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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2022-10-17 11:35:23 -0400 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2022-10-17 11:35:23 -0400 |
| commit | 99b6b705d439fbf72aefe968941f38d571b9231c (patch) | |
| tree | 1d79a3557731df59cdd733d59fe7deabd6bd91ba /src | |
| parent | 3d7df87c4bba27f1d1dcc5d92e7997b82cedd458 (diff) | |
| download | postgresql-99b6b705d439fbf72aefe968941f38d571b9231c.tar.gz postgresql-99b6b705d439fbf72aefe968941f38d571b9231c.zip | |
Guard against table-AM-less relations in planner.
The executor will dump core if it's asked to execute a seqscan on
a relation having no table AM, such as a view. While that shouldn't
really happen, it's possible to get there via catalog corruption,
such as a missing ON SELECT rule. It seems worth installing a defense
against that. There are multiple plausible places for such a defense,
but I picked the planner's get_relation_info().
Per discussion of bug #17646 from Kui Liu. Back-patch to v12 where
the tableam APIs were introduced; in older versions you won't get a
SIGSEGV, so it seems less pressing.
Discussion: https://postgr.es/m/17646-70c93cfa40365776@postgresql.org
Diffstat (limited to 'src')
| -rw-r--r-- | src/backend/optimizer/util/plancat.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/backend/optimizer/util/plancat.c b/src/backend/optimizer/util/plancat.c index bdb2f164295..d163cc45c4b 100644 --- a/src/backend/optimizer/util/plancat.c +++ b/src/backend/optimizer/util/plancat.c @@ -123,6 +123,22 @@ get_relation_info(PlannerInfo *root, Oid relationObjectId, bool inhparent, */ relation = table_open(relationObjectId, NoLock); + /* + * Relations without a table AM can be used in a query only if they are of + * special-cased relkinds. This check prevents us from crashing later if, + * for example, a view's ON SELECT rule has gone missing. Note that + * table_open() already rejected indexes and composite types. + */ + if (!relation->rd_tableam) + { + if (!(relation->rd_rel->relkind == RELKIND_FOREIGN_TABLE || + relation->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)) + ereport(ERROR, + (errcode(ERRCODE_WRONG_OBJECT_TYPE), + errmsg("cannot open relation \"%s\"", + RelationGetRelationName(relation)))); + } + /* Temporary and unlogged relations are inaccessible during recovery. */ if (!RelationNeedsWAL(relation) && RecoveryInProgress()) ereport(ERROR, |