From: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com>
Date: Mon, 12 Jan 2026 16:02:23 +0000 (+0100)
Subject: [3.13] gh-143544: Fix possible use-after-free in the JSON decoder when JSONDecodeErro... 
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8b7ebbb43217362f7fb61f6a4cf3f90e3e0c8880;p=thirdparty%2FPython%2Fcpython.git

[3.13] gh-143544: Fix possible use-after-free in the JSON decoder when JSONDecodeError disappears during raising it (GH-143561) (#143734)

gh-143544: Fix possible use-after-free in the JSON decoder when JSONDecodeError disappears during raising it (GH-143561)
(cherry picked from commit c3157480601499565fd42a8afbdb0207328ac484)

Co-authored-by: VanshAgarwal24036 <148854295+VanshAgarwal24036@users.noreply.github.com>
Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
---

diff --git a/Modules/_json.c b/Modules/_json.c
index cc41b9ab867a..afefc71bfbdd 100644
--- a/Modules/_json.c
+++ b/Modules/_json.c
@@ -308,11 +308,12 @@ raise_errmsg(const char *msg, PyObject *s, Py_ssize_t end)
 
     PyObject *exc;
     exc = PyObject_CallFunction(JSONDecodeError, "zOn", msg, s, end);
-    Py_DECREF(JSONDecodeError);
     if (exc) {
         PyErr_SetObject(JSONDecodeError, exc);
         Py_DECREF(exc);
     }
+
+    Py_DECREF(JSONDecodeError);
 }
 
 static void