prevent buffer destroy race

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@13219 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/switch_core_io.c

@@ -915,6 +915,9 @@ SWITCH_DECLARE(switch_status_t) switch_core_session_write_frame(switch_core_sess
 			} else {
 				switch_size_t x;
 				for (x = 0; x < frames; x++) {
+					if (switch_channel_down(session->channel) || !session->raw_write_buffer) {
+						goto error;
+					}
 					if ((session->raw_write_frame.datalen = (uint32_t)
 						 switch_buffer_read(session->raw_write_buffer, session->raw_write_frame.data, bytes)) != 0) {
 						int rate;

src/switch_core_session.c

@@ -879,9 +879,15 @@ SWITCH_DECLARE(void) switch_core_session_reset(switch_core_session_t *session, s
 	switch_mutex_unlock(session->resample_mutex);
 	/* clear indications */
 	switch_core_session_flush_message(session);
+
 	/* wipe these, they will be recreated if need be */
-	switch_buffer_destroy(&session->raw_read_buffer);
+	switch_mutex_lock(session->codec_write_mutex);
 	switch_buffer_destroy(&session->raw_write_buffer);
+	switch_mutex_unlock(session->codec_write_mutex);
+
+	switch_mutex_lock(session->codec_read_mutex);
+	switch_buffer_destroy(&session->raw_read_buffer);
+	switch_mutex_unlock(session->codec_read_mutex);
 
 	if (flush_dtmf) {
 		while ((has = switch_channel_has_dtmf(channel))) {