8000 GH-127903: Fix a crash on DEBUG builds when calling `_copy_characters` by shadchin · Pull Request #127876 · python/cpython · GitHub
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GH-127903: Fix a crash on DEBUG builds when calling _copy_characters #127876

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Merged
merged 7 commits into from
Jan 3, 2025
Merged

GH-127903: Fix a crash on DEBUG builds when calling _copy_characters #127876

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c56b525
Fix segmentation fault
shadchin Dec 12, 2024
af5cedb
add news
shadchin Dec 13, 2024
8a32548
add test
shadchin Dec 14, 2024
02043a8
fix comments
shadchin Dec 17, 2024
ad692fb
fix assert
shadchin Dec 17, 2024
70ca11a
fix comment
shadchin Jan 3, 2025
6372a20
Update Lib/test/test_str.py
Eclips4 Jan 3, 2025
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fix comment
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@shadchin
shadchin committed Jan 3, 2025
commit 70ca11ab60ffe0639ffddb8023a5a14dbda86594
7 changes: 5 additions & 2 deletions Objects/unicodeobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1430,10 +1430,13 @@ _copy_characters(PyObject *to, Py_ssize_t to_start,
assert(from_start + how_many <= PyUnicode_GET_LENGTH(from));

assert(to == NULL || PyUnicode_Check(to));
assert(how_many == 0 || (to_start + how_many <= PyUnicode_GET_LENGTH(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);
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