From 56c0df1e58a231750ebfbc93401a4b6f42f99ffb Mon Sep 17 00:00:00 2001
From: shaojinchun <shaojinchun@rt-thread.com>
Date: Mon, 10 Dec 2018 08:33:17 +0800
Subject: 修正dfs在fd_get时，未检查有效性的问题
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---
 components/dfs/src/dfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/components/dfs/src/dfs.c b/components/dfs/src/dfs.c
index 38a1813421..cf0b2b0ef9 100644
--- a/components/dfs/src/dfs.c
+++ b/components/dfs/src/dfs.c
@@ -221,7 +221,7 @@ struct dfs_fd *fd_get(int fd)
     d = fdt->fds[fd];
 
     /* check dfs_fd valid or not */
-    if (d->magic != DFS_FD_MAGIC)
+    if ((d == NULL) || (d->magic != DFS_FD_MAGIC))
     {
         dfs_unlock();
         return NULL;
-- 
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