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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,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 3CEE9C4332D for ; Wed, 18 Mar 2020 20:55:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0A3572137B for ; Wed, 18 Mar 2020 20:55:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1584564919; bh=wR2TR1w/ynq1jlGvet5axAAOUI1ZOzfFYH8EMarjZvo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=NYs5UEUNe7AUzz2aPe1Jp7kGvSmcY9h+bQfB2Yg7Tki6fKT48hf0lpChffGRT8JAQ i57y+g214JQ1wKZk9lLSsy7N/jUrwfWplYQd+OcfNuakxLBRPo19cxfcuCdas5EtpS AYnphJS5lGrOJXyHT4G3SiqxUveQD5ymBaYCLULY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728264AbgCRUzR (ORCPT ); Wed, 18 Mar 2020 16:55:17 -0400 Received: from mail.kernel.org ([198.145.29.99]:55536 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728214AbgCRUzO (ORCPT ); Wed, 18 Mar 2020 16:55:14 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 248F7215A4; Wed, 18 Mar 2020 20:55:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1584564914; bh=wR2TR1w/ynq1jlGvet5axAAOUI1ZOzfFYH8EMarjZvo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aA5JdqvH5YGGmS7IBy1NY22KEjMI29LHFBHMXXdbnTwqhQSbk/HpmdCe4E2QMVwLI diOu5m7u5mrNHXXkM6f92i/7213IeAdKPGLEz4oFN14GwLt/hTMorzmW6vXSCPnWTS 9lyc7xxDJmkY0Q0xEQ8Rh/jva2RWjZRso88/AaEI= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Sven Eckelmann , syzbot+a98f2016f40b9cd3818a@syzkaller.appspotmail.com, syzbot+ac36b6a33c28a491e929@syzkaller.appspotmail.com, Hillf Danton , Simon Wunderlich , Sasha Levin , b.a.t.m.a.n@lists.open-mesh.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 03/37] batman-adv: Don't schedule OGM for disabled interface Date: Wed, 18 Mar 2020 16:54:35 -0400 Message-Id: <20200318205509.17053-3-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200318205509.17053-1-sashal@kernel.org> References: <20200318205509.17053-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Sven Eckelmann [ Upstream commit 8e8ce08198de193e3d21d42e96945216e3d9ac7f ] A transmission scheduling for an interface which is currently dropped by batadv_iv_ogm_iface_disable could still be in progress. The B.A.T.M.A.N. V is simply cancelling the workqueue item in an synchronous way but this is not possible with B.A.T.M.A.N. IV because the OGM submissions are intertwined. Instead it has to stop submitting the OGM when it detect that the buffer pointer is set to NULL. Reported-by: syzbot+a98f2016f40b9cd3818a@syzkaller.appspotmail.com Reported-by: syzbot+ac36b6a33c28a491e929@syzkaller.appspotmail.com Fixes: c6c8fea29769 ("net: Add batman-adv meshing protocol") Signed-off-by: Sven Eckelmann Cc: Hillf Danton Signed-off-by: Simon Wunderlich Signed-off-by: Sasha Levin --- net/batman-adv/bat_iv_ogm.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c index f5941837c3ad4..0b052ff51bdeb 100644 --- a/net/batman-adv/bat_iv_ogm.c +++ b/net/batman-adv/bat_iv_ogm.c @@ -970,6 +970,10 @@ static void batadv_iv_ogm_schedule_buff(struct batadv_hard_iface *hard_iface) lockdep_assert_held(&hard_iface->bat_iv.ogm_buff_mutex); + /* interface already disabled by batadv_iv_ogm_iface_disable */ + if (!*ogm_buff) + return; + /* the interface gets activated here to avoid race conditions between * the moment of activating the interface in * hardif_activate_interface() where the originator mac is set and -- 2.20.1