From a3b1caf952717fc79a589a870a0caf50538bc76d Mon Sep 17 00:00:00 2001
From: Meco Man <920369182@qq.com>
Date: Sat, 12 Jun 2021 16:08:22 +0800
Subject: [PATCH] =?UTF-8?q?[example]=20=E8=A7=A3=E5=86=B3=E6=BD=9C?=
 =?UTF-8?q?=E5=9C=A8=E5=86=85=E5=AD=98=E6=B3=84=E6=BC=8F=E9=97=AE=E9=A2=98?=
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---
 examples/file/listdir.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/examples/file/listdir.c b/examples/file/listdir.c
index 98fbc5ea2..06c746a64 100644
--- a/examples/file/listdir.c
+++ b/examples/file/listdir.c
@@ -13,7 +13,7 @@
 
 void list_dir(const char* path)
 {
-    char * fullpath;
+    char * fullpath = RT_NULL;
     DIR *dir;
 
     dir = opendir(path);
@@ -57,7 +57,10 @@ void list_dir(const char* path)
         rt_kprintf("open %s directory failed\n", path);
     }
 
-    rt_free(fullpath);
+    if (RT_NULL != fullpath)
+    {
+        rt_free(fullpath);
+    }
 }
 
 #ifdef RT_USING_FINSH
@@ -80,6 +83,6 @@ static void cmd_list_dir(int argc, char *argv[])
     }
     list_dir(filename);
 }
-FINSH_FUNCTION_EXPORT_ALIAS(cmd_list_dir, __cmd_list_dir, list directory);
+MSH_CMD_EXPORT_ALIAS(cmd_list_dir, list_dir, list directory);
 #endif /* FINSH_USING_MSH */
 #endif /* RT_USING_FINSH */
-- 
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