From 4e7a69bdb63a104587759d7784124492dcdd496e Mon Sep 17 00:00:00 2001
From: Mark Shannon <mark@hotpy.org>
Date: Wed, 2 Dec 2020 13:30:55 +0000
Subject: bpo-42500: Fix recursion in or after except (GH-23568)

* Use counter, rather boolean state when handling soft overflows.
---
 Python/errors.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'Python/errors.c')

diff --git a/Python/errors.c b/Python/errors.c
index f80ae21fdd..8242ac6978 100644
--- a/Python/errors.c
+++ b/Python/errors.c
@@ -290,12 +290,14 @@ _PyErr_NormalizeException(PyThreadState *tstate, PyObject **exc,
                           PyObject **val, PyObject **tb)
 {
     int recursion_depth = 0;
+    tstate->recursion_headroom++;
     PyObject *type, *value, *initial_tb;
 
   restart:
     type = *exc;
     if (type == NULL) {
         /* There was no exception, so nothing to do. */
+        tstate->recursion_headroom--;
         return;
     }
 
@@ -347,6 +349,7 @@ _PyErr_NormalizeException(PyThreadState *tstate, PyObject **exc,
     }
     *exc = type;
     *val = value;
+    tstate->recursion_headroom--;
     return;
 
   error:
-- 
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