From: Oliver Hartkopp socketcan@hartkopp.net
stable inclusion from stable-v5.10.155 commit f8e0edeaa0f2b860bdbbf0aafb4492533043d650 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAGEOP CVE: CVE-2024-42076
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit 3eb3d283e8579a22b81dd2ac3987b77465b2a22f upstream.
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@pengutronix.de Link: https://lore.kernel.org/linux-can/20221104052235.GA6474@pengutronix.de Reported-by: syzbot+d168ec0caca4697e03b1@syzkaller.appspotmail.com Signed-off-by: Oliver Hartkopp socketcan@hartkopp.net Link: https://lore.kernel.org/all/20221104075000.105414-1-socketcan@hartkopp.net Cc: stable@vger.kernel.org Signed-off-by: Marc Kleine-Budde mkl@pengutronix.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Zhengchao Shao shaozhengchao@huawei.com --- 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 ca75d1b8f415..9da8fbc81c04 100644 --- a/net/can/j1939/main.c +++ b/net/can/j1939/main.c @@ -332,6 +332,9 @@ 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));