From e8c46a566b6010ed936115c12c3ce720cac3eff3 Mon Sep 17 00:00:00 2001
From: yuanjm <yuanjianmin@espressif.com>
Date: Mon, 21 Jun 2021 14:37:21 +0800
Subject: [PATCH] sntp: Fix client receive KOD packet that make pool
 MEMP_SYS_TIMEOUT not be freed

Reported as https://savannah.nongnu.org/bugs/?58817
picked from espressif/esp-lwip@1c1642fe
Ref IDF-4847
---
 src/apps/sntp/sntp.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/apps/sntp/sntp.c b/src/apps/sntp/sntp.c
index 23731e51..b79783a7 100644
--- a/src/apps/sntp/sntp.c
+++ b/src/apps/sntp/sntp.c
@@ -528,6 +528,7 @@ sntp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *addr,
     /* KOD errors are only processed in case of an explicit poll response */
     if (sntp_opmode == SNTP_OPMODE_POLL) {
       /* Kiss-of-death packet. Use another server or increase UPDATE_DELAY. */
+      sys_untimeout(sntp_request, NULL);
       sntp_try_next_server(NULL);
     }
   } else {