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Commit46b4f5c11bmade the logical replication origin checks quote the schema and relation names they interpolate into the query sent to the publisher. Those names can be NULL, which that commit overlooked. AlterSubscription_refresh() collects the OIDs of the relations already present in pg_subscription_rel and hands them to check_publications_origin_tables() and check_publications_origin_sequences(), which append the schema-qualified name of each one to the query so that already-subscribed relations are excluded from the check. The relations are never locked, so one of them can be dropped concurrently before its name is read, and get_rel_name() and get_namespace_name() return NULL. quote_literal_cstr() dereferences it and crashes the backend. This commit fixes this by skipping a relation whose name is no longer available. A dropped relation is not synchronized anyway, and the appended clauses only exclude relations from a check whose sole effect is a WARNING, so omitting one can at most produce a spurious WARNING. The window is reachable from ALTER SUBSCRIPTION ... REFRESH PUBLICATION and from SET, ADD and DROP PUBLICATION, which refresh by default, but only when copy_data is true and origin is none. Backpatch to v16 as commit46b4f5c11bwas back-patched that far. The sequence path exists only in v19 and later. The test is applied to v19 and later only. Adding it to v17 and v18 would require enabling injection point support in src/test/subscription there, and v16 predates injection points entirely. That is more test infrastructure churn on stable branches than this fix warrants. Reported-by: SATYANARAYANA NARLAPURAM <satyanarlapuram@gmail.com> Author: SATYANARAYANA NARLAPURAM <satyanarlapuram@gmail.com> Co-authored-by: Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com> Reviewed-by: Ajin Cherian <itsajin@gmail.com> Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com> Discussion: https://postgr.es/m/CAHg+QDcd_o3707Ey8c8b7HkE-t14g8c0tk8ME3ctywDsh3ut8g@mail.gmail.com Backpatch-through: 16
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/.