From: Jeff Davis <jdavis@postgresql.org>
Date: Mon, 8 Jun 2026 20:10:40 +0000 (-0700)
Subject: Guard against uninitialized default locale.
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=1c77203c15e43d4ae9a8fed67ce89eeeca54af8f;p=thirdparty%2Fpostgresql.git

Guard against uninitialized default locale.

No known problem today, but defend against issues like dbf217c1c7 in
the future.

Discussion: https://postgr.es/m/d080287d8d2d14c246c86be2e9eb611fb6b27b11.camel@j-davis.com
Reviewed-by: Ayush Tiwari <ayushtiwari.slg01@gmail.com>
Backpatch-through: 17
---

diff --git a/src/backend/utils/adt/pg_locale.c b/src/backend/utils/adt/pg_locale.c
index 3f1fb9fafd9..11d48a3916e 100644
--- a/src/backend/utils/adt/pg_locale.c
+++ b/src/backend/utils/adt/pg_locale.c
@@ -1192,7 +1192,13 @@ pg_newlocale_from_collation(Oid collid)
 	bool		found;
 
 	if (collid == DEFAULT_COLLATION_OID)
+	{
+		/* should not happen: init_database_collation() not yet run */
+		if (default_locale == NULL)
+			elog(ERROR, "default locale not initialized");
+
 		return default_locale;
+	}
 
 	/*
 	 * Some callers expect C_COLLATION_OID to succeed even without catalog