1 files changed, 9 insertions, 2 deletions

diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index fa517ae9207f..2426e713b77f 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -1054,10 +1054,11 @@ static int nfs_validate_mount_data(void *options,
 {
         struct nfs_mount_data *data = (struct nfs_mount_data *)options;
 
+        memset(args, 0, sizeof(*args));
+
         if (data == NULL)
                 goto out_no_data;
 
-        memset(args, 0, sizeof(*args));
         args->flags             = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
         args->rsize             = NFS_MAX_FILE_IO_SIZE;
         args->wsize             = NFS_MAX_FILE_IO_SIZE;
@@ -1474,6 +1475,11 @@ static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
                 error = PTR_ERR(mntroot);
                 goto error_splat_super;
         }
+        if (mntroot->d_inode->i_op != &nfs_dir_inode_operations) {
+                dput(mntroot);
+                error = -ESTALE;
+                goto error_splat_super;
+        }
 
         s->s_flags |= MS_ACTIVE;
         mnt->mnt_sb = s;
@@ -1531,10 +1537,11 @@ static int nfs4_validate_mount_data(void *options,
         struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
         char *c;
 
+        memset(args, 0, sizeof(*args));
+
         if (data == NULL)
                 goto out_no_data;
 
-        memset(args, 0, sizeof(*args));
         args->rsize             = NFS_MAX_FILE_IO_SIZE;
         args->wsize             = NFS_MAX_FILE_IO_SIZE;
         args->timeo             = 600;