Don't access catalogs to validate GUCs when not connected to a DB.

Vignesh found this bug in the check function for
default_table_access_method's check hook, but that was just copied
from older GUCs. Investigation by Michael and me then found the bug in
further places.

When not connected to a database (e.g. in a walsender connection), we
cannot perform (most) GUC checks that need database access. Even when
only shared tables are needed, unless they're
nailed (c.f. RelationCacheInitializePhase2()), they cannot be accessed
without pg_class etc. being present.

Fix by extending the existing IsTransactionState() checks to also
check for MyDatabaseOid.

Reported-By: Vignesh C, Michael Paquier, Andres Freund
Author: Vignesh C, Andres Freund
Discussion: https://postgr.es/m/CALDaNm1KXK9gbZfY-p_peRFm_XrBh1OwQO1Kk6Gig0c0fVZ2uw%40mail.gmail.com
Backpatch: 9.4-

diff --git a/src/backend/commands/tablespace.c b/src/backend/commands/tablespace.c
index 2b21edb8403c43d9b72a19c9fa2721026d8747fd..bf0a51cf7fdf5e140cd1806d815110143aa387fb 100644 (file)
--- a/src/backend/commands/tablespace.c
+++ b/src/backend/commands/tablespace.c
@@ -1066,10 +1066,11 @@ bool
 check_default_tablespace(char **newval, void **extra, GucSource source)
 {
        /*
-        * If we aren't inside a transaction, we cannot do database access so
-        * cannot verify the name.  Must accept the value on faith.
+        * If we aren't inside a transaction, or connected to a database, we
+        * cannot do the catalog accesses necessary to verify the name.  Must
+        * accept the value on faith.
         */
-       if (IsTransactionState())
+       if (IsTransactionState() && MyDatabaseId != InvalidOid)
        {
                if (**newval != '\0' &&
                        !OidIsValid(get_tablespace_oid(*newval, true)))
@@ -1177,11 +1178,12 @@ check_temp_tablespaces(char **newval, void **extra, GucSource source)
        }
 
        /*
-        * If we aren't inside a transaction, we cannot do database access so
-        * cannot verify the individual names.  Must accept the list on faith.
+        * If we aren't inside a transaction, or connected to a database, we
+        * cannot do the catalog accesses necessary to verify the name.  Must
+        * accept the value on faith.
         * Fortunately, there's then also no need to pass the data to fd.c.
         */
-       if (IsTransactionState())
+       if (IsTransactionState() && MyDatabaseId != InvalidOid)
        {
                temp_tablespaces_extra *myextra;
                Oid                *tblSpcs;

diff --git a/src/backend/utils/cache/ts_cache.c b/src/backend/utils/cache/ts_cache.c
index 5b1c358626752e04069bf7399473583074ab585c..8bc2ca98ecf3f9a08d02a2d179d0fa44d9f242f8 100644 (file)
--- a/src/backend/utils/cache/ts_cache.c
+++ b/src/backend/utils/cache/ts_cache.c
@@ -38,6 +38,7 @@
 #include "catalog/pg_ts_parser.h"
 #include "catalog/pg_ts_template.h"
 #include "commands/defrem.h"
+#include "miscadmin.h"
 #include "tsearch/ts_cache.h"
 #include "utils/builtins.h"
 #include "utils/catcache.h"
@@ -588,10 +589,11 @@ bool
 check_TSCurrentConfig(char **newval, void **extra, GucSource source)
 {
        /*
-        * If we aren't inside a transaction, we cannot do database access so
-        * cannot verify the config name.  Must accept it on faith.
+        * If we aren't inside a transaction, or connected to a database, we
+        * cannot do the catalog accesses necessary to verify the config name.
+        * Must accept it on faith.
         */
-       if (IsTransactionState())
+       if (IsTransactionState() && MyDatabaseId != InvalidOid)
        {
                Oid                     cfgId;
                HeapTuple       tuple;