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=-7.5 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 59934C43441 for ; Thu, 29 Nov 2018 14:18:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2178D205C9 for ; Thu, 29 Nov 2018 14:18:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="sch5VUGM" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2178D205C9 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730658AbeK3BXi (ORCPT ); Thu, 29 Nov 2018 20:23:38 -0500 Received: from mail.kernel.org ([198.145.29.99]:45916 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729763AbeK3BXh (ORCPT ); Thu, 29 Nov 2018 20:23:37 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.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 9BF3E21104; Thu, 29 Nov 2018 14:18:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1543501087; bh=pb9IbpFQsiGXFgGXOq8vgHRg0+zKZGe9pe/OYK353FU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=sch5VUGMAebwMz720yYZ9Zb5QXzRbJ/RG4VXXgGUDKR7CBZanHTzqyggLP/70NLL0 6EoM72soXzTMiWdqmRJy7kOYG9uDYY6aMNdSP8s2z98OQzZG9icDt5tbr/BAx1pqaA Dd+EPP8WB40wgnumE543uoDSUkTTdTYSWWuWDzDc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+56a40ceee5fb35932f4d@syzkaller.appspotmail.com, Xin Long , "David S. Miller" Subject: [PATCH 4.4 07/86] sctp: clear the transport of some out_chunk_list chunks in sctp_assoc_rm_peer Date: Thu, 29 Nov 2018 15:11:32 +0100 Message-Id: <20181129140110.521138743@linuxfoundation.org> X-Mailer: git-send-email 2.19.2 In-Reply-To: <20181129140109.832117862@linuxfoundation.org> References: <20181129140109.832117862@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review 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 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Xin Long commit df132eff463873e14e019a07f387b4d577d6d1f9 upstream. If a transport is removed by asconf but there still are some chunks with this transport queuing on out_chunk_list, later an use-after-free issue will be caused when accessing this transport from these chunks in sctp_outq_flush(). This is an old bug, we fix it by clearing the transport of these chunks in out_chunk_list when removing a transport in sctp_assoc_rm_peer(). Reported-by: syzbot+56a40ceee5fb35932f4d@syzkaller.appspotmail.com Signed-off-by: Xin Long Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/sctp/associola.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) --- a/net/sctp/associola.c +++ b/net/sctp/associola.c @@ -486,8 +486,9 @@ void sctp_assoc_set_primary(struct sctp_ void sctp_assoc_rm_peer(struct sctp_association *asoc, struct sctp_transport *peer) { - struct list_head *pos; - struct sctp_transport *transport; + struct sctp_transport *transport; + struct list_head *pos; + struct sctp_chunk *ch; pr_debug("%s: association:%p addr:%pISpc\n", __func__, asoc, &peer->ipaddr.sa); @@ -543,7 +544,6 @@ void sctp_assoc_rm_peer(struct sctp_asso */ if (!list_empty(&peer->transmitted)) { struct sctp_transport *active = asoc->peer.active_path; - struct sctp_chunk *ch; /* Reset the transport of each chunk on this list */ list_for_each_entry(ch, &peer->transmitted, @@ -565,6 +565,10 @@ void sctp_assoc_rm_peer(struct sctp_asso sctp_transport_hold(active); } + list_for_each_entry(ch, &asoc->outqueue.out_chunk_list, list) + if (ch->transport == peer) + ch->transport = NULL; + asoc->peer.transport_count--; sctp_transport_free(peer);