1 files changed, 12 insertions, 0 deletions
diff --git a/Modules/timemodule.c b/Modules/timemodule.c
index 197d2c0..55e26fa 100644
--- a/Modules/timemodule.c
+++ b/Modules/timemodule.c
@@ -623,6 +623,12 @@ time_strftime(PyObject *self, PyObject *args)
             Py_DECREF(format);
             return NULL;
         }
+        else if (outbuf[1] == '\0')
+        {
+            PyErr_SetString(PyExc_ValueError, "Incomplete format string");
+            Py_DECREF(format);
+            return NULL;
+        }
     }
 #elif (defined(_AIX) || defined(sun)) && defined(HAVE_WCSFTIME)
     for(outbuf = wcschr(fmt, '%');
@@ -636,6 +642,12 @@ time_strftime(PyObject *self, PyObject *args)
                             "format %y requires year >= 1900 on AIX");
             return NULL;
         }
+        else if (outbuf[1] == '\0')
+        {
+            PyErr_SetString(PyExc_ValueError, "Incomplete format string");
+            Py_DECREF(format);
+            return NULL;
+        }
     }
 #endif