Fix DROP DATABASE for databases with many ACLs

Commit c66a7d75e652 modified DROP DATABASE so that if interrupted, the
database is known to be in an invalid state and can only be dropped.
This is done by setting a flag using an in-place update, so that it's
not lost in case of rollback.

For databases with many ACLs, this may however fail like this:

  ERROR:  wrong tuple length

This happens because with many ACLs, the pg_database.datacl attribute
gets TOASTed. The dropdb() code reads the tuple from the syscache, which
means it's detoasted. But the in-place update expects the tuple length
to match the on-disk tuple.

Fixed by reading the tuple from the catalog directly, not from syscache.

Report and fix by Ayush Tiwari. Backpatch to 12. The DROP DATABASE fix
was backpatched to 11, but 11 is EOL at this point.

Reported-by: Ayush Tiwari
Author: Ayush Tiwari
Reviewed-by: Tomas Vondra
Backpatch-through: 12
Discussion: https://postgr.es/m/CAJTYsWWNkCt+-UnMhg=BiCD3Mh8c2JdHLofPxsW3m2dkDFw8RA@mail.gmail.com

diff --git a/src/backend/commands/dbcommands.c b/src/backend/commands/dbcommands.c
index d68a570ee158914374c75f0e57033ac778aa89d6..06b7506a3d220e0fbfd64fa6ddc93115feec77e6 100644 (file)
--- a/src/backend/commands/dbcommands.c
+++ b/src/backend/commands/dbcommands.c
@@ -827,6 +827,8 @@ dropdb(const char *dbname, bool missing_ok, bool force)
    bool        db_istemplate;
    Relation    pgdbrel;
    HeapTuple   tup;
+   ScanKeyData scankey;
+   SysScanDesc scan;
    Form_pg_database datform;
    int         notherbackends;
    int         npreparedxacts;
@@ -959,7 +961,18 @@ dropdb(const char *dbname, bool missing_ok, bool force)
     */
    dropDatabaseDependencies(db_id);
 
-   tup = SearchSysCacheCopy1(DATABASEOID, ObjectIdGetDatum(db_id));
+   /*
+    * Update the database's pg_database tuple
+    */
+   ScanKeyInit(&scankey,
+               Anum_pg_database_datname,
+               BTEqualStrategyNumber, F_NAMEEQ,
+               CStringGetDatum(dbname));
+
+   scan = systable_beginscan(pgdbrel, DatabaseNameIndexId, true,
+                             NULL, 1, &scankey);
+
+   tup = systable_getnext(scan);
    if (!HeapTupleIsValid(tup))
        elog(ERROR, "cache lookup failed for database %u", db_id);
    datform = (Form_pg_database) GETSTRUCT(tup);
@@ -985,6 +998,8 @@ dropdb(const char *dbname, bool missing_ok, bool force)
     */
    CatalogTupleDelete(pgdbrel, &tup->t_self);
 
+   systable_endscan(scan);
+
    /*
     * Drop db-specific replication slots.
     */