nfs: add missing rcu-walk check

Signed-off-by: Nick Piggin <npiggin@kernel.dk>

1 files changed, 5 insertions, 1 deletions

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index d33da530097..a0d8320bed9 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -1410,11 +1410,15 @@ no_open:
 static int nfs_open_revalidate(struct dentry *dentry, struct nameidata *nd)
 {
         struct dentry *parent = NULL;
-        struct inode *inode = dentry->d_inode;
+        struct inode *inode;
         struct inode *dir;
         struct nfs_open_context *ctx;
         int openflags, ret = 0;
 
+        if (nd->flags & LOOKUP_RCU)
+                return -ECHILD;
+
+        inode = dentry->d_inode;
         if (!is_atomic_open(nd) || d_mountpoint(dentry))
                 goto no_open;