fix #3653 Python could segfault if invalid values were passed to sys.excepthook
Author: Daniel Diniz
Reviewer: Georg Brandl
diff --git a/Python/pythonrun.c b/Python/pythonrun.c
index a1777bd..1ee062f 100644
--- a/Python/pythonrun.c
+++ b/Python/pythonrun.c
@@ -1300,6 +1300,13 @@
int err = 0;
PyObject *type, *tb;
+ if (!PyExceptionInstance_Check(value)) {
+ PyFile_WriteString("TypeError: print_exception(): Exception expected for value, ", f);
+ PyFile_WriteString(Py_TYPE(value)->tp_name, f);
+ PyFile_WriteString(" found\n", f);
+ return;
+ }
+
Py_INCREF(value);
fflush(stdout);
type = (PyObject *) Py_TYPE(value);