From 59e004af63742361b67d1e1ae70229ff0db1059d Mon Sep 17 00:00:00 2001
From: Zackery Spytz <zspytz@gmail.com>
Date: Sun, 6 Feb 2022 23:40:54 -0800
Subject: [PATCH] bpo-40479: Fix undefined behavior in Modules/_hashopenssl.c
 (GH-31153)

va_end() must be called before returning.
---
 .../Core and Builtins/2022-02-06-23-08-30.bpo-40479.zED3Zu.rst   | 1 +
 Modules/_hashopenssl.c                                           | 1 +
 2 files changed, 2 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Core and Builtins/2022-02-06-23-08-30.bpo-40479.zED3Zu.rst

diff --git a/Misc/NEWS.d/next/Core and Builtins/2022-02-06-23-08-30.bpo-40479.zED3Zu.rst b/Misc/NEWS.d/next/Core and Builtins/2022-02-06-23-08-30.bpo-40479.zED3Zu.rst
new file mode 100644
index 00000000000..52701d53d8f
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2022-02-06-23-08-30.bpo-40479.zED3Zu.rst	
@@ -0,0 +1 @@
+Add a missing call to ``va_end()`` in ``Modules/_hashopenssl.c``.
diff --git a/Modules/_hashopenssl.c b/Modules/_hashopenssl.c
index fb155b2e622..bb9487204e7 100644
--- a/Modules/_hashopenssl.c
+++ b/Modules/_hashopenssl.c
@@ -266,6 +266,7 @@ _setException(PyObject *exc, const char* altmsg, ...)
         } else {
             PyErr_FormatV(exc, altmsg, vargs);
         }
+        va_end(vargs);
         return NULL;
     }
     va_end(vargs);