From b4a2b2799c199fb2955ecaae72e7b7dbe79e593b Mon Sep 17 00:00:00 2001
From: jiangheng <jiangheng14@huawei.com>
Date: Thu, 15 Jun 2023 21:42:04 +0800
Subject: [PATCH] fix null pointer when all zero address listen

---
 src/core/tcp_in.c | 58 ++++++++++++++++++++++++++++-------------------
 1 file changed, 35 insertions(+), 23 deletions(-)

diff --git a/src/core/tcp_in.c b/src/core/tcp_in.c
index 59e854c..d151a96 100644
--- a/src/core/tcp_in.c
+++ b/src/core/tcp_in.c
@@ -114,6 +114,36 @@ static void tcp_remove_sacks_gt(struct tcp_pcb *pcb, u32_t seq);
 #endif /* TCP_OOSEQ_BYTES_LIMIT || TCP_OOSEQ_PBUFS_LIMIT */
 #endif /* LWIP_TCP_SACK_OUT */
 
+#if GAZELLE_TCP_REUSE_IPPORT
+struct tcp_pcb_listen *min_cnts_lpcb_get(struct tcp_pcb_listen *lpcb)
+{
+  struct tcp_pcb_listen *min_cnts_lpcb;
+  struct tcp_pcb_listen *tmp_lpcb = lpcb;
+  u16_t min_conn_num = GAZELLE_TCP_MAX_CONN_PER_THREAD;
+  u8_t have_master_fd = 0;
+
+  while (tmp_lpcb != NULL) {
+    if (tmp_lpcb->master_lpcb) {
+      have_master_fd = 1;
+    }
+    tmp_lpcb = tmp_lpcb->next_same_port_pcb;
+  }
+
+  tmp_lpcb = lpcb;
+  min_cnts_lpcb = lpcb;
+  while (tmp_lpcb != NULL) {
+    if (!have_master_fd || tmp_lpcb->master_lpcb) {
+      if (tmp_lpcb->connect_num < min_conn_num) {
+        min_cnts_lpcb = tmp_lpcb;
+        min_conn_num = tmp_lpcb->connect_num;
+      }
+      tmp_lpcb = tmp_lpcb->next_same_port_pcb;
+    }
+  }
+  return min_cnts_lpcb;
+}
+#endif
+
 /**
  * The initial input processing of TCP. It verifies the TCP header, demultiplexes
  * the segment between the PCBs and passes it on to tcp_process(), which implements
@@ -384,33 +414,15 @@ tcp_input(struct pbuf *p, struct netif *inp)
           if (ip_addr_eq(&lpcb->local_ip, ip_current_dest_addr())) {
             /* found an exact match */
 #if GAZELLE_TCP_REUSE_IPPORT
-            // check master fd
-            struct tcp_pcb_listen *tmp_lpcb = lpcb;
-            u8_t have_master_fd = 0;
-            while (tmp_lpcb != NULL) {
-              if (tmp_lpcb->master_lpcb) {
-	        have_master_fd = 1;
-	      }
-              tmp_lpcb = tmp_lpcb->next_same_port_pcb;
-	    }
-
-            tmp_lpcb = lpcb;
-            min_cnts_lpcb = lpcb;
-            u16_t min_conn_num = GAZELLE_TCP_MAX_CONN_PER_THREAD;
-            while (tmp_lpcb != NULL) {
-              if (!have_master_fd || tmp_lpcb->master_lpcb) {
-                if (tmp_lpcb->connect_num < min_conn_num) {
-                  min_cnts_lpcb = tmp_lpcb;
-		  min_conn_num = tmp_lpcb->connect_num;
-	        }
-	      }
-              tmp_lpcb = tmp_lpcb->next_same_port_pcb;
-	    }
+            min_cnts_lpcb = min_cnts_lpcb_get(lpcb);
 #endif
             break;
           } else if (ip_addr_isany(&lpcb->local_ip)) {
             /* found an ANY-match */
 #if SO_REUSE
+#if GAZELLE_TCP_REUSE_IPPORT
+            min_cnts_lpcb = min_cnts_lpcb_get(lpcb);
+#endif
             lpcb_any = lpcb;
             lpcb_prev = prev;
 #else /* SO_REUSE */
@@ -458,7 +470,7 @@ tcp_input(struct pbuf *p, struct netif *inp)
       {
 #if GAZELLE_TCP_REUSE_IPPORT
         tcp_listen_input(min_cnts_lpcb);
-	min_cnts_lpcb->connect_num++;
+        min_cnts_lpcb->connect_num++;
 #else
         tcp_listen_input(lpcb);
 #endif
-- 
2.27.0