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Fix insufficient check for overflow in tm2abstime(), per report from jw.

This commit is contained in:
Tom Lane 2005-07-22 19:55:50 +00:00
parent 37c443eefd
commit 4749e914ae
1 changed files with 8 additions and 5 deletions
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13
src/backend/utils/adt/nabstime.c
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@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/nabstime.c,v 1.140 2005/07/22 03:46:33 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/nabstime.c,v 1.141 2005/07/22 19:55:50 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -29,7 +29,7 @@
#include "utils/builtins.h"
#include "utils/nabstime.h"
#define MIN_DAYNUM -24856 /* December 13, 1901 */
#define MIN_DAYNUM (-24856) /* December 13, 1901 */
#define MAX_DAYNUM 24854 /* January 18, 2038 */
#define INVALID_RELTIME_STR "Undefined RelTime"
@ -201,9 +201,12 @@ tm2abstime(struct pg_tm *tm, int tz)
/* convert to seconds */
sec = tm->tm_sec + tz + (tm->tm_min + (day * HOURS_PER_DAY + tm->tm_hour) * MINS_PER_HOUR) * SECS_PER_MINUTE;
/* check for overflow */
if ((day == MAX_DAYNUM && sec < 0) ||
(day == MIN_DAYNUM && sec > 0))
/*
* check for overflow. We need a little slop here because the H/M/S plus
* TZ offset could add up to more than 1 day.
*/
if ((day >= MAX_DAYNUM-10 && sec < 0) ||
(day <= MIN_DAYNUM+10 && sec > 0))
return INVALID_ABSTIME;
/* check for reserved values (e.g. "current" on edge of usual range */