From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5A05EEB64DC for ; Mon, 17 Jul 2023 23:33:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231423AbjGQXdD (ORCPT ); Mon, 17 Jul 2023 19:33:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48626 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230081AbjGQXdC (ORCPT ); Mon, 17 Jul 2023 19:33:02 -0400 Received: from Chamillionaire.breakpoint.cc (Chamillionaire.breakpoint.cc [IPv6:2a0a:51c0:0:237:300::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 174441B5 for ; Mon, 17 Jul 2023 16:32:13 -0700 (PDT) Received: from fw by Chamillionaire.breakpoint.cc with local (Exim 4.92) (envelope-from ) id 1qLXfz-0001Op-4P; Tue, 18 Jul 2023 01:30:47 +0200 From: Florian Westphal To: Cc: Florian Westphal Subject: [PATCH nf] netfilter: nf_tables: can't schedule in nft_chain_validate Date: Tue, 18 Jul 2023 01:30:33 +0200 Message-ID: <20230717233036.26472-1-fw@strlen.de> X-Mailer: git-send-email 2.41.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netfilter-devel@vger.kernel.org Can be called via nft set element list iteration, which may acquire rcu and/or bh read lock (depends on set type). BUG: sleeping function called from invalid context at net/netfilter/nf_tables_api.c:3353 in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 1232, name: nft preempt_count: 0, expected: 0 RCU nest depth: 1, expected: 0 2 locks held by nft/1232: #0: ffff8881180e3ea8 (&nft_net->commit_mutex){+.+.}-{3:3}, at: nf_tables_valid_genid #1: ffffffff83f5f540 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire Call Trace: nft_chain_validate nft_lookup_validate_setelem nft_pipapo_walk nft_lookup_validate nft_chain_validate nft_immediate_validate nft_chain_validate nf_tables_validate nf_tables_abort No choice but to move it to nf_tables_validate(). Fixes: 81ea01066741 ("netfilter: nf_tables: add rescheduling points during loop detection walks") Signed-off-by: Florian Westphal --- net/netfilter/nf_tables_api.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index 237f739da3ca..f12164df1f27 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -3685,8 +3685,6 @@ int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain) if (err < 0) return err; } - - cond_resched(); } return 0; @@ -3710,6 +3708,8 @@ static int nft_table_validate(struct net *net, const struct nft_table *table) err = nft_chain_validate(&ctx, chain); if (err < 0) return err; + + cond_resched(); } return 0; -- 2.41.0