ProcRenderDispatch (ClientPtr client)
{
    REQUEST(xReq);
    
    if (stuff->data < RenderNumberRequests)
	return (*ProcRenderVector[stuff->data]) (client);
    else
	return BadRequest;
}

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.