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[3.12] gh-127903: Fix a crash on debug builds when calling Objects/unicodeobject::_copy_characters (GH-127876) (#128459)

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gh-127903: Fix a crash on debug builds when calling `Objects/unicodeobject::_copy_characters`` (GH-127876)
(cherry picked from commit 46cb6340d7)

Co-authored-by: Alexander Shadchin <shadchin@yandex-team.com>
This commit is contained in:
Miss Islington (bot) 2025-01-03 20:21:08 +01:00 • committed by GitHub
parent d9e199b491
commit e44045924d
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3 changed files with 15 additions and 3 deletions
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9
Objects/unicodeobject.c
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@ -1472,11 +1472,14 @@ _copy_characters(PyObject *to, Py_ssize_t to_start,
assert(PyUnicode_Check(from));
assert(from_start + how_many <= PyUnicode_GET_LENGTH(from));
assert(PyUnicode_Check(to));
assert(to_start + how_many <= PyUnicode_GET_LENGTH(to));
assert(to == NULL || PyUnicode_Check(to));
if (how_many == 0)
if (how_many == 0) {
return 0;
}
assert(to != NULL);
assert(to_start + how_many <= PyUnicode_GET_LENGTH(to));
from_kind = PyUnicode_KIND(from);
from_data = PyUnicode_DATA(from);