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bpo-33199: Initialize ma_version_tag in PyDict_Copy (GH-6341)

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(cherry picked from commit d1c82c5cc7)

Co-authored-by: INADA Naoki <methane@users.noreply.github.com>
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Miss Islington (bot) 2018-04-02 20:00:26 -07:00 • committed by GitHub
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Misc/NEWS.d/next/Core and Builtins/2018-04-02-09-32-40.bpo-33199.TPnxQu.rst Normal file
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@ -0,0 +1,2 @@
Fix ``ma_version_tag`` in dict implementation is uninitialized when copying
from key-sharing dict.

1
Objects/dictobject.c
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@ -2551,6 +2551,7 @@ PyDict_Copy(PyObject *o)
split_copy->ma_values = newvalues; split_copy->ma_values = newvalues;
split_copy->ma_keys = mp->ma_keys; split_copy->ma_keys = mp->ma_keys;
split_copy->ma_used = mp->ma_used; split_copy->ma_used = mp->ma_used;
split_copy->ma_version_tag = DICT_NEXT_VERSION();
DK_INCREF(mp->ma_keys); DK_INCREF(mp->ma_keys);
for (i = 0, n = size; i < n; i++) { for (i = 0, n = size; i < n; i++) {
PyObject *value = mp->ma_values[i]; PyObject *value = mp->ma_values[i];