UBIFS: Fix possible memory leak in ubifs_readdir()

commit aeeb14f7 upstream.

If ubifs_tnc_next_ent() returns something else than -ENOENT
we leak file->private_data.
Signed-off-by: Richard Weinberger <richard@nod.at>
Reviewed-by: David Gstir <david@sigma-star.at>
Signed-off-by: Willy Tarreau <w@1wt.eu>

fs/ubifs/dir.c

@@ -467,13 +467,14 @@ static int ubifs_readdir(struct file *file, void *dirent, filldir_t filldir)
 	}
 
 out:
+	kfree(file->private_data);
+	file->private_data = NULL;
+
 	if (err != -ENOENT) {
 		ubifs_err("cannot find next direntry, error %d", err);
 		return err;
 	}
 
-	kfree(file->private_data);
-	file->private_data = NULL;
 	/* 2 is a special value indicating that there are no more direntries */
 	file->f_pos = 2;
 	return 0;