[2.7] bpo-38540: Fix possible leak in PyArg_Parse for "es#" and "et#". (GH-16869). (GH-16877)

(cherry picked from commit 5bc6a7c)

Author: serhiy-storchaka

Misc/NEWS.d/next/C API/2019-10-21-09-24-03.bpo-38540.314N_T.rst

@@ -0,0 +1,3 @@
+Fixed possible leak in :c:func:`PyArg_Parse` and similar functions for
+format units ``"es#"`` and ``"et#"`` when the macro
+:c:macro:`PY_SSIZE_T_CLEAN` is not defined.

Python/getargs.c

@@ -1156,7 +1156,19 @@ convertsimple(PyObject *arg, const char **p_format, va_list *p_va, int flags,
  memcpy(*buffer,
  PyString_AS_STRING(s),
  size + 1);
- STORE_SIZE(size);
+
+ if (flags & FLAG_SIZE_T) {
+ *q2 = size;
+ }
+ else {
+ if (INT_MAX < size) {
+ Py_DECREF(s);
+ PyErr_SetString(PyExc_OverflowError,
+ "size does not fit in an int");
+ return converterr("", arg, msgbuf, bufsize);
+ }
+ *q = (int)size;
+ }
  } else {
  /* Using a 0-terminated buffer: