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In most scenarios a portal without a ResourceOwner is dead and not subject to any further execution, but a portal for a cursor WITH HOLD remains in existence with no ResourceOwner after the creating transaction is over. In this situation, if we attempt to "execute" the portal directly to fetch data from it, we were setting CurrentResourceOwner to NULL, leading to a segfault if the datatype output code did anything that required a resource owner (such as trying to fetch system catalog entries that weren't already cached). The case appears to be impossible to provoke with stock libpq, but psqlODBC at least is able to cause it when working with held cursors. Simplest fix is to just skip the assignment to CurrentResourceOwner, so that any resources used by the data output operations will be managed by the transaction-level resource owner instead. For consistency I changed all the places that install a portal's resowner as current, even though some of them are probably not reachable with a held cursor's portal. Per report from Joshua Berry (with thanks to Hiroshi Inoue for developing a self-contained test case). Back-patch to all supported versions. |
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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. Changes between all PostgreSQL releases are recorded in the file HISTORY. 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/.