From: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
To: unlisted-recipients:; (no To-header on input)
Cc: linuxarm@huawei.com, mauro.chehab@huawei.com,
Mauro Carvalho Chehab <mchehab+huawei@kernel.org>,
"Gustavo A. R. Silva" <gustavoars@kernel.org>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
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 [thread overview]
Message-ID: <9b1948f067df308cf875a3d8ec85aaa6b7340a65.1623846327.git.mchehab+huawei@kernel.org> (raw)
In-Reply-To: <cover.1623846327.git.mchehab+huawei@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 <mchehab+huawei@kernel.org>
---
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 <linux/module.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
+#include <linux/nospec.h>
#include <linux/etherdevice.h>
#include <linux/dvb/net.h>
#include <linux/uio.h>
@@ -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;
--
2.31.1
next prev parent reply other threads:[~2021-06-16 12:28 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-16 12:28 [PATCH 00/11] Address some smatch warnings Mauro Carvalho Chehab
2021-06-16 12:28 ` [PATCH 01/11] media: dvb_ca_en50221: avoid speculation from CA slot Mauro Carvalho Chehab
2021-06-16 12:28 ` Mauro Carvalho Chehab [this message]
2021-06-16 12:28 ` [PATCH 03/11] media: dvbdev: fix error logic at dvb_register_device() Mauro Carvalho Chehab
2021-06-16 12:28 ` [PATCH 04/11] media: sun6i-csi: add a missing return code Mauro Carvalho Chehab
2021-06-17 5:37 ` yong
2021-06-16 12:28 ` [PATCH 05/11] media: saa7134: use more meaninful goto labels Mauro Carvalho Chehab
2021-06-16 12:28 ` [PATCH 06/11] media: saa7134: fix saa7134_initdev error handling logic Mauro Carvalho Chehab
2021-06-16 12:28 ` [PATCH 07/11] media: siano: fix device register error path Mauro Carvalho Chehab
2021-06-16 12:28 ` [PATCH 08/11] media: adv7842: better document EDID block size Mauro Carvalho Chehab
2021-06-16 12:32 ` Hans Verkuil
2021-06-17 6:26 ` kernel test robot
2021-06-17 8:15 ` kernel test robot
2021-06-16 12:28 ` [PATCH 09/11] media: ttusb-dec: cleanup an error handling logic Mauro Carvalho Chehab
2021-06-16 12:28 ` [PATCH 10/11] media: dvb-core: frontend: make GET/SET safer Mauro Carvalho Chehab
2021-06-16 12:28 ` [PATCH 11/11] media: xilinx: simplify get fourcc logic Mauro Carvalho Chehab
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