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One of the error paths left *members uninitialized. That's not a live bug, because most callers don't look at *members when the function returns -1, but let's be tidy. One caller, in heap_lock_tuple(), does "if (members != NULL) pfree(members)", but AFAICS it never passes an invalid 'multi' value so it should not reach that error case. The callers are also a bit inconsistent in their expectations. heap_lock_tuple() pfrees the 'members' array if it's not-NULL, others pfree() it if "nmembers >= 0", and others if "nmembers > 0". That's not a live bug either, because the function should never return 0, but add an Assert for that to make it more clear. I left the callers alone for now. I also moved the line where we set *nmembers. It wasn't wrong before, but I like to do that right next to the 'return' statement, to make it clear that it's always set on return. Also remove one unreachable return statement after ereport(ERROR), for brevity and for consistency with the similar if-block right after it. Author: Greg Nancarrow with the additional changes by me Backpatch-through: 9.6, all supported versions
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/.