From 0bad4d63c654d93e1f32ff35026405a3987db5ca Mon Sep 17 00:00:00 2001
From: Yury Selivanov <yury@magic.io>
Date: Tue, 23 Jan 2018 16:26:07 -0500
Subject: [PATCH] bpo-32436: Fix potential NULL dereference (#5286)

---
 Python/hamt.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Python/hamt.c b/Python/hamt.c
index eb69fdd136b..af3dfce43c8 100644
--- a/Python/hamt.c
+++ b/Python/hamt.c
@@ -1055,6 +1055,10 @@ hamt_node_bitmap_without(PyHamtNode_Bitmap *self,
 #endif
 
                 PyHamtNode_Bitmap *clone = hamt_node_bitmap_clone(self);
+                if (clone == NULL) {
+                    return W_ERROR;
+                }
+
                 Py_SETREF(clone->b_array[val_idx],
                           (PyObject *)sub_node);  /* borrow */