[PATCH net 3/5] can: j1939: j1939_send_one(): fix missing CAN header initialization

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



From: Oliver Hartkopp <socketcan@xxxxxxxxxxxx>

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@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/linux-can/20221104052235.GA6474@xxxxxxxxxxxxxx
Reported-by: syzbot+d168ec0caca4697e03b1@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Oliver Hartkopp <socketcan@xxxxxxxxxxxx>
Link: https://lore.kernel.org/all/20221104075000.105414-1-socketcan@xxxxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
---
 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





[Index of Archives]     [Automotive Discussions]     [Linux ARM Kernel]     [Linux ARM]     [Linux Omap]     [Fedora ARM]     [IETF Annouce]     [Security]     [Bugtraq]     [Linux]     [Linux OMAP]     [Linux MIPS]     [eCos]     [Asterisk Internet PBX]     [Linux API]     [CAN Bus]

  Powered by Linux