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PLyString_ToComposite() blithely overwrote proc->result.out.d, even though for a composite result type the other union variant proc->result.out.r is the one that should be valid. This could result in a crash if out.r had in fact been filled in (proc->result.is_rowtype == 1) and then somebody later attempted to use that data; as per bug #13579 from Paweł Michalak. Just to add insult to injury, it didn't work for RECORD results anyway, because record_in() would refuse the case. Fix by doing the I/O function lookup in a local PLyTypeInfo variable, as we were doing already in PLyObject_ToComposite(). This is not a great technique because any fn_extra data allocated by the input function will be leaked permanently (thanks to using TopMemoryContext as fn_mcxt). But that's a pre-existing issue that is much less serious than a crash, so leave it to be fixed separately. This bug would be a potential security issue, except that plpython is only available to superusers and the crash requires coding the function in a way that didn't work before today's patches. Add regression test cases covering all the supported methods of converting composite results. Back-patch to 9.1 where the faulty coding was introduced. |
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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: http://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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.