Horton

Validate ispell dictionaries more carefully.

Tom Lane <tgl@sss.pgh.pa.us>

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Commit: 680aabd2f9e88a1cb9e4808682a00ad50c2acf52
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2019-11-02T20:45:32Z
Releases: 10.11 
Validate ispell dictionaries more carefully.

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

Files

PathChange+/−
src/backend/tsearch/spell.c modified +22 −3
src/test/regress/expected/tsdicts.out modified +34 −0
src/test/regress/sql/tsdicts.sql modified +37 −0

Discussion