sort.Strings(icpTags)
		// capture latest revision installed for comparison
		for _, val := range icpTags {
			if val != "" {
				icpTag = val
			}
		}
		// when the revision is passed
		if icpTag != "" && tag != icpTag {
			check := "         Before upgrading, you may wish to use 'istioctl x precheck' to check for upgrade warnings.\n"

				return nil, nil, nil, nil, fmt.Errorf("x509: invalid NameConstraints extension")
			}

			var (
				dnsTag   = cryptobyte_asn1.Tag(2).ContextSpecific()
				emailTag = cryptobyte_asn1.Tag(1).ContextSpecific()
				ipTag    = cryptobyte_asn1.Tag(7).ContextSpecific()
				uriTag   = cryptobyte_asn1.Tag(6).ContextSpecific()
			)

			switch tag {
			case dnsTag:
				domain := string(value)