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bpo-44954: Fix wrong result in float.fromhex corner case (GH-27834)

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(cherry picked from commit 60b93d9e49)

Co-authored-by: Mark Dickinson <mdickinson@enthought.com>
This commit is contained in:
Miss Islington (bot) 2021-08-20 10:48:47 -07:00 • committed by GitHub
parent f0e2a46349
commit 838b0e975f
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3 changed files with 18 additions and 2 deletions
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4
Objects/floatobject.c
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@ -1463,8 +1463,8 @@ float_fromhex(PyTypeObject *type, PyObject *string)
bits lsb, lsb-2, lsb-3, lsb-4, ... is 1. */
if ((digit & half_eps) != 0) {
round_up = 0;
if ((digit & (3*half_eps-1)) != 0 ||
(half_eps == 8 && (HEX_DIGIT(key_digit+1) & 1) != 0))
if ((digit & (3*half_eps-1)) != 0 || (half_eps == 8 &&
key_digit+1 < ndigits && (HEX_DIGIT(key_digit+1) & 1) != 0))
round_up = 1;
else
for (i = key_digit-1; i >= 0; i--)