https://github.com/python/cpython/commit/ce373b845ce822a413ee8eb9bf161270825b38a2 commit: ce373b845ce822a413ee8eb9bf161270825b38a2 branch: 3.15 author: Miss Islington (bot) <[email protected]> committer: sobolevn <[email protected]> date: 2026-07-03T18:14:59Z summary:
[3.15] gh-152951 - Fix double DECREF when `newblock` fails during deque.extend calls (GH-152961) (#152971) gh-152951 - Fix double DECREF when `newblock` fails during deque.extend calls (GH-152961) (cherry picked from commit a90576d72c8a409f7c3ffcaefafb13945e3405ab) Co-authored-by: Steve Stagg <[email protected]> files: A Misc/NEWS.d/next/Library/2026-07-03-14-54-33.gh-issue-152951.u8tPCI.rst M Modules/_collectionsmodule.c diff --git a/Misc/NEWS.d/next/Library/2026-07-03-14-54-33.gh-issue-152951.u8tPCI.rst b/Misc/NEWS.d/next/Library/2026-07-03-14-54-33.gh-issue-152951.u8tPCI.rst new file mode 100644 index 00000000000000..c3d56c6d59c91b --- /dev/null +++ b/Misc/NEWS.d/next/Library/2026-07-03-14-54-33.gh-issue-152951.u8tPCI.rst @@ -0,0 +1,2 @@ +:class:`collections.deque` prevent rare crash when calling ``extend`` under +high memory pressure conditions. diff --git a/Modules/_collectionsmodule.c b/Modules/_collectionsmodule.c index 5ca6362406a78b..b0701df26bbd24 100644 --- a/Modules/_collectionsmodule.c +++ b/Modules/_collectionsmodule.c @@ -512,7 +512,6 @@ deque_extend_impl(dequeobject *deque, PyObject *iterable) iternext = *Py_TYPE(it)->tp_iternext; while ((item = iternext(it)) != NULL) { if (deque_append_lock_held(deque, item, maxlen) == -1) { - Py_DECREF(item); Py_DECREF(it); return NULL; } _______________________________________________ Python-checkins mailing list -- [email protected] To unsubscribe send an email to [email protected] https://mail.python.org/mailman3//lists/python-checkins.python.org Member address: [email protected]
