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gh-155835: fix digest_size data race on BLAKE-2 objects #155839

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gh-155835: fix digest_size data race on BLAKE-2 objects #155839

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gh-155835: fix `digest_size` data race on BLAKE-2 objects
picnixz Aug 15, 2026
374bfef
Update blake2module.c
picnixz Aug 15, 2026
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2026-08-15-13-18-01.gh-issue-155835.mlyLWp.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
:mod:`hashlib`: Fix a data race when accessing :attr:`~hashlib.hash.digest_size`
on BLAKE-2 objects. Patch by Bénédikt Tran.
2 changes: 2 additions & 0 deletions Modules/blake2module.c
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Expand Up @@ -950,7 +950,9 @@ static PyObject *
py_blake2b_get_digest_size(PyObject *op, void *Py_UNUSED(closure))
{
Blake2Object *self = _Blake2Object_CAST(op);
HASHLIB_ACQUIRE_LOCK(self);
Hacl_Hash_Blake2b_index info = hacl_get_blake2_info(self);
HASHLIB_RELEASE_LOCK(self);
return PyLong_FromLong(info.digest_length);
}

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