mufs: check if directory va does not exceed the file size in mufs_readdir()

source/fs/mufs/dir.c

@@ -270,6 +270,9 @@ int mufs_readdir(struct mufs_dir *dir, struct mufs_dirent *dirent)
 
 	dir->va = align_up(dir->va + 1, dir->fs->dev->log2_block_size);
 
+	if (dir->va >= dir->tree->file_size)
+		return -1;
+
 	if ((ret = read_dirent(dir->fs, dir->tree, dirent, dir->va)) > 0) {
 		dir->va += ret;
 		return 0;