From 07b1c4c8a736a31ac4b8ae13ea25d50793dfea83 Mon Sep 17 00:00:00 2001
From: Mike Gorse <mgorse@alum.wpi.edu>
Date: Fri, 25 Jan 2019 12:55:52 -0600
Subject: [PATCH] python: return None if PY_IMPORT_STRING returns NULL

PY_IMPORT_STRING might return NULL on python 3 if, ie, a string can't be
encoded. We should check for this and return None, rather than returning
NULL. Fixes a NULL pointer dereference when reporting an error with an
invalid string.
---
 python/types.c |    4 ++++
 1 file changed, 4 insertions(+)

Index: libxml2-2.10.3/python/types.c
===================================================================
--- libxml2-2.10.3.orig/python/types.c
+++ libxml2-2.10.3/python/types.c
@@ -274,6 +274,10 @@ libxml_charPtrConstWrap(const char *str)
         return (Py_None);
     }
     ret = PY_IMPORT_STRING(str);
+    if (ret == NULL) {
+        Py_INCREF(Py_None);
+        return (Py_None);
+    }
     return (ret);
 }