1 files changed, 5 insertions, 0 deletions
diff --git a/Misc/NEWS b/Misc/NEWS
index 146a39c..011663d 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -49,6 +49,11 @@ Extension Modules
 Library
 -------
 
+- bpo-30061: Fixed crashes in IOBase methods __next__() and readlines() when
+  readline() or __next__() respectively return non-sizeable object.
+  Fixed possible other errors caused by not checking results of PyObject_Size(),
+  PySequence_Size(), or PyMapping_Size().
+
 - bpo-30068: _io._IOBase.readlines will check if it's closed first when
   hint is present.