Tighten array dimensionality checks in Perl -> SQL array conversion. plperl_array_to_datum() wasn't sufficiently careful about checking that nested lists represent a rectangular array structure; it would accept inputs such as "[1, []]". This is a bit related to the PL/Python bug fixed in commit 81eaaf65e, but it doesn't seem to provide any direct route to a memory stomp. Instead the likely failure mode is for makeMdArrayResult to be passed fewer Datums than the claimed array dimensionality requires, possibly leading to a wild pointer dereference and SIGSEGV.
Per report from Alexander Lakhin. It's been broken for a long time, so back-patch to all supported branches. Discussion: https://postgr.es/m/5ebae5e4-d401-fadf-8585-ac3eaf532...@gmail.com Branch ------ REL_14_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/1e868bb6c67a19614c0f30b69bd5b624d72b1245 Modified Files -------------- src/pl/plperl/expected/plperl_array.out | 43 +++++++++++++++++++++++ src/pl/plperl/plperl.c | 62 +++++++++++++++++++++------------ src/pl/plperl/sql/plperl_array.sql | 37 ++++++++++++++++++++ 3 files changed, 119 insertions(+), 23 deletions(-)
