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 X-Spam-Level: X-Spam-Status: No, score=-13.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 4F645C433DF for ; Mon, 24 Aug 2020 09:56:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1FEC220FC3 for ; Mon, 24 Aug 2020 09:56:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598262961; bh=D+Vmybzmzen28AV30V9SfoitNCjmhrlbMMUqq2jVhw8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=FSgD1ZptxgLhLI2ItfdBsRdJr5d02vTSdLFHsJAmo9ROqAZCcfshMC52rTBcgwhOb h69jinMu9/7UHgCr1opF1YmEJ6M6GCbC7bNs4LQ9F4FjUxEVl+wqNL3qhUWl46p1Uj TglIe0GpL3CPp1OIom5OvGlzhlmjLca413G8TVHI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729643AbgHXJz6 (ORCPT ); Mon, 24 Aug 2020 05:55:58 -0400 Received: from mail.kernel.org ([198.145.29.99]:48694 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726990AbgHXIgS (ORCPT ); Mon, 24 Aug 2020 04:36:18 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1EA0F2224D; Mon, 24 Aug 2020 08:36:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598258177; bh=D+Vmybzmzen28AV30V9SfoitNCjmhrlbMMUqq2jVhw8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PpNylCI5guRHNajXSQFloxpJtZb1RzeYKoUfzNuPN8t3Sp76Q/47Drf759UIqmJ7g 9tvONp5zBG4xnZkr3IHvgByD5RYWfkj175v8pvY49YMKbWYfgJdFinwx2yoFs/B5V8 2FkaX80dyDTa32o5xRsKIl6hMkUTrh/S9Vfk3SSg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Oleksij Rempel , Marc Kleine-Budde , Sasha Levin Subject: [PATCH 5.8 085/148] can: j1939: transport: j1939_simple_recv(): ignore local J1939 messages send not by J1939 stack Date: Mon, 24 Aug 2020 10:29:43 +0200 Message-Id: <20200824082418.127157572@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200824082413.900489417@linuxfoundation.org> References: <20200824082413.900489417@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Oleksij Rempel [ Upstream commit b43e3a82bc432c1caaed8950e7662c143470c54c ] In current J1939 stack implementation, we process all locally send messages as own messages. Even if it was send by CAN_RAW socket. To reproduce it use following commands: testj1939 -P -r can0:0x80 & cansend can0 18238040#0123 This step will trigger false positive not critical warning: j1939_simple_recv: Received already invalidated message With this patch we add additional check to make sure, related skb is own echo message. Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Signed-off-by: Oleksij Rempel Link: https://lore.kernel.org/r/20200807105200.26441-2-o.rempel@pengutronix.de Signed-off-by: Marc Kleine-Budde Signed-off-by: Sasha Levin --- net/can/j1939/socket.c | 1 + net/can/j1939/transport.c | 4 ++++ 2 files changed, 5 insertions(+) diff --git a/net/can/j1939/socket.c b/net/can/j1939/socket.c index 1b7dc1a8547f3..bf9fd6ee88fe0 100644 --- a/net/can/j1939/socket.c +++ b/net/can/j1939/socket.c @@ -398,6 +398,7 @@ static int j1939_sk_init(struct sock *sk) spin_lock_init(&jsk->sk_session_queue_lock); INIT_LIST_HEAD(&jsk->sk_session_queue); sk->sk_destruct = j1939_sk_sock_destruct; + sk->sk_protocol = CAN_J1939; return 0; } diff --git a/net/can/j1939/transport.c b/net/can/j1939/transport.c index 5bfe6bf15a999..30957c9a8eb7a 100644 --- a/net/can/j1939/transport.c +++ b/net/can/j1939/transport.c @@ -2032,6 +2032,10 @@ void j1939_simple_recv(struct j1939_priv *priv, struct sk_buff *skb) if (!skb->sk) return; + if (skb->sk->sk_family != AF_CAN || + skb->sk->sk_protocol != CAN_J1939) + return; + j1939_session_list_lock(priv); session = j1939_session_get_simple(priv, skb); j1939_session_list_unlock(priv); -- 2.25.1