e73e0196d3
ri_FastPathCheck() read riinfo->fpmeta again after ri_CheckFunctionPermissions(), which looks up catalog entries and so can process invalidation messages. If one of them reaches InvalidateConstraintCacheCallBack() for the constraint, as a pg_amop change or a cache reset would, the callback detaches the metadata and sets riinfo->fpmeta to NULL, which build_index_scankeys() then dereferences. The callback already defers freeing detached metadata until AtEOXact_RI(), and its comment assumes callers keep their own pointer to it, so use a local pointer instead of riinfo->fpmeta. There is no test, as hitting this needs an invalidation to arrive during those catalog lookups. Discussion: https://postgr.es/m/CA+HiwqFaipkMsZ8XP-9sMk21h0Q7rih=NpJQXsBAaD39VtnrOA@mail.gmail.com
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/.