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GetNamedDSMSegment() doesn't check whether dsm_attach() returns NULL, which creates the possibility of a NULL pointer dereference soon after. To fix, emit an ERROR if dsm_attach() returns NULL. This shouldn't happen, but it would be nice to avoid a segfault if it does. In passing, tidy up the surrounding code. Reported-by: Tom Lane Reviewed-by: Michael Paquier, Bharath Rupireddy Discussion: https://postgr.es/m/3348869.1705854106%40sss.pgh.pa.us
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. Copyright and license information can be found in the file COPYRIGHT. General documentation about this version of PostgreSQL can be found at: https://www.postgresql.org/docs/devel/ In particular, information about building PostgreSQL from the source code can be found at: https://www.postgresql.org/docs/devel/installation.html The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.