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substring(), and perhaps other callers, isn't careful to pass a slice length that is no more than the datum's true size. Since toast_decompress_datum_slice's children will palloc the requested slice length, this can waste memory. Also, close study of the liblz4 documentation suggests that it is dependent on the caller to not ask for more than the correct amount of decompressed data; this squares with observed misbehavior with liblz4 1.8.3. Avoid these problems by switching to the normal full-decompression code path if the slice request is >= datum's decompressed size. Tom Lane and Dilip Kumar Discussion: https://postgr.es/m/507597.1616370729@sss.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. 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/.