->size - windex;
 
+	if (!dump->buffer) {
+		return;
+	}
+
 	if (dlen > avail) {
 		int diff = dlen - avail;