stable.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Marc Kleine-Budde <mkl@pengutronix.de>
To: netdev@vger.kernel.org
Cc: davem@davemloft.net, kuba@kernel.org, linux-can@vger.kernel.org,
	kernel@pengutronix.de, Oliver Hartkopp <socketcan@hartkopp.net>,
	syzbot+2d7f58292cb5b29eb5ad@syzkaller.appspotmail.com,
	Wei Chen <harperchen1110@gmail.com>,
	stable@vger.kernel.org, Marc Kleine-Budde <mkl@pengutronix.de>
Subject: [PATCH net 1/4] can: af_can: fix NULL pointer dereference in can_rcv_filter
Date: Wed,  7 Dec 2022 11:52:40 +0100	[thread overview]
Message-ID: <20221207105243.2483884-2-mkl@pengutronix.de> (raw)
In-Reply-To: <20221207105243.2483884-1-mkl@pengutronix.de>

From: Oliver Hartkopp <socketcan@hartkopp.net>

Analogue to commit 8aa59e355949 ("can: af_can: fix NULL pointer
dereference in can_rx_register()") we need to check for a missing
initialization of ml_priv in the receive path of CAN frames.

Since commit 4e096a18867a ("net: introduce CAN specific pointer in the
struct net_device") the check for dev->type to be ARPHRD_CAN is not
sufficient anymore since bonding or tun netdevices claim to be CAN
devices but do not initialize ml_priv accordingly.

Fixes: 4e096a18867a ("net: introduce CAN specific pointer in the struct net_device")
Reported-by: syzbot+2d7f58292cb5b29eb5ad@syzkaller.appspotmail.com
Reported-by: Wei Chen <harperchen1110@gmail.com>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Link: https://lore.kernel.org/all/20221206201259.3028-1-socketcan@hartkopp.net
Cc: stable@vger.kernel.org
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 net/can/af_can.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/can/af_can.c b/net/can/af_can.c
index 27dcdcc0b808..c69168f11e44 100644
--- a/net/can/af_can.c
+++ b/net/can/af_can.c
@@ -677,7 +677,7 @@ static void can_receive(struct sk_buff *skb, struct net_device *dev)
 static int can_rcv(struct sk_buff *skb, struct net_device *dev,
 		   struct packet_type *pt, struct net_device *orig_dev)
 {
-	if (unlikely(dev->type != ARPHRD_CAN || (!can_is_can_skb(skb)))) {
+	if (unlikely(dev->type != ARPHRD_CAN || !can_get_ml_priv(dev) || !can_is_can_skb(skb))) {
 		pr_warn_once("PF_CAN: dropped non conform CAN skbuff: dev type %d, len %d\n",
 			     dev->type, skb->len);
 
@@ -692,7 +692,7 @@ static int can_rcv(struct sk_buff *skb, struct net_device *dev,
 static int canfd_rcv(struct sk_buff *skb, struct net_device *dev,
 		     struct packet_type *pt, struct net_device *orig_dev)
 {
-	if (unlikely(dev->type != ARPHRD_CAN || (!can_is_canfd_skb(skb)))) {
+	if (unlikely(dev->type != ARPHRD_CAN || !can_get_ml_priv(dev) || !can_is_canfd_skb(skb))) {
 		pr_warn_once("PF_CAN: dropped non conform CAN FD skbuff: dev type %d, len %d\n",
 			     dev->type, skb->len);
 
@@ -707,7 +707,7 @@ static int canfd_rcv(struct sk_buff *skb, struct net_device *dev,
 static int canxl_rcv(struct sk_buff *skb, struct net_device *dev,
 		     struct packet_type *pt, struct net_device *orig_dev)
 {
-	if (unlikely(dev->type != ARPHRD_CAN || (!can_is_canxl_skb(skb)))) {
+	if (unlikely(dev->type != ARPHRD_CAN || !can_get_ml_priv(dev) || !can_is_canxl_skb(skb))) {
 		pr_warn_once("PF_CAN: dropped non conform CAN XL skbuff: dev type %d, len %d\n",
 			     dev->type, skb->len);
 

base-commit: 1799c1b85e292fbfad99892bbea0beee925149e8
-- 
2.35.1



       reply	other threads:[~2022-12-07 10:53 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20221207105243.2483884-1-mkl@pengutronix.de>
2022-12-07 10:52 ` Marc Kleine-Budde [this message]
2022-12-08  3:10   ` [PATCH net 1/4] can: af_can: fix NULL pointer dereference in can_rcv_filter patchwork-bot+netdevbpf
2022-12-07 10:52 ` [PATCH net 2/4] can: slcan: fix freed work crash Marc Kleine-Budde
2022-12-07 10:52 ` [PATCH net 3/4] can: can327: flush TX_work on ldisc .close() Marc Kleine-Budde
2022-12-07 10:52 ` [PATCH net 4/4] can: esd_usb: Allow REC and TEC to return to zero Marc Kleine-Budde

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20221207105243.2483884-2-mkl@pengutronix.de \
    --to=mkl@pengutronix.de \
    --cc=davem@davemloft.net \
    --cc=harperchen1110@gmail.com \
    --cc=kernel@pengutronix.de \
    --cc=kuba@kernel.org \
    --cc=linux-can@vger.kernel.org \
    --cc=netdev@vger.kernel.org \
    --cc=socketcan@hartkopp.net \
    --cc=stable@vger.kernel.org \
    --cc=syzbot+2d7f58292cb5b29eb5ad@syzkaller.appspotmail.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).