[Python-checkins] cpython (3.4): Issue #21868: Prevent turtle crash due to invalid undo buffer size.

[raymond.hettinger]

http://hg.python.org/cpython/rev/02b25ec13c94
changeset:   91740:02b25ec13c94
branch:      3.4
parent:      91737:a821cc06082b
user:        Raymond Hettinger <python at rcn.com>
date:        Sun Jul 20 21:30:32 2014 -0700
summary:
  Issue #21868: Prevent turtle crash due to invalid undo buffer size.

files:
  Lib/turtle.py |  2 +-
  Misc/NEWS     |  2 ++
  2 files changed, 3 insertions(+), 1 deletions(-)


diff --git a/Lib/turtle.py b/Lib/turtle.py
--- a/Lib/turtle.py
+++ b/Lib/turtle.py
@@ -2594,7 +2594,7 @@
         Example (for a Turtle instance named turtle):
         >>> turtle.setundobuffer(42)
         """
-        if size is None:
+        if size is None or size <= 0:
             self.undobuffer = None
         else:
             self.undobuffer = Tbuffer(size)
diff --git a/Misc/NEWS b/Misc/NEWS
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -30,6 +30,8 @@
 - Issue #21044: tarfile.open() now handles fileobj with an integer 'name'
   attribute.  Based on patch by Martin Panter.
 
+- Issue #21867:  Prevent turtle crash due to invalid undo buffer size.
+
 - Issue #19076: Don't pass the redundant 'file' argument to self.error().
 
 - Issue #21942: Fixed source file viewing in pydoc's server mode on Windows.

-- 
Repository URL: http://hg.python.org/cpython