Issue #12839: Fix crash in zlib module due to version mismatch.
If the version of zlib used to compile the zlib module is incompatible
with the one that is actually linked in, then calls into zlib will fail.
This can leave attributes of the z_stream uninitialized, so we must take
care to avoid segfaulting by trying to use an invalid pointer.
Fix by Richard M. Tew.
diff --git a/Misc/NEWS b/Misc/NEWS
index f6fe5b7..23b336b 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -22,6 +22,9 @@
Library
-------
+- Issue #12839: Fix crash in zlib module due to version mismatch.
+ Fix by Richard M. Tew.
+
- Issue #11657: Fix sending file descriptors over 255 over a multiprocessing
Pipe.