diff --git a/Objects/exceptions.c b/Objects/exceptions.c
index cbcda7b..9655733 100644
--- a/Objects/exceptions.c
+++ b/Objects/exceptions.c
@@ -929,6 +929,10 @@
 {
     int have_lineno = 0;
     char *filename = 0;
+    /* Below, we always ignore overflow errors, just printing -1.
+       Still, we cannot allow an OverflowError to be raised, so
+       we need to call PyLong_AsLongAndOverflow. */
+    int overflow;
 
     /* XXX -- do all the additional formatting with filename and
        lineno here */
@@ -936,7 +940,7 @@
     if (self->filename && PyUnicode_Check(self->filename)) {
 	    filename = PyUnicode_AsString(self->filename);
     }
-    have_lineno = (self->lineno != NULL) && PyInt_CheckExact(self->lineno);
+    have_lineno = (self->lineno != NULL) && PyLong_CheckExact(self->lineno);
 
     if (!filename && !have_lineno)
         return PyObject_Str(self->msg ? self->msg : Py_None);
@@ -945,7 +949,7 @@
         return PyUnicode_FromFormat("%S (%s, line %ld)",
                    self->msg ? self->msg : Py_None,
                    my_basename(filename),
-                   PyLong_AsLong(self->lineno));
+		   PyLong_AsLongAndOverflow(self->lineno, &overflow));
     else if (filename)
         return PyUnicode_FromFormat("%S (%s)",
                    self->msg ? self->msg : Py_None,
@@ -953,7 +957,7 @@
     else /* only have_lineno */
         return PyUnicode_FromFormat("%S (line %ld)",
                    self->msg ? self->msg : Py_None,
-                   PyLong_AsLong(self->lineno));
+                   PyLong_AsLongAndOverflow(self->lineno, &overflow));
 }
 
 static PyMemberDef SyntaxError_members[] = {
diff --git a/Objects/frameobject.c b/Objects/frameobject.c
index 0e6d9f8..266cbd2 100644
--- a/Objects/frameobject.c
+++ b/Objects/frameobject.c
@@ -66,6 +66,8 @@
 frame_setlineno(PyFrameObject *f, PyObject* p_new_lineno)
 {
 	int new_lineno = 0;		/* The new value of f_lineno */
+	long l_new_lineno;
+	int overflow;
 	int new_lasti = 0;		/* The new value of f_lasti */
 	int new_iblock = 0;		/* The new value of f_iblock */
 	unsigned char *code = NULL;	/* The bytecode for the frame... */
@@ -88,7 +90,7 @@
 	unsigned char setup_op = 0;	/* (ditto) */
 
 	/* f_lineno must be an integer. */
-	if (!PyInt_CheckExact(p_new_lineno)) {
+	if (!PyLong_CheckExact(p_new_lineno)) {
 		PyErr_SetString(PyExc_ValueError,
 				"lineno must be an integer");
 		return -1;
@@ -104,7 +106,19 @@
 	}
 
 	/* Fail if the line comes before the start of the code block. */
-	new_lineno = (int) PyLong_AsLong(p_new_lineno);
+	l_new_lineno = PyLong_AsLongAndOverflow(p_new_lineno, &overflow);
+	if (overflow
+#if SIZEOF_LONG > SIZEOF_INT
+	    || l_new_lineno > INT_MAX
+	    || l_new_lineno < INT_MIN
+#endif
+	   ) {
+		PyErr_SetString(PyExc_ValueError,
+				"lineno out of range");
+		return -1;
+	}
+	new_lineno = (int)l_new_lineno;
+	    
 	if (new_lineno < f->f_code->co_firstlineno) {
 		PyErr_Format(PyExc_ValueError,
 			     "line %d comes before the current code block",
diff --git a/Objects/listobject.c b/Objects/listobject.c
index 59674bf..18d3b90 100644
--- a/Objects/listobject.c
+++ b/Objects/listobject.c
@@ -925,7 +925,7 @@
 	Py_DECREF(args);
 	if (res == NULL)
 		return -1;
-	if (!PyInt_CheckExact(res)) {
+	if (!PyLong_CheckExact(res)) {
 		PyErr_Format(PyExc_TypeError,
 			     "comparison function must return int, not %.200s",
 			     res->ob_type->tp_name);
@@ -934,6 +934,10 @@
 	}
 	i = PyLong_AsLong(res);
 	Py_DECREF(res);
+	if (i == -1 && PyErr_Occurred()) {
+		/* Overflow in long conversion. */
+		return -1;
+	}
 	return i < 0;
 }
 
diff --git a/Objects/longobject.c b/Objects/longobject.c
index 1e20485..cf7cb47 100644
--- a/Objects/longobject.c
+++ b/Objects/longobject.c
@@ -299,7 +299,7 @@
    Returns -1 and sets an error condition if overflow occurs. */
 
 long
-PyLong_AsLong(PyObject *vv)
+PyLong_AsLongAndOverflow(PyObject *vv, int *overflow)
 {
 	/* This version by Tim Peters */
 	register PyLongObject *v;
@@ -309,6 +309,7 @@
 	int sign;
 	int do_decref = 0; /* if nb_int was called */
 
+	*overflow = 0;
 	if (vv == NULL) {
 		PyErr_BadInternalCall();
 		return -1;
@@ -358,8 +359,7 @@
 			prev = x;
 			x = (x << PyLong_SHIFT) + v->ob_digit[i];
 			if ((x >> PyLong_SHIFT) != prev) {
-				PyErr_SetString(PyExc_OverflowError,
-					"Python int too large to convert to C long");
+				*overflow = Py_Size(v) > 0 ? 1 : -1;
 				goto exit;
 			}
 		}
@@ -373,8 +373,8 @@
 			res = LONG_MIN;
 		}
 		else {
-			PyErr_SetString(PyExc_OverflowError,
-				"Python int too large to convert to C long");
+			*overflow = Py_Size(v) > 0 ? 1 : -1;
+			/* res is already set to -1 */
 		}	
 	}
  exit:
@@ -384,6 +384,20 @@
 	return res;
 }
 
+long 
+PyLong_AsLong(PyObject *obj)
+{
+	int overflow;
+	long result = PyLong_AsLongAndOverflow(obj, &overflow);
+	if (overflow) {
+		/* XXX: could be cute and give a different 
+		   message for overflow == -1 */
+		PyErr_SetString(PyExc_OverflowError,
+				"Python int too large to convert to C long");
+	}
+	return result;
+}
+
 int
 _PyLong_FitsInLong(PyObject *vv)
 {