Обсуждение: pgsql: Validate ltree siglen GiST option to be int-aligned

Validate ltree siglen GiST option to be int-aligned

Unaligned siglen could lead to an unaligned access to subsequent key fields.

Backpatch to 13, where opclass options were introduced.

Reported-by: Alexander Lakhin
Bug: 17847
Discussion: https://postgr.es/m/17847-171232970bea406b%40postgresql.org
Reviewed-by: Tom Lane, Pavel Borisov, Alexander Lakhin
Backpatch-through: 13

Branch
------
REL_15_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/214495dc5b712552d3938d5f03acddfedc8a81ca

Modified Files
--------------
contrib/ltree/expected/ltree.out |  9 +++++++--
contrib/ltree/ltree_gist.c       | 17 ++++++++++++++++-
contrib/ltree/sql/ltree.sql      |  2 ++
doc/src/sgml/ltree.sgml          |  3 ++-
4 files changed, 27 insertions(+), 4 deletions(-)