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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 3E15BC4332D for ; Thu, 19 Mar 2020 13:33:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1665920789 for ; Thu, 19 Mar 2020 13:33:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1584624804; bh=h++JHvlq0URUaxWR2YFil30omclmOjygV8exSEpksy0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=2t6eZ+LdVoDgVqaI94hKMOOHoTrxW60RTlUShH5jmcJhIwAiSqzAIhbCkY21ZTokW 6Fi1vnTslsfP77UZlkPUxMboqcMQvnwl+wgBj2qcaAH9Gso0KsrUH0wUf2sEpQ3uqX RcrCavi7UitHl3Nz/06syAbEtN5nRo0g6PXxVl1U= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728611AbgCSNNr (ORCPT ); Thu, 19 Mar 2020 09:13:47 -0400 Received: from mail.kernel.org ([198.145.29.99]:32856 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727549AbgCSNNo (ORCPT ); Thu, 19 Mar 2020 09:13:44 -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 B460120722; Thu, 19 Mar 2020 13:13:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1584623623; bh=h++JHvlq0URUaxWR2YFil30omclmOjygV8exSEpksy0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jnOTQXdwSSC+cxp/EYKcDGM009C4h7jcsq3rjr8N8RgpjF8Y6YT2U36QT70Nb/ABc ACd8Gs5cLMsb0QxRBATA76VnaQdN/u489V5VNmXE3E6busUroEPoxIhwyNozv00AuF wcc1kJe7D1C9BYL4d84ANopcGGoGZoeXmgT37xC4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Guillaume Nault , Matteo Croce , Paul Moore , "David S. Miller" Subject: [PATCH 4.9 90/90] ipv4: ensure rcu_read_lock() in cipso_v4_error() Date: Thu, 19 Mar 2020 14:00:52 +0100 Message-Id: <20200319123955.953025598@linuxfoundation.org> X-Mailer: git-send-email 2.25.2 In-Reply-To: <20200319123928.635114118@linuxfoundation.org> References: <20200319123928.635114118@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Matteo Croce commit 3e72dfdf8227b052393f71d820ec7599909dddc2 upstream. Similarly to commit c543cb4a5f07 ("ipv4: ensure rcu_read_lock() in ipv4_link_failure()"), __ip_options_compile() must be called under rcu protection. Fixes: 3da1ed7ac398 ("net: avoid use IPCB in cipso_v4_error") Suggested-by: Guillaume Nault Signed-off-by: Matteo Croce Acked-by: Paul Moore Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/ipv4/cipso_ipv4.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) --- a/net/ipv4/cipso_ipv4.c +++ b/net/ipv4/cipso_ipv4.c @@ -1738,6 +1738,7 @@ void cipso_v4_error(struct sk_buff *skb, { unsigned char optbuf[sizeof(struct ip_options) + 40]; struct ip_options *opt = (struct ip_options *)optbuf; + int res; if (ip_hdr(skb)->protocol == IPPROTO_ICMP || error != -EACCES) return; @@ -1749,7 +1750,11 @@ void cipso_v4_error(struct sk_buff *skb, memset(opt, 0, sizeof(struct ip_options)); opt->optlen = ip_hdr(skb)->ihl*4 - sizeof(struct iphdr); - if (__ip_options_compile(dev_net(skb->dev), opt, skb, NULL)) + rcu_read_lock(); + res = __ip_options_compile(dev_net(skb->dev), opt, skb, NULL); + rcu_read_unlock(); + + if (res) return; if (gateway)