netdev - [PATCH net 4/6] can: j1939: j1939_send_one(): fix missing CAN header initialization

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Message-Id: <20221107133217.59861-5-mkl@pengutronix.de>
Date:   Mon,  7 Nov 2022 14:32:15 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, linux-can@...r.kernel.org,
        kernel@...gutronix.de, Oliver Hartkopp <socketcan@...tkopp.net>,
        Oleksij Rempel <o.rempel@...gutronix.de>,
        syzbot+d168ec0caca4697e03b1@...kaller.appspotmail.com,
        stable@...r.kernel.org, Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH net 4/6] can: j1939: j1939_send_one(): fix missing CAN header initialization

From: Oliver Hartkopp <socketcan@...tkopp.net>

The read access to struct canxl_frame::len inside of a j1939 created
skbuff revealed a missing initialization of reserved and later filled
elements in struct can_frame.

This patch initializes the 8 byte CAN header with zero.

Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol")
Cc: Oleksij Rempel <o.rempel@...gutronix.de>
Link: https://lore.kernel.org/linux-can/20221104052235.GA6474@pengutronix.de
Reported-by: syzbot+d168ec0caca4697e03b1@...kaller.appspotmail.com
Signed-off-by: Oliver Hartkopp <socketcan@...tkopp.net>
Link: https://lore.kernel.org/all/20221104075000.105414-1-socketcan@hartkopp.net
Cc: stable@...r.kernel.org
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 net/can/j1939/main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/can/j1939/main.c b/net/can/j1939/main.c
index 144c86b0e3ff..821d4ff303b3 100644
--- a/net/can/j1939/main.c
+++ b/net/can/j1939/main.c
@@ -336,6 +336,9 @@ int j1939_send_one(struct j1939_priv *priv, struct sk_buff *skb)
 	/* re-claim the CAN_HDR from the SKB */
 	cf = skb_push(skb, J1939_CAN_HDR);
 
+	/* initialize header structure */
+	memset(cf, 0, J1939_CAN_HDR);
+
 	/* make it a full can frame again */
 	skb_put(skb, J1939_CAN_FTR + (8 - dlc));
 
-- 
2.35.1