Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1wNe6t-000xb6-2h for pgsql-hackers@arkaria.postgresql.org; Thu, 14 May 2026 22:00:51 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.96) (envelope-from ) id 1wNe6s-00FLaS-1t for pgsql-hackers@arkaria.postgresql.org; Thu, 14 May 2026 22:00:50 +0000 Received: from makus.postgresql.org ([2001:4800:3e1:1::229]) by malur.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1wNe6s-00FLaK-12 for pgsql-hackers@lists.postgresql.org; Thu, 14 May 2026 22:00:50 +0000 Received: from mail-dy1-x1333.google.com ([2607:f8b0:4864:20::1333]) by makus.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.98.2) (envelope-from ) id 1wNe6q-00000000bXZ-3COC for pgsql-hackers@postgresql.org; Thu, 14 May 2026 22:00:49 +0000 Received: by mail-dy1-x1333.google.com with SMTP id 5a478bee46e88-2b4520f6b32so14075344eec.0 for ; Thu, 14 May 2026 15:00:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=j-davis-com.20251104.gappssmtp.com; s=20251104; t=1778796048; x=1779400848; darn=postgresql.org; h=mime-version:user-agent:content-transfer-encoding:references :in-reply-to:date:to:from:subject:message-id:from:to:cc:subject:date :message-id:reply-to; bh=HK1a02/OME0KhcQ5Zpck4j4MIzrMXQwbaRS528CsyBQ=; b=nuGeCq+rl2+tlcHwO18kTv+9uD2mA8qYsVzUm0tXmgsoA/DrxoL79//PDfhdlFwz2L KoVmPGz+DW6x9eMXlL8yWS7h3ABKvHo2HZkBQbRx3NRArx/xYKe3DTs51ch8Eknsy5aN Boa8vlSW8AGKsI8YU+wDR+yPm7gyESuB3t6he6ezDQVgsZyRJjB5qLzdXiCUdSXs7n1Q SmL8Zofyt/thLYHEB36AFSbUGxtKSXQs9ca5Kr9ItBd/If7I2m/yojyKGDVHMK1BR9N0 8gA3gZ34ZyTH1Otc063pZUJsJHw7//yIbM7C590Vly1lIFNhP8yUhyIEBf7dmJCawe0O 1ARg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1778796048; x=1779400848; h=mime-version:user-agent:content-transfer-encoding:references :in-reply-to:date:to:from:subject:message-id:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=HK1a02/OME0KhcQ5Zpck4j4MIzrMXQwbaRS528CsyBQ=; b=Qkiq45Sc9cnX7gailUuexpbAx1wSPqPdrpmV6q2BYgcR1e6g4ZQsv2YmOH2KlC46yF TRKl/jbXkgcpYBR/y6SjCUcek6AnbGWV2/dsZvtpkng9S3jhEQ56TSEwnkZxRha8HQ8l erLdGWo2lU4wMBFXqq+8b3Os30PovsT0ZFs6hcJ1ZvSULizBb7XVmH5YBAreIa3sNNxf hL9y1KJOe3an6jMeIuTO1y1U7t7OrlEcSwVSTmZW4iBUMz2ysYIJXrCLdj93bAIPadTh APmxixoANTHqkuWYmiwDiLonlPZzij0nm2oeMu5vqK5Hh7fCdPOVy8bqBqnLSyYtSg43 TbJw== X-Gm-Message-State: AOJu0YwZ/Q5hh90EmELU/9Gyc1zZ/90K8mMa6z/CTnSIDDj8CBSmU7sZ /MT3JzvgXZxuHyMWvxAweFx3b6kNUYrFF1gU78z6wx6iBsYOha8LqIvGt4/hQdn+4L8oTjJ/kUE Ci28= X-Gm-Gg: Acq92OFO5BB/ZVv78n1ik2iOBgc/3k35TUcMJZeXlSs4H6RLgGk62D32Rg5Bpf6bS69 GpVP2yWQoeLuzgu0p0GRE1fZEjid6POhvdOvkYhqbkz97gzOXTdP0p5FZ2hs5pBrbf7tNW++Q0R M9aoqNiBRMLF3SUyGeLHC7XTGZVp2h1xcOPo+cAxpf18UgOQ2BJE8D4Wft8Xb2tE5d5ubl8TepD Pl3vvtl6AnmQ21/7N3qg0Givc8eljACwWpmfLho1t39KAjpcaPFH3mkKaPvSZB+xV9N9rEgD8GD txBkKrVE9dj20bDeNJXvfavNilrCewB+/MWJmti/vayUsKZRbfW6OKs2890U42NHY9ilOKuuAa6 iYSJxvERwj+CGEKMscEcUmozFGe2KUmJZtId3GSrYNw6qqbIJRQBXteHP7xmPgCS75hTi41mEHp AW/KpZRKp75BkVcEvdwt+hlx78nXPm69w= X-Received: by 2002:a05:7300:a146:b0:2e2:27bb:a48c with SMTP id 5a478bee46e88-3039816db2amr673360eec.14.1778796047527; Thu, 14 May 2026 15:00:47 -0700 (PDT) Received: from [10.10.241.5] ([12.63.242.122]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-30293e2e3c0sm5645368eec.3.2026.05.14.15.00.46 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 14 May 2026 15:00:46 -0700 (PDT) Message-ID: <497296e5b4ccdcbec80607beda7f18abbcc1a254.camel@j-davis.com> Subject: Re: Add a guard against uninitialized default locale From: Jeff Davis To: pgsql-hackers@postgresql.org Date: Thu, 14 May 2026 15:00:46 -0700 In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.52.3-0ubuntu1.1 MIME-Version: 1.0 List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk On Fri, 2026-04-24 at 15:44 -0700, Jeff Davis wrote: > Not known to be reachable after dbf217c1c7, but defend against > similar > issues in the future. For instance, an extension might encounter the > problem by calling pg_newlocale_from_collation(DEFAULT_COLLATION_OID) > from _PG_init(), and end up with a NULL pointer dereference. >=20 > Backport through 17, though patch is different in 17 (also attached). I plan to commit and backport this soon. Regards, Jeff Davis