static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
		struct inode *new_dir, struct qstr *new_name)
{
	struct nfs_server *server = NFS_SERVER(old_dir);
	struct nfs_renameargs arg = {
		.old_dir = NFS_FH(old_dir),
		.new_dir = NFS_FH(new_dir),
		.old_name = old_name,
		.new_name = new_name,
		.bitmask = server->attr_bitmask,
	};
	struct nfs_renameres res = {
		.server = server,
	};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
		.rpc_argp = &arg,
		.rpc_resp = &res,
	};
	int status = -ENOMEM;
	
	res.old_fattr = nfs_alloc_fattr();
	res.new_fattr = nfs_alloc_fattr();
	if (res.old_fattr == NULL || res.new_fattr == NULL)
		goto out;

	status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
	if (!status) {
		update_changeattr(old_dir, &res.old_cinfo);
		nfs_post_op_update_inode(old_dir, res.old_fattr);
		update_changeattr(new_dir, &res.new_cinfo);
		nfs_post_op_update_inode(new_dir, res.new_fattr);
	}
out:
	nfs_free_fattr(res.new_fattr);
	nfs_free_fattr(res.old_fattr);
	return status;
}

This weakness involves numeric computation errors, such as integer overflows, underflows, or precision losses, which can lead to miscalculations and exploitable behaviors in software.