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In get_perl_array_ref(), for a PostgreSQL::InServer::ARRAY object, we look up its "array" key with hv_fetch_string() and then inspect the returned SV. However, hv_fetch_string() returns a NULL pointer when the key is absent, and the code dereferenced that result without first checking whether the pointer itself was NULL. As a result, a plperl function returning a forged PostgreSQL::InServer::ARRAY object that lacks the "array" key would crash the backend with a segmentation fault. Fix this by checking the pointer returned by hv_fetch_string() before dereferencing it, matching how other callers in this file already guard the result. With the check in place, such an object falls through to the existing error report instead of crashing. Author: Xing Guo <higuoxing@gmail.com> Reviewed-by: Richard Guo <guofenglinux@gmail.com> Discussion: https://postgr.es/m/CACpMh+DYgcnqZwQLXXuxQcehJTd7T8UmKWSLsK4mFBEp9G2ajA@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/.