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The logic of xslt_process() has never considered the fact that xsltSaveResultToString() would return NULL for an empty string (the upstream code has always done so, with a string length of 0). This would cause memcpy() to be called with a NULL pointer, something forbidden by POSIX. Like 46ab07ffda9d and similar fixes, this is backpatched down to all the supported branches, with a test case to cover this scenario. An empty string has been always returned in xml2 in this case, based on the history of the module, so this is an old issue. Reported-by: Alexander Lakhin <exclusion@gmail.com> Discussion: https://postgr.es/m/c516a0d9-4406-47e3-9087-5ca5176ebcf9@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/.