From: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com>
Date: Thu, 11 Aug 2022 09:19:20 +0000 (-0700)
Subject: gh-95876: Fix format string in pegen error location code (GH-95877)
X-Git-Tag: v3.11.0rc2~128
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=1221e8c400933f24be69bd156f03cd1411746e6c;p=thirdparty%2FPython%2Fcpython.git

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

(cherry picked from commit b4c857d0fd74abb1ede6fe083c4fa3ca728b2b83)

Co-authored-by: Christian Heimes <christian@python.org>
---

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
new file mode 100644
index 000000000000..96b69015a586
--- /dev/null
+++ 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
index 5703088443ed..a0f4b9809e21 100644
--- 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;
     }