Validate ispell dictionaries more carefully

Enterprise / PostgreSQL - Tom Lane [sss.pgh.pa.us] - 2 November 2019 20:45 EDT

Using incorrect, or just mismatched, dictionary and affix files could result in a crash, due to failure to cross-check offsets obtained from the file. Add necessary validation, as well as some Asserts for future-proofing.

Per bug #16050 from Alexander Lakhin. Back-patch to 9.6 where the problem was introduced.

Arthur Zakirov, per initial investigation by Tomas Vondra

Discussion: https://postgr.es/m/16050-024ae722464ab604@postgresql.org Discussion: https://postgr.es/m/20191013012610.2p2fp3zzpoav7jzf@development

8af1624e3f Validate ispell dictionaries more carefully.
src/backend/tsearch/spell.c | 25 ++++++++++++++++++++---
src/test/regress/expected/tsdicts.out | 34 ++++++++++++++++++++++++++++++++
src/test/regress/sql/tsdicts.sql | 37 +++++++++++++++++++++++++++++++++++
3 files changed, 93 insertions(+), 3 deletions(-)

Upstream: git.postgresql.org


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