From 5ec809bfc71b600dcfa1d3ad46183cd4135a42fc Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@python.org>
Date: Wed, 18 Mar 2026 18:27:52 +0100
Subject: [PATCH] gh-146092: Handle _PyFrame_GetFrameObject() failures properly
 (#146124)

* Fix _PyFrame_GetLocals() and _PyFrame_GetLocals() error handling.
* _PyEval_ExceptionGroupMatch() now fails on _PyFrame_GetLocals()
  error.

(cherry picked from commit e1e4852133ea548479bc9b975420a32331df7cee)
---
 Objects/frameobject.c |  3 +++
 Python/ceval.c        | 22 +++++++++++++++-------
 2 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/Objects/frameobject.c b/Objects/frameobject.c
index 7c2773085f4b85..51d3e6c8d31719 100644
--- a/Objects/frameobject.c
+++ b/Objects/frameobject.c
@@ -2288,6 +2288,9 @@ _PyFrame_GetLocals(_PyInterpreterFrame *frame)
     }
 
     PyFrameObject* f = _PyFrame_GetFrameObject(frame);
+    if (f == NULL) {
+        return NULL;
+    }
 
     return _PyFrameLocalsProxy_New(f);
 }
diff --git a/Python/ceval.c b/Python/ceval.c
index e6d82f249ef550..b48939c0547b16 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -2293,14 +2293,17 @@ _PyEval_ExceptionGroupMatch(_PyInterpreterFrame *frame, PyObject* exc_value,
                 return -1;
             }
             PyFrameObject *f = _PyFrame_GetFrameObject(frame);
-            if (f != NULL) {
-                PyObject *tb = _PyTraceBack_FromFrame(NULL, f);
-                if (tb == NULL) {
-                    return -1;
-                }
-                PyException_SetTraceback(wrapped, tb);
-                Py_DECREF(tb);
+            if (f == NULL) {
+                Py_DECREF(wrapped);
+                return -1;
+            }
+
+            PyObject *tb = _PyTraceBack_FromFrame(NULL, f);
+            if (tb == NULL) {
+                return -1;
             }
+            PyException_SetTraceback(wrapped, tb);
+            Py_DECREF(tb);
             *match = wrapped;
         }
         *rest = Py_NewRef(Py_None);
@@ -2778,6 +2781,11 @@ PyEval_GetLocals(void)
 
     if (PyFrameLocalsProxy_Check(locals)) {
         PyFrameObject *f = _PyFrame_GetFrameObject(current_frame);
+        if (f == NULL) {
+            Py_DECREF(locals);
+            return NULL;
+        }
+
         PyObject *ret = f->f_locals_cache;
         if (ret == NULL) {
             ret = PyDict_New();