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Crash in Objects/unicodeobject.c::_copy_characters when there is nothing to copy (DEBUG build only) #127903
Description
Crash report
What happened?
Reproduce on Python 3.12.8+ or 3.13.1+, main work fine, but there is a problem there too:
./configure --with-pydebug
make
./python --version
Python 3.13.1+
./python -c 'import datetime as dt; dt.datetime(2013, 11, 10, 14, 20, 59).strftime("%z")'
Segmentation faultNo need to check to if we don't write there
Fix in #127876
CPython versions tested on:
3.12, 3.13
Operating systems tested on:
Linux
Output from running 'python -VV' on the command line:
Python 3.13.1+ (heads/3.13:d51c1444e3, Dec 12 2024, 19:36:26) [GCC 9.4.0]
Linked PRs
- GH-127903: Fix a crash on DEBUG builds when calling
_copy_characters#127876 - [3.13] gh-127903: Fix a crash on debug builds when calling
Objects/unicodeobject::_copy_characters(GH-127876) #128458 - [3.12] gh-127903: Fix a crash on debug builds when calling
Objects/unicodeobject::_copy_characters(GH-127876) #128459
Activity
mgorny commentedon Jan 2, 2025
Just hit this in the wild with
pikepdf.gh-127903: Fix a crash on debug builds when calling `Objects/unicodeo…
pythongh-127903: Fix a crash on debug builds when calling `Objects/un…
pythongh-127903: Fix a crash on debug builds when calling `Objects/un…
[-]Segmentation fault in pydebug mode[/-][+]Crash in `Objects/unicodeobject.c::_copy_characters` when there is nothing to copy[/+][-]Crash in `Objects/unicodeobject.c::_copy_characters` when there is nothing to copy[/-][+]Crash in `Objects/unicodeobject.c::_copy_characters` when there is nothing to copy (DEBUG build only)[/+]picnixz commentedon Jan 3, 2025
Even if
mainwas said to work well, we also fixed the assertion as it could have been by chance that this worked.[3.13] gh-127903: Fix a crash on debug builds when calling `Objects/u…
[3.12] gh-127903: Fix a crash on debug builds when calling `Objects/u…
Eclips4 commentedon Jan 3, 2025
Thank you @shadchin for reporting and fixing this!
pythongh-127903: Fix a crash on debug builds when calling `Objects/un…
pythongh-127903: Fix a crash on debug builds when calling `Objects/un…