From 7983357489ab86fd3feac62b2f6ab42ce8899e63 Mon Sep 17 00:00:00 2001
From: Umer Ilyas <umer.ilyas@cowlar.com>
Date: Thu, 6 Feb 2020 19:37:47 +0500
Subject: [PATCH] Client: unlock if subscribe message fails to be created

Closes https://github.com/espressif/esp-mqtt/issues/150
---
 mqtt_client.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mqtt_client.c b/mqtt_client.c
index b50a112..f2f8de0 100644
--- a/mqtt_client.c
+++ b/mqtt_client.c
@@ -1460,6 +1460,7 @@ int esp_mqtt_client_subscribe(esp_mqtt_client_handle_t client, const char *topic
                                           &client->mqtt_state.pending_msg_id);
     if (client->mqtt_state.outbound_message->length == 0) {
         ESP_LOGE(TAG, "Subscribe message cannot be created");
+        MQTT_API_UNLOCK(client);
         return -1;
     }