From 902a11de9a4b08e799820fb87942cb2171b9e095 Mon Sep 17 00:00:00 2001
From: Far <yesiyuam2@huawei.com>
Date: Tue, 20 Apr 2021 11:43:14 +0800
Subject: [PATCH] fix: lookup new vnode may cause parent vnode freeing

Close #I3MYP4

Change-Id: I533f4bacaf7e6dd500f5ac3ce4f5343b3b885988
---
 fs/vfs/vnode.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/vfs/vnode.c b/fs/vfs/vnode.c
index ddd9c4eb..808c0865 100644
--- a/fs/vfs/vnode.c
+++ b/fs/vfs/vnode.c
@@ -398,6 +398,7 @@ static int Step(char **currentDir, struct Vnode **currentVnode, uint32_t flags)
         goto STEP_FINISH;
     }
 
+    (*currentVnode)->useCount++;
     if (flags & V_DUMMY) {
         ret = ProcessVirtualVnode(*currentVnode, flags, &nextVnode);
     } else {
@@ -407,6 +408,7 @@ static int Step(char **currentDir, struct Vnode **currentVnode, uint32_t flags)
             ret = -ENOSYS;
         }
     }
+    (*currentVnode)->useCount--;
 
     if (ret == LOS_OK) {
         (void)PathCacheAlloc((*currentVnode), nextVnode, nextDir, len);
-- 
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