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Fix various overflow hazards in date and timestamp functions.

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This commit makes use of the overflow-aware routines in int.h to
fix a variety of reported overflow bugs in the date and timestamp
code.  It seems unlikely that this fixes all such bugs in this
area, but since the problems seem limited to cases that are far
beyond any realistic usage, I'm not going to worry too much.  Note
that for one bug, I've chosen to simply add a comment about the
overflow hazard because fixing it would require quite a bit of code
restructuring that doesn't seem worth the risk.

Since this is a bug fix, it could be back-patched, but given the
risk of conflicts with the new routines in int.h and the overall
risk/reward ratio of this patch, I've opted not to do so for now.

Fixes bug #18585 (except for the one case that's just commented).

Reported-by: Alexander Lakhin
Author: Matthew Kim, Nathan Bossart
Reviewed-by: Joseph Koshakow, Jian He
Discussion: https://postgr.es/m/31ad2cd1-db94-bdb3-f91a-65ffdb4bef95%40gmail.com
Discussion: https://postgr.es/m/18585-db646741dd649abd%40postgresql.org
This commit is contained in:
Nathan Bossart
2024-12-09 13:47:23 -06:00
parent 3eea7a0c97
commit 0a27c3d0f7
8 changed files with 179 additions and 9 deletions
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4
src/backend/utils/adt/timestamp.c
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@ -5104,6 +5104,10 @@ interval_trunc(PG_FUNCTION_ARGS)
*
* Return the Julian day which corresponds to the first day (Monday) of the given ISO 8601 year and week.
* Julian days are used to convert between ISO week dates and Gregorian dates.
*
* XXX: This function has integer overflow hazards, but restructuring it to
* work with the soft-error handling that its callers do is likely more
* trouble than it's worth.
*/
int
isoweek2j(int year, int week)