From 51efec1a0601bbcae93a0e6af8ba1ccca619b4ef Mon Sep 17 00:00:00 2001
From: xieyangrun <xieyangrun@rt-thread.com>
Date: Tue, 8 Nov 2022 19:58:43 +0800
Subject: [PATCH] fixed dfs_normalize_path. ls failure because cd ../xx on the
 /.

---
 components/dfs/src/dfs.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/components/dfs/src/dfs.c b/components/dfs/src/dfs.c
index bfe9942f47..71ebc0b197 100644
--- a/components/dfs/src/dfs.c
+++ b/components/dfs/src/dfs.c
@@ -655,11 +655,16 @@ char *dfs_normalize_path(const char *directory, const char *filename)
         continue;
 
 up_one:
-        dst--;
-        if (dst < dst0)
+        /* keep the topmost root directory */
+        if (dst - dst0 != 1 || dst[-1] != '/')
         {
-            rt_free(fullpath);
-            return NULL;
+            dst--;
+
+            if (dst < dst0)
+            {
+                rt_free(fullpath);
+                return NULL;
+            }
         }
         while (dst0 < dst && dst[-1] != '/')
             dst--;
-- 
Gitee