Index: Lib/test/test_socket.py
===================================================================
--- Lib/test/test_socket.py	(revision 53425)
+++ Lib/test/test_socket.py	(working copy)
@@ -309,6 +309,19 @@
             swapped = func(mask)
             self.assertEqual(swapped & mask, mask)
             self.assertRaises(OverflowError, func, 1L<<34)
+    def testNtoHErrors(self):
+        good_values = [ 1, 2, 3, 1L, 2L, 3L ]
+        bad_values = [ -1, -2, -3, -1L, -2L, -3L ]
+        for k in good_values:
+            socket.ntohl(k)
+            socket.ntohs(k)
+            socket.htonl(k)
+            socket.htons(k)
+        for k in bad_values:
+            self.assertRaises(OverflowError, socket.ntohl, k)
+            self.assertRaises(OverflowError, socket.ntohs, k)
+            self.assertRaises(OverflowError, socket.htonl, k)
+            self.assertRaises(OverflowError, socket.htons, k)
 
     def testGetServBy(self):
         eq = self.assertEqual
Index: Modules/socketmodule.c
===================================================================
--- Modules/socketmodule.c	(revision 53425)
+++ Modules/socketmodule.c	(working copy)
@@ -3468,7 +3468,12 @@
 	if (!PyArg_ParseTuple(args, "i:ntohs", &x1)) {
 		return NULL;
 	}
-	x2 = (int)ntohs((short)x1);
+    if (x1 < 0) {
+        PyErr_SetString(PyExc_OverflowError,
+            "can't convert negative number to unsigned long");
+        return NULL;
+    }
+	x2 = (unsigned int)ntohs((unsigned short)x1);
 	return PyInt_FromLong(x2);
 }
 
@@ -3487,6 +3492,11 @@
 		x = PyInt_AS_LONG(arg);
 		if (x == (unsigned long) -1 && PyErr_Occurred())
 			return NULL;
+        if ((long)x < 0) {
+            PyErr_SetString(PyExc_OverflowError,
+                "can't convert negative number to unsigned long");
+            return NULL;
+        }
 	}
 	else if (PyLong_Check(arg)) {
 		x = PyLong_AsUnsignedLong(arg);
@@ -3510,7 +3520,7 @@
 				    arg->ob_type->tp_name);
 	if (x == (unsigned long) -1 && PyErr_Occurred())
 		return NULL;
-	return PyInt_FromLong(ntohl(x));
+	return PyLong_FromUnsignedLong(ntohl(x));
 }
 
 PyDoc_STRVAR(ntohl_doc,
@@ -3527,7 +3537,12 @@
 	if (!PyArg_ParseTuple(args, "i:htons", &x1)) {
 		return NULL;
 	}
-	x2 = (int)htons((short)x1);
+    if (x1 < 0) {
+        PyErr_SetString(PyExc_OverflowError,
+            "can't convert negative number to unsigned long");
+        return NULL;
+    }
+	x2 = (unsigned int)htons((unsigned short)x1);
 	return PyInt_FromLong(x2);
 }
 
@@ -3546,6 +3561,11 @@
 		x = PyInt_AS_LONG(arg);
 		if (x == (unsigned long) -1 && PyErr_Occurred())
 			return NULL;
+        if ((long)x < 0) {
+            PyErr_SetString(PyExc_OverflowError,
+                "can't convert negative number to unsigned long");
+            return NULL;
+        }
 	}
 	else if (PyLong_Check(arg)) {
 		x = PyLong_AsUnsignedLong(arg);
@@ -3567,7 +3587,7 @@
 		return PyErr_Format(PyExc_TypeError,
 				    "expected int/long, %s found",
 				    arg->ob_type->tp_name);
-	return PyInt_FromLong(htonl(x));
+	return PyLong_FromUnsignedLong(htonl((unsigned long)x));
 }
 
 PyDoc_STRVAR(htonl_doc,