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Fix assorted syscache lookup sloppiness in partition-related code.

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heap_drop_with_catalog and ATExecDetachPartition neglected to check for
SearchSysCache failures, as noted in bugs #14927 and #14928 from Pan Bian.
Such failures are pretty unlikely, since we should already have some sort
of lock on the rel at these points, but it's neither a good idea nor
per project style to omit a check for failure.

Also, StorePartitionKey contained a syscache lookup that it never did
anything with, including never releasing the result.  Presumably the
reason why we don't see refcount-leak complaints is that the lookup
always fails; but in any case it's pretty useless, so remove it.

All of these errors were evidently introduced by the relation
partitioning feature.  Back-patch to v10 where that came in.

Amit Langote and Tom Lane

Discussion: https://postgr.es/m/20171127090105.1463.3962@wrigleys.postgresql.org
Discussion: https://postgr.es/m/20171127091341.1468.72696@wrigleys.postgresql.org
This commit is contained in:
Tom Lane 2017-11-27 19:22:08 -05:00
parent 9a785ad573
commit cb03fa33ae
2 changed files with 5 additions and 3 deletions
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5
src/backend/catalog/heap.c
View File

@ -1772,6 +1772,8 @@ heap_drop_with_catalog(Oid relid)
* shared-cache-inval notice that will make them update their index lists.
*/
tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relid));
if (!HeapTupleIsValid(tuple))
elog(ERROR, "cache lookup failed for relation %u", relid);
if (((Form_pg_class) GETSTRUCT(tuple))->relispartition)
{
parentOid = get_partition_parent(relid);
@ -3131,9 +3133,6 @@ StorePartitionKey(Relation rel,
Assert(rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
tuple = SearchSysCache1(PARTRELID,
ObjectIdGetDatum(RelationGetRelid(rel)));
/* Copy the partition attribute numbers, opclass OIDs into arrays */
partattrs_vec = buildint2vector(partattrs, partnatts);
partopclass_vec = buildoidvector(partopclass, partnatts);

3
src/backend/commands/tablecmds.c
View File

@ -14111,6 +14111,9 @@ ATExecDetachPartition(Relation rel, RangeVar *name)
classRel = heap_open(RelationRelationId, RowExclusiveLock);
tuple = SearchSysCacheCopy1(RELOID,
ObjectIdGetDatum(RelationGetRelid(partRel)));
if (!HeapTupleIsValid(tuple))
elog(ERROR, "cache lookup failed for relation %u",
RelationGetRelid(partRel));
Assert(((Form_pg_class) GETSTRUCT(tuple))->relispartition);
(void) SysCacheGetAttr(RELOID, tuple, Anum_pg_class_relpartbound,