From 3101ba8ac88b5f4775485268bc8c041fe7f7e783 Mon Sep 17 00:00:00 2001
From: bernard <bernard.xiong@rt-thread.com>
Date: Tue, 6 Jun 2017 18:19:32 +0800
Subject: [PATCH] [DFS] Add fd checking in dfs_file_close API.

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

diff --git a/components/dfs/src/dfs_file.c b/components/dfs/src/dfs_file.c
index 1085a3635a..27ab52f64c 100644
--- a/components/dfs/src/dfs_file.c
+++ b/components/dfs/src/dfs_file.c
@@ -136,6 +136,9 @@ int dfs_file_close(struct dfs_fd *fd)
 {
     int result = 0;
 
+    if (fd == RT_NULL)
+        return -DFS_STATUS_ENXIO;
+
     if (fd != RT_NULL && fd->fs->ops->close != RT_NULL)
         result = fd->fs->ops->close(fd);
 
@@ -568,6 +571,7 @@ void rm(const char *filename)
     }
 }
 FINSH_FUNCTION_EXPORT(rm, remove files or directories);
+
 void cat(const char* filename)
 {
     rt_uint32_t length;