[3.10] gh-95876: Fix format string in pegen error location code (GH-95877 (GH-95901)

(cherry picked from commit b4c857d)

Co-authored-by: Christian Heimes <[email protected]>

Author: tiran

Misc/NEWS.d/next/Core and Builtins/2022-08-11-09-19-55.gh-issue-95876.YpQfoV.rst

@@ -0,0 +1,4 @@
+Fix format string in ``_PyPegen_raise_error_known_location`` that can lead
+to memory corruption on some 64bit systems. The function was building a
+tuple with ``i`` (int) instead of ``n`` (Py_ssize_t) for Py_ssize_t
+arguments.

Parser/pegen.c

@@ -547,7 +547,7 @@ _PyPegen_raise_error_known_location(Parser *p, PyObject *errtype,
                          byte_offset_to_character_offset(error_line, end_col_offset) :
                          end_col_number;
     }
-    tmp = Py_BuildValue("(OiiNii)", p->tok->filename, lineno, col_number, error_line, end_lineno, end_col_number);
+    tmp = Py_BuildValue("(OnnNnn)", p->tok->filename, lineno, col_number, error_line, end_lineno, end_col_number);
     if (!tmp) {
         goto error;
     }