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[3.12] gh-102509: Start initializing ob_digit of _PyLongValue (GH-102510) (#107464)

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gh-102509: Start initializing `ob_digit` of `_PyLongValue` (GH-102510)
(cherry picked from commit fc130c47da)

Co-authored-by: Illia Volochii <illia.volochii@gmail.com>
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Miss Islington (bot) 2023-07-31 05:27:59 -07:00 • committed by GitHub
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Misc/NEWS.d/next/Security/2023-03-07-21-46-29.gh-issue-102509.5ouaH_.rst Normal file
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@ -0,0 +1,2 @@
Start initializing ``ob_digit`` during creation of :c:type:`PyLongObject`
objects. Patch by Illia Volochii.

3
Objects/longobject.c
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@ -163,6 +163,9 @@ _PyLong_New(Py_ssize_t size)
} }
_PyLong_SetSignAndDigitCount(result, size != 0, size); _PyLong_SetSignAndDigitCount(result, size != 0, size);
_PyObject_Init((PyObject*)result, &PyLong_Type); _PyObject_Init((PyObject*)result, &PyLong_Type);
/* The digit has to be initialized explicitly to avoid
* use-of-uninitialized-value. */
result->long_value.ob_digit[0] = 0;
return result; return result;
} }