In array_position()/array_positions(), beware of empty input array. These functions incautiously fetched the array's first lower bound even when the array is zero-dimensional, thus fetching the word after the allocated array space. While almost always harmless, with very bad luck this could result in SIGSEGV. Fix by adding an early exit for empty input.
Per bug #17920 from Alexander Lakhin. Discussion: https://postgr.es/m/17920-f7c228c627b6d02e%40postgresql.org Branch ------ REL_14_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/d5de344a50d3fa03fad38fe41cc3443db4143bb5 Modified Files -------------- src/backend/utils/adt/array_userfuncs.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-)
