From 76a64ca4388493c8b518a256e3cc0e9b5ed3b3f3 Mon Sep 17 00:00:00 2001
From: Serhiy Storchaka <storchaka@gmail.com>
Date: Sun, 26 Jul 2015 09:07:53 +0300
Subject: Issue #24683: Fixed a crash in _json.make_encoder() called with
 non-dict 1st argument.

---
 Modules/_json.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Modules/_json.c b/Modules/_json.c
index 121126d..5dac038 100644
--- a/Modules/_json.c
+++ b/Modules/_json.c
@@ -1850,6 +1850,13 @@ encoder_init(PyObject *self, PyObject *args, PyObject *kwds)
     if (allow_nan < 0)
         return -1;
 
+    if (markers != Py_None && !PyDict_Check(markers)) {
+        PyErr_Format(PyExc_TypeError,
+                     "make_encoder() argument 1 must be dict or None, "
+                     "not %.200s", Py_TYPE(markers)->tp_name);
+        return -1;
+    }
+
     s->markers = markers;
     s->defaultfn = defaultfn;
     s->encoder = encoder;
-- 
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