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Issue #23517: Fix _PyTime_ObjectToDenominator() 

* initialize numerator on overflow error ensure that numerator is smaller than
* denominator.
This commit is contained in:
Victor Stinner 2015-09-02 10:37:46 +02:00
parent a53ec7a91a
commit 67edcc905d
1 changed files with 17 additions and 18 deletions
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29
Python/pytime.c
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@ -60,6 +60,7 @@ _PyLong_FromTime_t(time_t t)
#endif #endif
} }
/* Round to nearest with ties going away from zero (_PyTime_ROUND_HALF_UP). */
static double static double
_PyTime_RoundHalfUp(double x) _PyTime_RoundHalfUp(double x)
{ {
@ -81,32 +82,31 @@ _PyTime_DoubleToDenominator(double d, time_t *sec, long *numerator,
floatpart = modf(d, &intpart); floatpart = modf(d, &intpart);
if (floatpart < 0) { if (floatpart < 0) {
floatpart = 1.0 + floatpart; floatpart += 1.0;
intpart -= 1.0; intpart -= 1.0;
} }
floatpart *= denominator; floatpart *= denominator;
if (round == _PyTime_ROUND_HALF_UP) if (round == _PyTime_ROUND_HALF_UP)
floatpart = _PyTime_RoundHalfUp(floatpart); floatpart = _PyTime_RoundHalfUp(floatpart);
else if (round == _PyTime_ROUND_CEILING) { else if (round == _PyTime_ROUND_CEILING)
floatpart = ceil(floatpart); floatpart = ceil(floatpart);
else
floatpart = floor(floatpart);
if (floatpart >= denominator) { if (floatpart >= denominator) {
floatpart = 0.0; floatpart -= denominator;
intpart += 1.0; intpart += 1.0;
} }
} assert(0.0 <= floatpart && floatpart < denominator);
else {
floatpart = floor(floatpart);
}
*sec = (time_t)intpart; *sec = (time_t)intpart;
*numerator = (long)floatpart;
err = intpart - (double)*sec; err = intpart - (double)*sec;
if (err <= -1.0 || err >= 1.0) { if (err <= -1.0 || err >= 1.0) {
error_time_t_overflow(); error_time_t_overflow();
return -1; return -1;
} }
*numerator = (long)floatpart;
return 0; return 0;
} }
@ -123,9 +123,9 @@ _PyTime_ObjectToDenominator(PyObject *obj, time_t *sec, long *numerator,
} }
else { else {
*sec = _PyLong_AsTime_t(obj); *sec = _PyLong_AsTime_t(obj);
*numerator = 0;
if (*sec == (time_t)-1 && PyErr_Occurred()) if (*sec == (time_t)-1 && PyErr_Occurred())
return -1; return -1;
*numerator = 0;
return 0; return 0;
} }
} }
@ -444,12 +444,11 @@ _PyTime_AsTimeval_impl(_PyTime_t t, struct timeval *tv, _PyTime_round_t round,
tv->tv_sec += 1; tv->tv_sec += 1;
} }
assert(0 <= usec && usec < SEC_TO_US);
tv->tv_usec = usec;
if (res && raise) if (res && raise)
_PyTime_overflow(); _PyTime_overflow();
assert(0 <= usec && usec <= 999999);
tv->tv_usec = usec;
return res; return res;
} }
@ -484,7 +483,7 @@ _PyTime_AsTimespec(_PyTime_t t, struct timespec *ts)
} }
ts->tv_nsec = nsec; ts->tv_nsec = nsec;
assert(0 <= ts->tv_nsec && ts->tv_nsec <= 999999999); assert(0 <= ts->tv_nsec && ts->tv_nsec < SEC_TO_NS);
return 0; return 0;
} }
#endif #endif