Handle non-string input for IP fields (#4338)

rest_framework/fields.py

@@ -804,7 +804,10 @@ class IPAddressField(CharField):
         self.validators.extend(validators)
 
     def to_internal_value(self, data):
-        if data and ':' in data:
+        if not isinstance(data, six.string_types):
+            self.fail('invalid', value=data)
+
+        if ':' in data:
             try:
                 if self.protocol in ('both', 'ipv6'):
                     return clean_ipv6_address(data, self.unpack_ipv4)

tests/test_fields.py

@@ -663,6 +663,7 @@ class TestIPAddressField(FieldValues):
         '127.122.111.2231': ['Enter a valid IPv4 or IPv6 address.'],
         '2001:::9652': ['Enter a valid IPv4 or IPv6 address.'],
         '2001:0db8:85a3:0042:1000:8a2e:0370:73341': ['Enter a valid IPv4 or IPv6 address.'],
+        1000: ['Enter a valid IPv4 or IPv6 address.'],
     }
     outputs = {}
     field = serializers.IPAddressField()