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Fix assorted silliness in ATExecSetCompression(). 

It's not okay to scribble directly on a syscache entry.
Nor to continue accessing said entry after releasing it.

Also get rid of not-used local variables.

Per valgrind testing.
This commit is contained in:
Tom Lane 2021-03-21 18:42:40 -04:00
parent 9dd963ae25
commit ac897c4834
1 changed files with 12 additions and 14 deletions
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26
src/backend/commands/tablecmds.c
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@ -15071,9 +15071,6 @@ ATExecSetCompression(AlteredTableInfo *tab,
char *compression;
char typstorage;
Oid cmoid;
Datum values[Natts_pg_attribute];
bool nulls[Natts_pg_attribute];
bool replace[Natts_pg_attribute];
ObjectAddress address;
Assert(IsA(newValue, String));
@ -15081,7 +15078,8 @@ ATExecSetCompression(AlteredTableInfo *tab,
attrel = table_open(AttributeRelationId, RowExclusiveLock);
tuple = SearchSysCacheAttName(RelationGetRelid(rel), column);
/* copy the cache entry so we can scribble on it below */
tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), column);
if (!HeapTupleIsValid(tuple))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_COLUMN),
@ -15105,32 +15103,32 @@ ATExecSetCompression(AlteredTableInfo *tab,
errmsg("column data type %s does not support compression",
format_type_be(atttableform->atttypid))));
/* initialize buffers for new tuple values */
memset(values, 0, sizeof(values));
memset(nulls, false, sizeof(nulls));
memset(replace, false, sizeof(replace));
/* get the attribute compression method. */
cmoid = GetAttributeCompression(atttableform, compression);
/* update pg_attribute entry */
atttableform->attcompression = cmoid;
CatalogTupleUpdate(attrel, &tuple->t_self, tuple);
InvokeObjectPostAlterHook(RelationRelationId,
RelationGetRelid(rel),
atttableform->attnum);
attnum);
ReleaseSysCache(tuple);
/* apply changes to the index column as well */
/*
* Apply the change to indexes as well (only for simple index columns,
* matching behavior of index.c ConstructTupleDescriptor()).
*/
SetIndexStorageProperties(rel, attrel, attnum, cmoid, '\0', lockmode);
heap_freetuple(tuple);
table_close(attrel, RowExclusiveLock);
/* make changes visible */
CommandCounterIncrement();
ObjectAddressSubSet(address, RelationRelationId,
RelationGetRelid(rel), atttableform->attnum);
RelationGetRelid(rel), attnum);
return address;
}