From patchwork Mon Aug 2 13:45:11 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 490680 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3AC39C4338F for ; Mon, 2 Aug 2021 14:05:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 20A6F6023B for ; Mon, 2 Aug 2021 14:05:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235225AbhHBOFI (ORCPT ); Mon, 2 Aug 2021 10:05:08 -0400 Received: from mail.kernel.org ([198.145.29.99]:49762 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236343AbhHBOCK (ORCPT ); Mon, 2 Aug 2021 10:02:10 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 1645D61132; Mon, 2 Aug 2021 13:56:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1627912618; bh=LledJ40SuU6u/o005yaxGhJF2oQz7Xfix55IiIKMjXA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FzpEC9j1Bd+xUFAaUfENNA5qGJQ+D3n/6q+GbNM7YqqnYlCJYxwrswt3Ddoad0nOR 0t2LMpxlXmGtr4jTGQ34BcptlovActGglHJgztX6Z8AhjBJOj0IWUbeZgIWyYNwpQK M1mfzI2idkwF4jp/AWhwzT5qtJgwyKRHQd4YStcU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, John Fastabend , Andrii Nakryiko , Jakub Sitnicki , Martin KaFai Lau , Sasha Levin Subject: [PATCH 5.13 074/104] bpf, sockmap: Zap ingress queues after stopping strparser Date: Mon, 2 Aug 2021 15:45:11 +0200 Message-Id: <20210802134346.452247267@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210802134344.028226640@linuxfoundation.org> References: <20210802134344.028226640@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: John Fastabend [ Upstream commit 343597d558e79fe704ba8846b5b2ed24056b89c2 ] We don't want strparser to run and pass skbs into skmsg handlers when the psock is null. We just sk_drop them in this case. When removing a live socket from map it means extra drops that we do not need to incur. Move the zap below strparser close to avoid this condition. This way we stop the stream parser first stopping it from processing packets and then delete the psock. Fixes: a136678c0bdbb ("bpf: sk_msg, zap ingress queue on psock down") Signed-off-by: John Fastabend Signed-off-by: Andrii Nakryiko Acked-by: Jakub Sitnicki Acked-by: Martin KaFai Lau Link: https://lore.kernel.org/bpf/20210727160500.1713554-2-john.fastabend@gmail.com Signed-off-by: Sasha Levin --- net/core/skmsg.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/core/skmsg.c b/net/core/skmsg.c index b2410a1bfa23..45b3a3adc886 100644 --- a/net/core/skmsg.c +++ b/net/core/skmsg.c @@ -790,8 +790,6 @@ static void sk_psock_destroy(struct work_struct *work) void sk_psock_drop(struct sock *sk, struct sk_psock *psock) { - sk_psock_stop(psock, false); - write_lock_bh(&sk->sk_callback_lock); sk_psock_restore_proto(sk, psock); rcu_assign_sk_user_data(sk, NULL); @@ -801,6 +799,8 @@ void sk_psock_drop(struct sock *sk, struct sk_psock *psock) sk_psock_stop_verdict(sk, psock); write_unlock_bh(&sk->sk_callback_lock); + sk_psock_stop(psock, false); + INIT_RCU_WORK(&psock->rwork, sk_psock_destroy); queue_rcu_work(system_wq, &psock->rwork); }