Avoid integer overflow hazard in interval_time(). When casting an interval to a time, the original code suffered from 64-bit integer overflow for inputs with a sufficiently large negative "time" field, leading to bogus results.
Fix by rewriting the algorithm in a simpler form, that more obviously cannot overflow. While at it, improve the test coverage to include negative interval inputs. Discussion: https://postgr.es/m/CAEZATCXoUKHkcuq4q63hkiPsKZJd0kZWzgKtU%2BNT0aU4wbf_Pw%40mail.gmail.com Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/3850d4dec1d91c4fdce274f42986840444d5593e Modified Files -------------- src/backend/utils/adt/date.c | 15 +++------------ src/test/regress/expected/horology.out | 12 ++++++++++++ src/test/regress/sql/horology.sql | 2 ++ 3 files changed, 17 insertions(+), 12 deletions(-)
