pythongh-95876: Fix format string in pegen error location code (pytho…

…n#95877)
tiran · Aug 11, 2022 · b4c857d · b4c857d
1 parent 5ed584c
commit b4c857d
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diff --git a/Misc/NEWS.d/next/Core and Builtins/2022-08-11-09-19-55.gh-issue-95876.YpQfoV.rst b/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.
diff --git a/Parser/pegen_errors.c b/Parser/pegen_errors.c
@@ -371,7 +371,7 @@ _PyPegen_raise_error_known_location(Parser *p, PyObject *errtype,
             }
         }
     }
-    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;
     }