From 5fb665dbaf57b68656b10ff97411709d995ee558 Mon Sep 17 00:00:00 2001
From: Angus Gratton <angus@espressif.com>
Date: Mon, 23 Jul 2018 16:15:02 +1000
Subject: [PATCH] udp_multicast example: Fix memory leak from getaddrinfo()
 calls

Closes https://github.com/espressif/esp-idf/issues/2201
---
 .../protocols/udp_multicast/main/udp_multicast_example_main.c  | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/examples/protocols/udp_multicast/main/udp_multicast_example_main.c b/examples/protocols/udp_multicast/main/udp_multicast_example_main.c
index 18678d0ea..a8efd1f08 100644
--- a/examples/protocols/udp_multicast/main/udp_multicast_example_main.c
+++ b/examples/protocols/udp_multicast/main/udp_multicast_example_main.c
@@ -506,6 +506,7 @@ static void mcast_example_task(void *pvParameters)
                 ESP_LOGI(TAG, "Sending to IPV6 (V4 mapped) multicast address %s (%s)...",  addrbuf, CONFIG_EXAMPLE_MULTICAST_IPV4_ADDR);
 #endif
                 err = sendto(sock, sendbuf, len, 0, res->ai_addr, res->ai_addrlen);
+                freeaddrinfo(res);
                 if (err < 0) {
                     ESP_LOGE(TAG, "IPV4 sendto failed. errno: %d", errno);
                     break;
@@ -523,12 +524,12 @@ static void mcast_example_task(void *pvParameters)
                     break;
                 }
 
-
                 struct sockaddr_in6 *s6addr = (struct sockaddr_in6 *)res->ai_addr;
                 s6addr->sin6_port = htons(UDP_PORT);
                 inet6_ntoa_r(s6addr->sin6_addr, addrbuf, sizeof(addrbuf)-1);
                 ESP_LOGI(TAG, "Sending to IPV6 multicast address %s...",  addrbuf);
                 err = sendto(sock, sendbuf, len, 0, res->ai_addr, res->ai_addrlen);
+                freeaddrinfo(res);
                 if (err < 0) {
                     ESP_LOGE(TAG, "IPV6 sendto failed. errno: %d", errno);
                     break;