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=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 ECA7EC4332D for ; Wed, 18 Mar 2020 20:53:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B73D120724 for ; Wed, 18 Mar 2020 20:53:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1584564815; bh=F0FLa2iKgD3VIOUQXUfJd6u9S0Ph0eysk4JIX+3072E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=lS530zL/QkBsHDbQuXkk3HIwIRx+uicfqb7aE7oJ8bZNu5QjUZbvOQGXJ4WCDeQLh scpZh1UMERop9qa5uvSfeK6GEvlhe0HvhbcKkpg6P+b84e4bkGm5oytH42Ixf43NBC FYfq4SRCgdGKAIi2GSWpr4NSEn1s2Uh3XNYkHOfQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727162AbgCRUxe (ORCPT ); Wed, 18 Mar 2020 16:53:34 -0400 Received: from mail.kernel.org ([198.145.29.99]:52380 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727022AbgCRUx3 (ORCPT ); Wed, 18 Mar 2020 16:53:29 -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 85C8520777; Wed, 18 Mar 2020 20:53:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1584564808; bh=F0FLa2iKgD3VIOUQXUfJd6u9S0Ph0eysk4JIX+3072E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0uP77P7+2vNnJS3CN7ojZJenxyX8npZI4WgZSfnIhxDBAi+U26hoR13tBqYmwMlZb mr0eXWBRAlKtVqm5ew8WHplYfk9yyCOHWY2McbmzoUMbgavtEb7k6qmWNd1i8Pi6WA d8jeXYatF5Dm+FOJLTSx5Eni8jzQG7HeCGS5UcZk= 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 5.5 05/84] batman-adv: Don't schedule OGM for disabled interface Date: Wed, 18 Mar 2020 16:52:02 -0400 Message-Id: <20200318205321.16066-5-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200318205321.16066-1-sashal@kernel.org> References: <20200318205321.16066-1-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 5b0b20e6da956..d88a4de022372 100644 --- a/net/batman-adv/bat_iv_ogm.c +++ b/net/batman-adv/bat_iv_ogm.c @@ -789,6 +789,10 @@ 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