From 7105e9f3de801ce50e24fcdfbdd450858e28a0fd Mon Sep 17 00:00:00 2001
From: Victor Stinner <victor.stinner@gmail.com>
Date: Tue, 15 Mar 2016 14:28:04 +0100
Subject: [PATCH] _tracemalloc: filename cannot be NULL

---
 Modules/_tracemalloc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Modules/_tracemalloc.c b/Modules/_tracemalloc.c
index d62e68254df..2eb4dcad444 100644
--- a/Modules/_tracemalloc.c
+++ b/Modules/_tracemalloc.c
@@ -65,6 +65,8 @@ __attribute__((packed))
 _declspec(align(4))
 #endif
 {
+    /* filename cannot be NULL: "<unknown>" is used if the Python frame
+       filename is NULL */
     PyObject *filename;
     int lineno;
 } frame_t;
@@ -987,8 +989,6 @@ frame_to_pyobject(frame_t *frame)
     if (frame_obj == NULL)
         return NULL;
 
-    if (frame->filename == NULL)
-        frame->filename = Py_None;
     Py_INCREF(frame->filename);
     PyTuple_SET_ITEM(frame_obj, 0, frame->filename);