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Before this patch, there was some code that tried to make sure that the buffer was always big enough at the start, and then asserted that it didn't need to be enlarged later. However, the code to make sure it was big enough at the start doesn't actually work, and therefore it was possible to fail an assertion and crash later. Remove the code that tries to make sure the buffer is always big enough at the start in favor of enlarging the buffer as we go along whenever that is necessary. The mistake probably happened because, on the server side, we do actually need to guarantee that the buffer is big enough at the start to avoid subsequent resizings. However, in that case, the calling code makes promises about how much data it will provide at once, but here, that's not the case. Report by Justin Pryzby. Analysis by me. Patch by Dipesh Pandit. Discussion: http://postgr.es/m/20220330143536.GG28503@telsasoft.com |
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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/.