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 CF264C43441 for ; Thu, 29 Nov 2018 14:27:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 96D15213A2 for ; Thu, 29 Nov 2018 14:27:59 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="Anep66RZ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 96D15213A2 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 S2387888AbeK3Bda (ORCPT ); Thu, 29 Nov 2018 20:33:30 -0500 Received: from mail.kernel.org ([198.145.29.99]:34118 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731863AbeK3Bd2 (ORCPT ); Thu, 29 Nov 2018 20:33:28 -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 BEEEA2133F; Thu, 29 Nov 2018 14:27:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1543501676; bh=9hS67AwPFo1hlyBFM7o2Vzf1fLz7+BzL7kOvJfITrOY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Anep66RZHZhlVw8vMOM578wpRvVtK/ZJU6ZGqIBsgX3NsZN3xCIaDIfBNKYrnIe1+ o8PBi1EA07HMjioS2e7PThtBSWFVjlnfBrBA/lS4Q/nSwQM17nUsSUAjZgt9vByFhM KTJbLnXPjCjKuoxrtmRmiHsmoSMU/9HT3JCjRlZs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Alexander Aring , Stefan Schmidt Subject: [PATCH 4.14 096/100] net: ieee802154: 6lowpan: fix frag reassembly Date: Thu, 29 Nov 2018 15:13:06 +0100 Message-Id: <20181129140107.059805029@linuxfoundation.org> X-Mailer: git-send-email 2.19.2 In-Reply-To: <20181129140058.768942700@linuxfoundation.org> References: <20181129140058.768942700@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 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Alexander Aring commit f18fa5de5ba7f1d6650951502bb96a6e4715a948 upstream. This patch initialize stack variables which are used in frag_lowpan_compare_key to zero. In my case there are padding bytes in the structures ieee802154_addr as well in frag_lowpan_compare_key. Otherwise the key variable contains random bytes. The result is that a compare of two keys by memcmp works incorrect. Fixes: 648700f76b03 ("inet: frags: use rhashtables for reassembly units") Signed-off-by: Alexander Aring Reported-by: Stefan Schmidt Signed-off-by: Stefan Schmidt Signed-off-by: Greg Kroah-Hartman --- net/ieee802154/6lowpan/6lowpan_i.h | 4 ++-- net/ieee802154/6lowpan/reassembly.c | 14 +++++++------- 2 files changed, 9 insertions(+), 9 deletions(-) --- a/net/ieee802154/6lowpan/6lowpan_i.h +++ b/net/ieee802154/6lowpan/6lowpan_i.h @@ -20,8 +20,8 @@ typedef unsigned __bitwise lowpan_rx_res struct frag_lowpan_compare_key { u16 tag; u16 d_size; - const struct ieee802154_addr src; - const struct ieee802154_addr dst; + struct ieee802154_addr src; + struct ieee802154_addr dst; }; /* Equivalent of ipv4 struct ipq --- a/net/ieee802154/6lowpan/reassembly.c +++ b/net/ieee802154/6lowpan/reassembly.c @@ -75,14 +75,14 @@ fq_find(struct net *net, const struct lo { struct netns_ieee802154_lowpan *ieee802154_lowpan = net_ieee802154_lowpan(net); - struct frag_lowpan_compare_key key = { - .tag = cb->d_tag, - .d_size = cb->d_size, - .src = *src, - .dst = *dst, - }; + struct frag_lowpan_compare_key key = {}; struct inet_frag_queue *q; + key.tag = cb->d_tag; + key.d_size = cb->d_size; + key.src = *src; + key.dst = *dst; + q = inet_frag_find(&ieee802154_lowpan->frags, &key); if (!q) return NULL; @@ -372,7 +372,7 @@ int lowpan_frag_rcv(struct sk_buff *skb, struct lowpan_frag_queue *fq; struct net *net = dev_net(skb->dev); struct lowpan_802154_cb *cb = lowpan_802154_cb(skb); - struct ieee802154_hdr hdr; + struct ieee802154_hdr hdr = {}; int err; if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0)