From patchwork Wed Jun 16 12:28:28 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 461732 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=-16.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, 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 6E075C48BE6 for ; Wed, 16 Jun 2021 12:28:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4C9C1613DC for ; Wed, 16 Jun 2021 12:28:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232421AbhFPMas (ORCPT ); Wed, 16 Jun 2021 08:30:48 -0400 Received: from mail.kernel.org ([198.145.29.99]:49222 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230283AbhFPMaq (ORCPT ); Wed, 16 Jun 2021 08:30:46 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 7DF5B61359; Wed, 16 Jun 2021 12:28:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1623846520; bh=nqOi7exA2OYkFrttpEgptdFAZL2FSfg8ZJVmqK1EC10=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=W7s5YjzDLCJAnl3xLIFrS2/DOCq9zs+J42zFZHceYDblpR5xDiSrEqu9zbB2BVWR7 XQ0B7H4EeuCRskAE5HcoVTRQFYn8sqgDWxSrLoE3h/McIqbcdIriEyUTGKknjduqNK /2GbnclE7DQBgwNZkVLCxPpD6v7VKHYR4RMDMZlz7gKQbs5Bop9S6xzO11AmalWPdb CyTZahGB7NDX/eSwgQtTjBn7VxqiNag+fvbyNC9+sMR4X7W9MclHRbp4tmcaO+UhDf NwzqbPZka9o5RRKTGe/zi7AHCBp0a0vDP83AUMLz813W8567JY8bw4cV8ecUiU2Ae6 fZkuWde92fWeQ== Received: by mail.kernel.org with local (Exim 4.94.2) (envelope-from ) id 1ltUes-004oiS-8D; Wed, 16 Jun 2021 14:28:38 +0200 From: Mauro Carvalho Chehab Cc: linuxarm@huawei.com, mauro.chehab@huawei.com, Mauro Carvalho Chehab , "Gustavo A. R. Silva" , Mauro Carvalho Chehab , linux-kernel@vger.kernel.org, linux-media@vger.kernel.org Subject: [PATCH 02/11] media: dvb_net: avoid speculation from net slot Date: Wed, 16 Jun 2021 14:28:28 +0200 Message-Id: <9b1948f067df308cf875a3d8ec85aaa6b7340a65.1623846327.git.mchehab+huawei@kernel.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: References: MIME-Version: 1.0 Sender: Mauro Carvalho Chehab To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org The risk of especulation is actually almost-non-existing here, as there are very few users of TCP/IP using the DVB stack, as, this is mainly used with DVB-S/S2 cards, and only by people that receives TCP/IP from satellite connections, which limits a lot the number of users of such feature(*). (*) In thesis, DVB-C cards could also benefit from it, but I'm yet to see a hardware that supports it. Yet, fixing it is trivial. Signed-off-by: Mauro Carvalho Chehab --- drivers/media/dvb-core/dvb_net.c | 25 +++++++++++++++++++------ 1 file changed, 19 insertions(+), 6 deletions(-) diff --git a/drivers/media/dvb-core/dvb_net.c b/drivers/media/dvb-core/dvb_net.c index 89620da983ba..dddebea644bb 100644 --- a/drivers/media/dvb-core/dvb_net.c +++ b/drivers/media/dvb-core/dvb_net.c @@ -45,6 +45,7 @@ #include #include #include +#include #include #include #include @@ -1462,14 +1463,20 @@ static int dvb_net_do_ioctl(struct file *file, struct net_device *netdev; struct dvb_net_priv *priv_data; struct dvb_net_if *dvbnetif = parg; + int if_num = dvbnetif->if_num; - if (dvbnetif->if_num >= DVB_NET_DEVICES_MAX || - !dvbnet->state[dvbnetif->if_num]) { + if (if_num >= DVB_NET_DEVICES_MAX) { ret = -EINVAL; goto ioctl_error; } + if_num = array_index_nospec(if_num, DVB_NET_DEVICES_MAX); - netdev = dvbnet->device[dvbnetif->if_num]; + if (!dvbnet->state[if_num]) { + ret = -EINVAL; + goto ioctl_error; + } + + netdev = dvbnet->device[if_num]; priv_data = netdev_priv(netdev); dvbnetif->pid=priv_data->pid; @@ -1522,14 +1529,20 @@ static int dvb_net_do_ioctl(struct file *file, struct net_device *netdev; struct dvb_net_priv *priv_data; struct __dvb_net_if_old *dvbnetif = parg; + int if_num = dvbnetif->if_num; - if (dvbnetif->if_num >= DVB_NET_DEVICES_MAX || - !dvbnet->state[dvbnetif->if_num]) { + if (if_num >= DVB_NET_DEVICES_MAX) { ret = -EINVAL; goto ioctl_error; } + if_num = array_index_nospec(if_num, DVB_NET_DEVICES_MAX); - netdev = dvbnet->device[dvbnetif->if_num]; + if (!dvbnet->state[if_num]) { + ret = -EINVAL; + goto ioctl_error; + } + + netdev = dvbnet->device[if_num]; priv_data = netdev_priv(netdev); dvbnetif->pid=priv_data->pid;