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bpo-13312: Avoid int underflow in time year. (GH-8912)

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Avoids an integer underflow in the time module's year handling code.
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Gregory P. Smith 2018-08-24 18:08:50 -07:00 • committed by GitHub
parent eb746dbae8
commit 76be0fffff
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3 changed files with 13 additions and 6 deletions
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6
Modules/timemodule.c
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@ -551,6 +551,12 @@ gettmarg(PyObject *args, struct tm *p, const char *format)
&p->tm_hour, &p->tm_min, &p->tm_sec,
&p->tm_wday, &p->tm_yday, &p->tm_isdst))
return 0;
if (y < INT_MIN + 1900) {
PyErr_SetString(PyExc_OverflowError, "year out of range");
return 0;
}
p->tm_year = y - 1900;
p->tm_mon--;
p->tm_wday = (p->tm_wday + 1) % 7;