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[3.11] gh-105375: Harden _datetime initialisation (GH-105604) #105646

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Merged
merged 1 commit into from
Jun 11, 2023
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[3.11] gh-105375: Harden _datetime initialisation (GH-105604) #105646

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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2023-06-09-22-45-26.gh-issue-105375.9rp6tG.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Fix bugs in :mod:`!_datetime` where exceptions could be overwritten in case
of module initialisation failure.
35 changes: 30 additions & 5 deletions Modules/_datetimemodule.c
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Original file line number Diff line number Diff line change
Expand Up @@ -6878,24 +6878,49 @@ _datetime_exec(PyObject *module)
assert(DI100Y == days_before_year(100+1));

us_per_ms = PyLong_FromLong(1000);
if (us_per_ms == NULL) {
goto error;
}
us_per_second = PyLong_FromLong(1000000);
if (us_per_second == NULL) {
goto error;
}
us_per_minute = PyLong_FromLong(60000000);
if (us_per_minute == NULL) {
goto error;
}
seconds_per_day = PyLong_FromLong(24 * 3600);
if (us_per_ms == NULL || us_per_second == NULL ||
us_per_minute == NULL || seconds_per_day == NULL) {
return -1;
if (seconds_per_day == NULL) {
goto error;
}

/* The rest are too big for 32-bit ints, but even
* us_per_week fits in 40 bits, so doubles should be exact.
*/
us_per_hour = PyLong_FromDouble(3600000000.0);
if (us_per_hour == NULL) {
goto error;
}
us_per_day = PyLong_FromDouble(86400000000.0);
if (us_per_day == NULL) {
goto error;
}
us_per_week = PyLong_FromDouble(604800000000.0);
if (us_per_hour == NULL || us_per_day == NULL || us_per_week == NULL) {
return -1;
if (us_per_week == NULL) {
goto error;
}

return 0;

error:
Py_XDECREF(us_per_ms);
Py_XDECREF(us_per_second);
Py_XDECREF(us_per_minute);
Py_XDECREF(us_per_hour);
Py_XDECREF(us_per_day);
Py_XDECREF(us_per_week);
Py_XDECREF(seconds_per_day);
return -1;
}

static struct PyModuleDef datetimemodule = {
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