[issue18408] Fixes crashes found by pyfailmalloc

[Roundup Robot]

Roundup Robot added the comment:

New changeset 533eb9ab895a by Victor Stinner in branch 'default':
Issue #18408: Fix fileio_read() on _PyBytes_Resize() failure
http://hg.python.org/cpython/rev/533eb9ab895a

New changeset f0efd7ea1627 by Victor Stinner in branch 'default':
Issue #18408: Fix cjkcodecs decoders, add a new MBERR_EXCEPTION constant to
http://hg.python.org/cpython/rev/f0efd7ea1627

New changeset 395e67f348e7 by Victor Stinner in branch 'default':
Issue #18408: Fix list.extend(), handle list_resize() failure
http://hg.python.org/cpython/rev/395e67f348e7

New changeset ac4e8e6a7436 by Victor Stinner in branch 'default':
Issue #18408: Fix PyDict_GetItemString(), suppress PyUnicode_FromString() error
http://hg.python.org/cpython/rev/ac4e8e6a7436

New changeset b7c6d203c9fb by Victor Stinner in branch 'default':
Issue #18408: dict_new() now fails on new_keys_object() error
http://hg.python.org/cpython/rev/b7c6d203c9fb

New changeset 28ff7ac91477 by Victor Stinner in branch 'default':
Issue #18408: Py_ReprLeave() now saves/restores the current exception,
http://hg.python.org/cpython/rev/28ff7ac91477

New changeset 6bd01a59762a by Victor Stinner in branch 'default':
Issue #18408: handle PySys_GetObject() failure, raise a RuntimeError
http://hg.python.org/cpython/rev/6bd01a59762a

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<http://bugs.python.org/issue18408>
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