a6eabec680
Various code paths of the ECPG code did not check for memory allocation failures, including the specific case where ecpg_strdup() considers a NULL value given in input as a valid behavior. strdup() returning itself NULL on failure, there was no way to make the difference between what could be valid and what should fail. With the different cases in mind, ecpg_strdup() is redesigned and gains a new optional argument, giving its callers the possibility to differentiate allocation failures and valid cases where the caller is giving a NULL value in input. Most of the ECPG code does not expect a NULL value, at the exception of ECPGget_desc() (setlocale) and ECPGconnect(), like dbname being unspecified, with repeated strdup calls. The code is adapted to work with this new routine. Note the case of ecpg_auto_prepare(), where the code order is switched so as we handle failures with ecpg_strdup() before manipulating any cached data, avoiding inconsistencies. This class of failure is unlikely a problem in practice, so no backpatch is done. Random OOM failures in ECPGconnect() could cause the driver to connect to a different server than the one wanted by the caller, because it could fallback to default values instead of the parameters defined depending on the combinations of allocation failures and successes. Author: Evgeniy Gorbanev <gorbanyoves@basealt.ru> Co-authored-by: Aleksander Alekseev <aleksander@tigerdata.com> Reviewed-by: Álvaro Herrera <alvherre@kurilemu.de> Reviewed-by: Michael Paquier <michael@paquier.xyz> Discussion: https://postgr.es/m/a6b193c1-6994-4d9c-9059-aca4aaf41ddd@basealt.ru |
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| configure | ||
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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.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.