static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
{
	struct nfs4_opendata *data = calldata;
	struct nfs4_state_owner *sp = data->owner;

	if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
		return;
	/*
	 * Check if we still need to send an OPEN call, or if we can use
	 * a delegation instead.
	 */
	if (data->state != NULL) {
		struct nfs_delegation *delegation;

		if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
			goto out_no_action;
		rcu_read_lock();
		delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
		if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
		    can_open_delegated(delegation, data->o_arg.fmode))
			goto unlock_no_action;
		rcu_read_unlock();
	}
	/* Update client id. */
	data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
	if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
		task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
		data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
		nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
	}
	data->timestamp = jiffies;
	if (nfs4_setup_sequence(data->o_arg.server,
				&data->o_arg.seq_args,
				&data->o_res.seq_res,
				task) != 0)
		nfs_release_seqid(data->o_arg.seqid);
	else
		rpc_call_start(task);
	return;
unlock_no_action:
	rcu_read_unlock();
out_no_action:
	task->tk_action = NULL;

}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.