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Commitc015560

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Don't access catalogs to validate GUCs when not connected to a DB.
Vignesh found this bug in the check function fordefault_table_access_method's check hook, but that was just copiedfrom older GUCs. Investigation by Michael and me then found the bug infurther places.When not connected to a database (e.g. in a walsender connection), wecannot perform (most) GUC checks that need database access. Even whenonly shared tables are needed, unless they'renailed (c.f. RelationCacheInitializePhase2()), they cannot be accessedwithout pg_class etc. being present.Fix by extending the existing IsTransactionState() checks to alsocheck for MyDatabaseOid.Reported-By: Vignesh C, Michael Paquier, Andres FreundAuthor: Vignesh C, Andres FreundDiscussion:https://postgr.es/m/CALDaNm1KXK9gbZfY-p_peRFm_XrBh1OwQO1Kk6Gig0c0fVZ2uw%40mail.gmail.comBackpatch: 9.4-
1 parent6a781c4 commitc015560

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2 files changed

+13
-9
lines changed

2 files changed

+13
-9
lines changed

‎src/backend/commands/tablespace.c‎

Lines changed: 8 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -1064,10 +1064,11 @@ bool
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check_default_tablespace(char**newval,void**extra,GucSourcesource)
10651065
{
10661066
/*
1067-
* If we aren't inside a transaction, we cannot do database access so
1068-
* cannot verify the name. Must accept the value on faith.
1067+
* If we aren't inside a transaction, or connected to a database, we
1068+
* cannot do the catalog accesses necessary to verify the name. Must
1069+
* accept the value on faith.
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*/
1070-
if (IsTransactionState())
1071+
if (IsTransactionState()&&MyDatabaseId!=InvalidOid)
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{
10721073
if (**newval!='\0'&&
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!OidIsValid(get_tablespace_oid(*newval, true)))
@@ -1175,11 +1176,12 @@ check_temp_tablespaces(char **newval, void **extra, GucSource source)
11751176
}
11761177

11771178
/*
1178-
* If we aren't inside a transaction, we cannot do database access so
1179-
* cannot verify the individual names. Must accept the list on faith.
1179+
* If we aren't inside a transaction, or connected to a database, we
1180+
* cannot do the catalog accesses necessary to verify the name. Must
1181+
* accept the value on faith.
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* Fortunately, there's then also no need to pass the data to fd.c.
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*/
1182-
if (IsTransactionState())
1184+
if (IsTransactionState()&&MyDatabaseId!=InvalidOid)
11831185
{
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temp_tablespaces_extra*myextra;
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Oid*tblSpcs;

‎src/backend/utils/cache/ts_cache.c‎

Lines changed: 5 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -38,6 +38,7 @@
3838
#include"catalog/pg_ts_parser.h"
3939
#include"catalog/pg_ts_template.h"
4040
#include"commands/defrem.h"
41+
#include"miscadmin.h"
4142
#include"tsearch/ts_cache.h"
4243
#include"utils/builtins.h"
4344
#include"utils/catcache.h"
@@ -591,10 +592,11 @@ bool
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check_TSCurrentConfig(char**newval,void**extra,GucSourcesource)
592593
{
593594
/*
594-
* If we aren't inside a transaction, we cannot do database access so
595-
* cannot verify the config name. Must accept it on faith.
595+
* If we aren't inside a transaction, or connected to a database, we
596+
* cannot do the catalog accesses necessary to verify the config name.
597+
* Must accept it on faith.
596598
*/
597-
if (IsTransactionState())
599+
if (IsTransactionState()&&MyDatabaseId!=InvalidOid)
598600
{
599601
OidcfgId;
600602
HeapTupletuple;

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