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gh-154037: Fix race in the Decimal.__hash__() #154045

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Merged
kumaraditya303 merged 3 commits into from
Jul 30, 2026
Merged

gh-154037: Fix race in the Decimal.__hash__() #154045

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ef09f8c
gh-154037: Fix race in the Decimal.__hash__()
skirpichev Jul 19, 2026
d3d8268
use local variable
skirpichev Jul 19, 2026
c9e1c79
+1
skirpichev Jul 19, 2026
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gh-154037: Fix race in the Decimal.__hash__()
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@skirpichev
skirpichev committed Jul 19, 2026
commit ef09f8c0cb1aaeba47175ee9ac91c1812270afa7
8 changes: 4 additions & 4 deletions Modules/_decimal/_decimal.c
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Original file line number Diff line number Diff line change
Expand Up @@ -5921,11 +5921,11 @@ static Py_hash_t
dec_hash(PyObject *op)
{
PyDecObject *self = _PyDecObject_CAST(op);
if (self->hash == -1) {
self->hash = _dec_hash(self);
}

return self->hash;
if (FT_ATOMIC_LOAD_SSIZE_RELAXED(self->hash) == -1) {
FT_ATOMIC_STORE_SSIZE_RELAXED(self->hash, _dec_hash(self));
}
return FT_ATOMIC_LOAD_SSIZE_RELAXED(self->hash);
}

/*[clinic input]
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