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tsearch_readline() saves the string pointer it returns to the caller for possible use in the associated error context callback. However, the caller will usually pfree that string sometime before it next calls tsearch_readline(), so that there is a window where an ereport will try to print an already-freed string. The built-in users of tsearch_readline() happen to all do that pfree at the bottoms of their loops, so that the window is effectively empty for them. However, this is not documented as a requirement, and contrib/dict_xsyn doesn't do it like that, so it seems likely that third-party dictionaries might have live bugs here. The practical consequences of this seem pretty limited in any case, since production builds wouldn't clobber the freed string immediately, besides which you'd not expect syntax errors in dictionary files being used in production. Still, it's clearly a bug waiting to bite somebody. Fix by pstrdup'ing the string to be saved for the error callback, and then pfree'ing it next time through. It's been like this for a long time, so back-patch to all supported branches. Discussion: https://postgr.es/m/48A4FA71-524E-41B9-953A-FD04EF36E2E7@yesql.se
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.