Issue #21435: Segfault in gc with cyclic trash

Changed the iteration logic in finalize_garbage() to tolerate objects vanishing
from the list as a side effect of executing a finalizer.

1 files changed, 7 insertions, 0 deletions

diff --git a/Misc/NEWS b/Misc/NEWS
index 29634fc..d0d9012 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -7,6 +7,13 @@ What's New in Python 3.4.1?
 
 Release date: TBA
 
+Core and Builtins
+-----------------
+
+- Issue #21435: In rare cases, when running finalizers on objects in cyclic
+  trash a bad pointer dereference could occur due to a subtle flaw in
+  internal iteration logic.
+
 Library
 -------