static void m_stop(struct seq_file *m, void *v)
{
 	struct proc_maps_private *priv = m->private;
 	struct vm_area_struct *vma = v;
 
	vma_stop(priv, vma);
 	if (priv->task)
 		put_task_struct(priv->task);
 }

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.