local_host_ip_addrs_to_string: fix buffer overflow

HISTORY

@@ -1,4 +1,7 @@
 
+Version 1.88  2026-09-03
+ * local_host_ip_addrs_to_string: fix buffer overflow
+
 Version 1.87  2026-07-10
  * ini_file_readers can refer env variable such as %{env::FASTDFS_IPADDR}
 

doc/ini_file_reader-Chinese.md

@@ -10,7 +10,7 @@ libfastcommon是在github开源的⼀个C函数库。它提供了ini⽂件解析
 ## ini_file_reader的主要特点：
 
 ### 1、⽀持section
-例如: 
+例如:
 ```
 [workers]
 threads = 4

src/local_ip_func.c

@@ -70,12 +70,21 @@ const char *local_host_ip_addrs_to_string(char *buff, const int size)
 
 	len = snprintf(buff, size, "local_host_ip_count: %d,",
             g_local_host_ip_count);
+    if (len >= size)
+    {
+        return buff;
+    }
+
 	pEnd = g_local_host_ip_addrs +
 		IP_ADDRESS_SIZE * g_local_host_ip_count;
 	for (p=g_local_host_ip_addrs; p<pEnd; p+=IP_ADDRESS_SIZE)
-	{
-		len += snprintf(buff + len, size - len, "  %s", p);
-	}
+    {
+        len += snprintf(buff + len, size - len, "  %s", p);
+        if (len >= size)
+        {
+            break;
+        }
+    }
 
     return buff;
 }