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An out-of-memory failure happening when allocating the structures to store the connection parameter keywords and values would mess up with the set of connections saved, as on failure the pthread mutex would still be hold with the new connection object listed but free()'d. Rather than just unlocking the mutex, which would leave the static list of connections into an inconsistent state, move the allocation for the structures of the connection parameters before beginning the test manipulation. This ensures that the list of connections and the connection mutex remain consistent all the time in this code path. This error is unlikely going to happen, but this could mess up badly with ECPG clients in surprising ways, so backpatch all the way down. Reported-by: ryancaicse Discussion: https://postgr.es/m/17186-b4cfd8f0eb4d1dee@postgresql.org Backpatch-through: 9.6 |
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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/.