__intel_shared_reg_put_constraints(struct cpu_hw_events *cpuc,
				   struct hw_perf_event_extra *reg)
{
	struct er_account *era;

	/*
	 * Only put constraint if extra reg was actually allocated. Also takes
	 * care of event which do not use an extra shared reg.
	 *
	 * Also, if this is a fake cpuc we shouldn't touch any event state
	 * (reg->alloc) and we don't care about leaving inconsistent cpuc state
	 * either since it'll be thrown out.
	 */
	if (!reg->alloc || cpuc->is_fake)
		return;

	era = &cpuc->shared_regs->regs[reg->idx];

	/* one fewer user */
	atomic_dec(&era->ref);

	/* allocate again next time */
	reg->alloc = 0;
}

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.