diff -r fc5d2f4291ac Python/getargs.c
--- a/Python/getargs.c	Fri May 04 02:31:57 2012 -0700
+++ b/Python/getargs.c	Fri May 04 17:34:27 2012 +0300
@@ -4,6 +4,7 @@
 #include "Python.h"
 
 #include <ctype.h>
+#include <float.h>
 
 
 #ifdef __cplusplus
@@ -757,8 +758,19 @@
         double dval = PyFloat_AsDouble(arg);
         if (PyErr_Occurred())
             RETURN_ERR_OCCURRED;
-        else
-            *p = (float) dval;
+        if (Py_IS_FINITE(dval)) {
+            if (dval < -FLT_MAX) {
+                PyErr_SetString(PyExc_OverflowError,
+                                "float is less than minimum");
+                RETURN_ERR_OCCURRED;
+            }
+            else if (dval > FLT_MAX) {
+                PyErr_SetString(PyExc_OverflowError,
+                                "float is greater than maximum");
+                RETURN_ERR_OCCURRED;
+            }
+        }
+        *p = (float) dval;
         break;
     }