#12278 to_internal_value is called before validation! need to raise v…

…alidation error if incorrect format

netbox/ipam/api/nested_serializers.py

@@ -6,7 +6,7 @@
 from ipam.models.l2vpn import L2VPNTermination, L2VPN
 from ipam.validators import validate_ipaddress_with_mask
 from netbox.api.serializers import WritableNestedSerializer
-from netaddr import IPNetwork
+from netaddr import AddrFormatError, IPNetwork
 
 __all__ = [
     'IPAddressField',
@@ -48,7 +48,12 @@ def __init__(self, **kwargs):
         self.validators.append(validator)
 
     def to_internal_value(self, data):
-        return IPNetwork(data)
+        try:
+            IPNetwork(data)
+        except AddrFormatError:
+            raise serializers.ValidationError("Invalid IP address format: {}".format(data))
+        except (TypeError, ValueError) as e:
+            raise serializers.ValidationError(e)
 
     def to_representation(self, value):
         return str(value)