commit 5a57ade58ec5bee85db41b8ce1340ff077781b65
author Serhiy Storchaka <storchaka@gmail.com> Thu Dec 24 10:35:59 2015 +0200
committer Serhiy Storchaka <storchaka@gmail.com> Thu Dec 24 10:35:59 2015 +0200
tree 2f8cf61efba46284b2d4437916bc3469d23c0ce3
parent a198645fa0f9a9c6183c211955083765dc8ab3a8

Issue #20440: Massive replacing unsafe attribute setting code with special
macro Py_SETREF.

Modules/_io/bytesio.c

diff --git a/Modules/_io/bytesio.c b/Modules/_io/bytesio.c
index eef3b3d..99e71bc 100644
--- a/Modules/_io/bytesio.c
+++ b/Modules/_io/bytesio.c
@@ -969,8 +969,7 @@
     if (initvalue && initvalue != Py_None) {
         if (PyBytes_CheckExact(initvalue)) {
             Py_INCREF(initvalue);
-            Py_XDECREF(self->buf);
-            self->buf = initvalue;
+            Py_SETREF(self->buf, initvalue);
             self->string_size = PyBytes_GET_SIZE(initvalue);
         }
         else {