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b72a44c51a
slot_modify_cstrings seriously abused the TupleTableSlot API by relying on a slot's underlying data to stay valid across ExecClearTuple. Since this abuse was also quite undocumented, it's little surprise that the case got broken during the v12 slot rewrites. As reported in bug #16129 from Ondřej Jirman, this could lead to crashes or data corruption when a logical replication subscriber processes a row update. Problems would only arise if the subscriber's table contained columns of pass-by-ref types that were not being copied from the publisher. Fix by explicitly copying the datum/isnull arrays from the source slot that the old row was in already. This ends up being about the same thing that happened pre-v12, but hopefully in a less opaque and fragile way. We might've caught the problem sooner if there were any test cases dealing with updates involving non-replicated or dropped columns. Now there are. Back-patch to v10 where this code came in. Even though the failure does not manifest before v12, IMO this code is too fragile to leave as-is. In any case we certainly want the additional test coverage. Patch by me; thanks to Tomas Vondra for initial investigation. Discussion: https://postgr.es/m/16129-a0c0f48e71741e5f@postgresql.org |
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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/.