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gh-127903: Fix a crash on debug builds when calling Objects/unicodeobject::_copy_characters` (#127876)

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This commit is contained in:
Alexander Shadchin
2025-01-03 21:47:58 +03:00
committed by GitHub
parent 4c14f03495
commit 46cb6340d7
3 changed files with 15 additions and 3 deletions
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9
Objects/unicodeobject.c
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@@ -1463,11 +1463,14 @@ _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);