intel_shared_regs_constraints(struct cpu_hw_events *cpuc,
			      struct perf_event *event)
{
	struct event_constraint *c = NULL, *d;
	struct hw_perf_event_extra *xreg, *breg;

	xreg = &event->hw.extra_reg;
	if (xreg->idx != EXTRA_REG_NONE) {
		c = __intel_shared_reg_get_constraints(cpuc, event, xreg);
		if (c == &emptyconstraint)
			return c;
	}
	breg = &event->hw.branch_reg;
	if (breg->idx != EXTRA_REG_NONE) {
		d = __intel_shared_reg_get_constraints(cpuc, event, breg);
		if (d == &emptyconstraint) {
			__intel_shared_reg_put_constraints(cpuc, xreg);
			c = d;
		}
	}
	return c;
}

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.