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Guard against overflow in interval_mul() and interval_div(). 

Commits 146604ec43 and a898b409f6 added overflow checks to
interval_mul(), but not to interval_div(), which contains almost
identical code, and so is susceptible to the same kinds of
overflows. In addition, those checks did not catch all possible
overflow conditions.

Add additional checks to the "cascade down" code in interval_mul(),
and copy all the overflow checks over to the corresponding code in
interval_div(), so that they both generate "interval out of range"
errors, rather than returning bogus results.

Given that these errors are relatively easy to hit, back-patch to all
supported branches.

Per bug #18200 from Alexander Lakhin, and subsequent investigation.

Discussion: https://postgr.es/m/18200-5ea288c7b2d504b1%40postgresql.org
This commit is contained in:
Dean Rasheed 2023-11-18 14:48:10 +00:00
parent 75a20a4b4b
commit 2ffcebdba4
3 changed files with 69 additions and 21 deletions
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69
src/backend/utils/adt/timestamp.c
View File

@ -3190,19 +3190,13 @@ interval_mul(PG_FUNCTION_ARGS)
result = (Interval *) palloc(sizeof(Interval));
result_double = span->month * factor;
if (isnan(result_double) ||
result_double > INT_MAX || result_double < INT_MIN)
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("interval out of range")));
if (isnan(result_double) || !FLOAT8_FITS_IN_INT32(result_double))
goto out_of_range;
result->month = (int32) result_double;
result_double = span->day * factor;
if (isnan(result_double) ||
result_double > INT_MAX || result_double < INT_MIN)
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("interval out of range")));
if (isnan(result_double) || !FLOAT8_FITS_IN_INT32(result_double))
goto out_of_range;
result->day = (int32) result_double;
/*
@ -3236,20 +3230,30 @@ interval_mul(PG_FUNCTION_ARGS)
*/
if (Abs(sec_remainder) >= SECS_PER_DAY)
{
result->day += (int) (sec_remainder / SECS_PER_DAY);
if (pg_add_s32_overflow(result->day,
(int) (sec_remainder / SECS_PER_DAY),
&result->day))
goto out_of_range;
sec_remainder -= (int) (sec_remainder / SECS_PER_DAY) * SECS_PER_DAY;
}
/* cascade units down */
result->day += (int32) month_remainder_days;
if (pg_add_s32_overflow(result->day, (int32) month_remainder_days,
&result->day))
goto out_of_range;
result_double = rint(span->time * factor + sec_remainder * USECS_PER_SEC);
if (isnan(result_double) || !FLOAT8_FITS_IN_INT64(result_double))
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("interval out of range")));
goto out_of_range;
result->time = (int64) result_double;
PG_RETURN_INTERVAL_P(result);
out_of_range:
ereport(ERROR,
errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("interval out of range"));
PG_RETURN_NULL(); /* keep compiler quiet */
}
Datum
@ -3268,7 +3272,8 @@ interval_div(PG_FUNCTION_ARGS)
Interval *span = PG_GETARG_INTERVAL_P(0);
float8 factor = PG_GETARG_FLOAT8(1);
double month_remainder_days,
sec_remainder;
sec_remainder,
result_double;
int32 orig_month = span->month,
orig_day = span->day;
Interval *result;
@ -3280,8 +3285,15 @@ interval_div(PG_FUNCTION_ARGS)
(errcode(ERRCODE_DIVISION_BY_ZERO),
errmsg("division by zero")));
result->month = (int32) (span->month / factor);
result->day = (int32) (span->day / factor);
result_double = span->month / factor;
if (isnan(result_double) || !FLOAT8_FITS_IN_INT32(result_double))
goto out_of_range;
result->month = (int32) result_double;
result_double = span->day / factor;
if (isnan(result_double) || !FLOAT8_FITS_IN_INT32(result_double))
goto out_of_range;
result->day = (int32) result_double;
/*
* Fractional months full days into days. See comment in interval_mul().
@ -3293,15 +3305,30 @@ interval_div(PG_FUNCTION_ARGS)
sec_remainder = TSROUND(sec_remainder);
if (Abs(sec_remainder) >= SECS_PER_DAY)
{
result->day += (int) (sec_remainder / SECS_PER_DAY);
if (pg_add_s32_overflow(result->day,
(int) (sec_remainder / SECS_PER_DAY),
&result->day))
goto out_of_range;
sec_remainder -= (int) (sec_remainder / SECS_PER_DAY) * SECS_PER_DAY;
}
/* cascade units down */
result->day += (int32) month_remainder_days;
result->time = rint(span->time / factor + sec_remainder * USECS_PER_SEC);
if (pg_add_s32_overflow(result->day, (int32) month_remainder_days,
&result->day))
goto out_of_range;
result_double = rint(span->time / factor + sec_remainder * USECS_PER_SEC);
if (isnan(result_double) || !FLOAT8_FITS_IN_INT64(result_double))
goto out_of_range;
result->time = (int64) result_double;
PG_RETURN_INTERVAL_P(result);
out_of_range:
ereport(ERROR,
errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("interval out of range"));
PG_RETURN_NULL(); /* keep compiler quiet */
}

13
src/test/regress/expected/interval.out
View File

@ -357,6 +357,19 @@ SELECT * FROM INTERVAL_TBL;
@ 5 mons 12 hours
(10 rows)
-- multiplication and division overflow test cases
SELECT '3000000 months'::interval * 1000;
ERROR: interval out of range
SELECT '3000000 months'::interval / 0.001;
ERROR: interval out of range
SELECT '3000000 days'::interval * 1000;
ERROR: interval out of range
SELECT '3000000 days'::interval / 0.001;
ERROR: interval out of range
SELECT '1 month 2146410 days'::interval * 1000.5002;
ERROR: interval out of range
SELECT make_interval(0, 0, 0, 0, 0, 0, 4611686018427.387904) / 0.1;
ERROR: interval out of range
-- test avg(interval), which is somewhat fragile since people have been
-- known to change the allowed input syntax for type interval without
-- updating pg_aggregate.agginitval

8
src/test/regress/sql/interval.sql
View File

@ -129,6 +129,14 @@ SET IntervalStyle to postgres_verbose;
SELECT * FROM INTERVAL_TBL;
-- multiplication and division overflow test cases
SELECT '3000000 months'::interval * 1000;
SELECT '3000000 months'::interval / 0.001;
SELECT '3000000 days'::interval * 1000;
SELECT '3000000 days'::interval / 0.001;
SELECT '1 month 2146410 days'::interval * 1000.5002;
SELECT make_interval(0, 0, 0, 0, 0, 0, 4611686018427.387904) / 0.1;
-- test avg(interval), which is somewhat fragile since people have been
-- known to change the allowed input syntax for type interval without
-- updating pg_aggregate.agginitval