merge 3.3 (#17669)

Misc/NEWS

@@ -10,6 +10,8 @@ What's New in Python 3.4.0 Alpha 1?
 Core and Builtins
 -----------------
 
+- Issue #17669: Fix crash involving finalization of generators using yield from.
+
 - Issue #14439: Python now prints the traceback on runpy failure at startup.
 
 - Issue #17469: Fix _Py_GetAllocatedBlocks() and sys.getallocatedblocks()

Objects/genobject.c

@@ -178,7 +178,7 @@ gen_yf(PyGenObject *gen)
     PyObject *yf = NULL;
     PyFrameObject *f = gen->gi_frame;
 
-    if (f) {
+    if (f && f->f_stacktop) {
         PyObject *bytecode = f->f_code->co_code;
         unsigned char *code = (unsigned char *)PyBytes_AS_STRING(bytecode);