Issue #18408: Add a new PyFrame_FastToLocalsWithError() function to handle

exceptions when merging fast locals into f_locals of a frame.
PyEval_GetLocals() now raises an exception and return NULL on failure.

1 files changed, 5 insertions, 2 deletions

diff --git a/Python/sysmodule.c b/Python/sysmodule.c
index d8848ae977..97ce0594b5 100644
--- a/Python/sysmodule.c
+++ b/Python/sysmodule.c
@@ -332,12 +332,16 @@ static PyObject *
 call_trampoline(PyThreadState *tstate, PyObject* callback,
                 PyFrameObject *frame, int what, PyObject *arg)
 {
-    PyObject *args = PyTuple_New(3);
+    PyObject *args;
     PyObject *whatstr;
     PyObject *result;
 
+    args = PyTuple_New(3);
     if (args == NULL)
         return NULL;
+    if (PyFrame_FastToLocalsWithError(frame) < 0)
+        return NULL;
+
     Py_INCREF(frame);
     whatstr = whatstrings[what];
     Py_INCREF(whatstr);
@@ -349,7 +353,6 @@ call_trampoline(PyThreadState *tstate, PyObject* callback,
     PyTuple_SET_ITEM(args, 2, arg);
 
     /* call the Python-level function */
-    PyFrame_FastToLocals(frame);
     result = PyEval_CallObject(callback, args);
     PyFrame_LocalsToFast(frame, 1);
     if (result == NULL)