Add news item for _winreg fix (SF bug 851056).
diff --git a/Misc/NEWS b/Misc/NEWS
index c905365..ce9d779 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -270,6 +270,11 @@
Windows
-------
+- The _winreg module could segfault when reading very large registry
+ values, due to unchecked alloca() calls (SF bug 851056). The fix is
+ uses either PyMem_Malloc(n) or PyString_FromStringAndSize(NULL, n),
+ as appropriate, followed by a size check.
+
- file.truncate() could misbehave if the file was open for update
(modes r+, rb+, w+, wb+), and the most recent file operation before
the truncate() call was an input operation. SF bug 801631.