commit 40d736bcf40c10aa5fc7d6cc305a6641afd3cd0e
author Oren Milman <orenmn@gmail.com> Sat Sep 30 17:06:55 2017 +0300
committer Serhiy Storchaka <storchaka@gmail.com> Sat Sep 30 17:06:55 2017 +0300
tree 8f8bb3be3e68b9e00f41b636d91051b01ef309bf
parent 8b83687bdf66d2d10afb78e46bcede399deaefde

[2.7] bpo-31285: Don't raise a SystemError in warnings.warn_explicit() in case __loader__.get_source() has a bad splitlines() method. (GH-3219) (#3823)

(cherry picked from commit 91fb0af)

Python/_warnings.c

diff --git a/Python/_warnings.c b/Python/_warnings.c
index dd168f9..37875e5 100644
--- a/Python/_warnings.c
+++ b/Python/_warnings.c
@@ -684,8 +684,9 @@
         }
 
         /* Split the source into lines. */
-        source_list = PyObject_CallMethodObjArgs(source, splitlines_name,
-                                                    NULL);
+        source_list = PyObject_CallMethodObjArgs((PyObject *)&PyString_Type,
+                                                 splitlines_name, source,
+                                                 NULL);
         Py_DECREF(source);
         if (!source_list)
             return NULL;