From 6bc793c9b9eb5c409f8c9f36bd4ace3f4299081b Mon Sep 17 00:00:00 2001
From: "Earle F. Philhower, III" <earlephilhower@yahoo.com>
Date: Tue, 21 Oct 2025 13:08:04 -0700
Subject: [PATCH] Fix 60 byte DHCP leak per ::begin

LWIP DHCP needs a separate _cleanup call to free the preallocated DHCP
packet PBUF or it will leak 60 bytes every <Ethernet>::end.  Add the call
on LwipIntfDev::end
---
 libraries/lwIP_Ethernet/src/LwipIntfDev.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libraries/lwIP_Ethernet/src/LwipIntfDev.h b/libraries/lwIP_Ethernet/src/LwipIntfDev.h
index b2afe8898..55c79b93c 100644
--- a/libraries/lwIP_Ethernet/src/LwipIntfDev.h
+++ b/libraries/lwIP_Ethernet/src/LwipIntfDev.h
@@ -463,6 +463,7 @@ void LwipIntfDev<RawDev>::end() {
     if (_started) {
         if (_isDHCP) {
             dhcp_stop(&_netif);
+            dhcp_cleanup(&_netif);
         }
         if (_intrPin < 0) {
             __removeEthernetPacketHandler(_phID);