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_12_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/580df507896351a0ebb5a09c2c84c0eac7b6740f Modified Files -------------- src/backend/utils/adt/array_userfuncs.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-)
