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psql_scan_slash_command() builds the command name in a local PQExpBufferData and returns the buffer's data pointer to its caller. If either the initial allocation or a later enlargement failed, that data pointer could be the static PQExpBuffer OOM buffer rather than malloc-owned storage. HandleSlashCmds() could then eventually pass it to free(), causing undefined behavior. Detect a broken command-name buffer before returning it, report OOM, and return NULL instead. Teach HandleSlashCmds() to treat a NULL command name as a command error before trying to compare or dispatch it. Backpatch to all supported versions. Reported-by: Junwang Zhao <zhjwpku@gmail.com> Author: Fujii Masao <masao.fujii@gmail.com> Reviewed-by: Chao Li <li.evan.chao@gmail.com> Reviewed-by: Junwang Zhao <zhjwpku@gmail.com> Discussion: https://postgr.es/m/CAHGQGwEh3R3=1tx_a5=fTDJ+ycuwxWMEn6bG_Yt4B5P+hE7AVw@mail.gmail.com Backpatch-through: 14
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/.