{"id":2230381,"url":"http://patchwork.ozlabs.org/api/1.1/covers/2230381/?format=json","web_url":"http://patchwork.ozlabs.org/project/netfilter-devel/cover/20260429175613.1459342-1-tristmd@gmail.com/","project":{"id":26,"url":"http://patchwork.ozlabs.org/api/1.1/projects/26/?format=json","name":"Netfilter Development","link_name":"netfilter-devel","list_id":"netfilter-devel.vger.kernel.org","list_email":"netfilter-devel@vger.kernel.org","web_url":null,"scm_url":null,"webscm_url":null},"msgid":"<20260429175613.1459342-1-tristmd@gmail.com>","date":"2026-04-29T17:56:10","name":"[0/2] netfilter: fix NULL ops race in iptable lazy init","submitter":{"id":93179,"url":"http://patchwork.ozlabs.org/api/1.1/people/93179/?format=json","name":"Tristan Madani","email":"tristmd@gmail.com"},"mbox":"http://patchwork.ozlabs.org/project/netfilter-devel/cover/20260429175613.1459342-1-tristmd@gmail.com/mbox/","series":[{"id":502119,"url":"http://patchwork.ozlabs.org/api/1.1/series/502119/?format=json","web_url":"http://patchwork.ozlabs.org/project/netfilter-devel/list/?series=502119","date":"2026-04-29T17:56:10","name":"netfilter: fix NULL ops race in iptable lazy init","version":1,"mbox":"http://patchwork.ozlabs.org/series/502119/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/covers/2230381/comments/","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","netfilter-devel@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=TUoc0w6z;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c04:e001:36c::12fc:5321; helo=tor.lore.kernel.org;\n envelope-from=netfilter-devel+bounces-12301-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com\n header.b=\"TUoc0w6z\"","smtp.subspace.kernel.org;\n arc=none smtp.client-ip=209.85.221.50","smtp.subspace.kernel.org;\n dmarc=pass (p=none dis=none) header.from=gmail.com","smtp.subspace.kernel.org;\n spf=pass smtp.mailfrom=gmail.com"],"Received":["from tor.lore.kernel.org (tor.lore.kernel.org\n [IPv6:2600:3c04:e001:36c::12fc:5321])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g5Q3P4rhgz1xqf\n\tfor ; Thu, 30 Apr 2026 03:56:33 +1000 (AEST)","from smtp.subspace.kernel.org (conduit.subspace.kernel.org\n [100.90.174.1])\n\tby tor.lore.kernel.org (Postfix) with ESMTP id A9F5F3025170\n\tfor ; Wed, 29 Apr 2026 17:56:23 +0000 (UTC)","from localhost.localdomain (localhost.localdomain [127.0.0.1])\n\tby smtp.subspace.kernel.org (Postfix) with ESMTP id 73ABD41325C;\n\tWed, 29 Apr 2026 17:56:18 +0000 (UTC)","from mail-wr1-f50.google.com (mail-wr1-f50.google.com\n [209.85.221.50])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))\n\t(No client certificate requested)\n\tby smtp.subspace.kernel.org (Postfix) with ESMTPS id 6874538CFF1\n\tfor ; Wed, 29 Apr 2026 17:56:16 +0000 (UTC)","by mail-wr1-f50.google.com with SMTP id\n ffacd0b85a97d-43fe608cb92so48063f8f.2\n for ;\n Wed, 29 Apr 2026 10:56:16 -0700 (PDT)","from debian.. 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Only afterwards do they allocate the per-net copy of\nhook ops via kmemdup_array(). This leaves a window where the table is\nfindable via xt_find_table() but has ops=NULL.\n\nIf cleanup_net runs during this window (racing namespace teardown against\nlazy table init), ipt_unregister_table_pre_exit() /\nip6t_unregister_table_pre_exit() finds the table and passes the NULL ops\npointer to nf_unregister_net_hooks(), causing a general protection fault.\n\nFix both ip_tables.c and ip6_tables.c by moving the ops allocation\nbefore xt_register_table(), so the table is never in the list with a\nNULL ops pointer.\n\nTristan Madani (2):\n netfilter: ip_tables: allocate hook ops before making table visible\n netfilter: ip6_tables: allocate hook ops before making table visible\n\n net/ipv4/netfilter/ip_tables.c | 31 ++++++++++++++++---------------\n net/ipv6/netfilter/ip6_tables.c | 28 ++++++++++++++++------------\n 2 files changed, 32 insertions(+), 27 deletions(-)"}