do not allow _PyGen_Finalize to fail (closes #27811)

Patch from Armin Rigo.

1 files changed, 13 insertions, 12 deletions

diff --git a/Objects/genobject.c b/Objects/genobject.c
index b3e0a46e8b..a9ea5c2478 100644
--- a/Objects/genobject.c
+++ b/Objects/genobject.c
@@ -24,26 +24,27 @@ _PyGen_Finalize(PyObject *self)
     PyObject *res;
     PyObject *error_type, *error_value, *error_traceback;
 
+    if (gen->gi_frame == NULL || gen->gi_frame->f_stacktop == NULL)
+        /* Generator isn't paused, so no need to close */
+        return;
+
+    /* Save the current exception, if any. */
+    PyErr_Fetch(&error_type, &error_value, &error_traceback);
+
     /* If `gen` is a coroutine, and if it was never awaited on,
        issue a RuntimeWarning. */
     if (gen->gi_code != NULL
             && ((PyCodeObject *)gen->gi_code)->co_flags & CO_COROUTINE
-            && gen->gi_frame != NULL
             && gen->gi_frame->f_lasti == -1
             && !PyErr_Occurred()
             && PyErr_WarnFormat(PyExc_RuntimeWarning, 1,
                                 "coroutine '%.50S' was never awaited",
-                                gen->gi_qualname))
-        return;
-
-    if (gen->gi_frame == NULL || gen->gi_frame->f_stacktop == NULL)
-        /* Generator isn't paused, so no need to close */
-        return;
-
-    /* Save the current exception, if any. */
-    PyErr_Fetch(&error_type, &error_value, &error_traceback);
-
-    res = gen_close(gen, NULL);
+                                gen->gi_qualname)) {
+        res = NULL;  /* oops, exception */
+    }
+    else {
+        res = gen_close(gen, NULL);
+    }
 
     if (res == NULL)
         PyErr_WriteUnraisable(self);