From eaef3a2683ab2fb7cdc69fb5910f23944f1b463c Mon Sep 17 00:00:00 2001
From: zhangyanjiao <zhangyanjiao@espressif.com>
Date: Tue, 21 May 2024 17:02:55 +0800
Subject: [PATCH] fix(lwip): fixed the dhcp pool error on dhcp server

---
 components/lwip/apps/dhcpserver/dhcpserver.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/components/lwip/apps/dhcpserver/dhcpserver.c b/components/lwip/apps/dhcpserver/dhcpserver.c
index b9facd99b3..e6abfd743c 100644
--- a/components/lwip/apps/dhcpserver/dhcpserver.c
+++ b/components/lwip/apps/dhcpserver/dhcpserver.c
@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2015-2023 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2015-2024 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -1424,7 +1424,7 @@ static void kill_oldest_dhcps_pool(dhcps_t *dhcps)
     assert(pre != NULL && pre->pnext != NULL); // Expect the list to have at least 2 nodes
     p = pre->pnext;
     minpre = pre;
-    minp = p;
+    minp = pre;
 
     while (p != NULL) {
         pdhcps_pool = p->pnode;
@@ -1438,8 +1438,11 @@ static void kill_oldest_dhcps_pool(dhcps_t *dhcps)
         pre = p;
         p = p->pnext;
     }
-
-    minpre->pnext = minp->pnext;
+    if (minp == dhcps->plist) {
+        dhcps->plist = minp->pnext;
+    } else {
+        minpre->pnext = minp->pnext;
+    }
     free(minp->pnode);
     minp->pnode = NULL;
     free(minp);