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_15_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/ccb479e76ac3032ef942f5d4f6a3ab742c2db03e Modified Files -------------- src/backend/utils/adt/array_userfuncs.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-)
