netdev - [PATCH] can: isotp: fix isotp

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Date:   Tue, 12 Jan 2021 10:04:57 +0100
From:   Oliver Hartkopp <socketcan@...tkopp.net>
To:     mkl@...gutronix.de, kuba@...nel.org, netdev@...r.kernel.org,
        linux-can@...r.kernel.org
Cc:     Oliver Hartkopp <socketcan@...tkopp.net>,
        Cong Wang <xiyou.wangcong@...il.com>,
        syzbot+057884e2f453e8afebc8@...kaller.appspotmail.com
Subject: [PATCH] can: isotp: fix isotp_getname() leak

Initialize the sockaddr_can structure to prevent a data leak to user space.

Suggested-by: Cong Wang <xiyou.wangcong@...il.com>
Reported-by: syzbot+057884e2f453e8afebc8@...kaller.appspotmail.com
Signed-off-by: Oliver Hartkopp <socketcan@...tkopp.net>
---
 net/can/isotp.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/can/isotp.c b/net/can/isotp.c
index 7839c3b9e5be..3ef7f78e553b 100644
--- a/net/can/isotp.c
+++ b/net/can/isotp.c
@@ -1153,10 +1153,11 @@ static int isotp_getname(struct socket *sock, struct sockaddr *uaddr, int peer)
 	struct isotp_sock *so = isotp_sk(sk);
 
 	if (peer)
 		return -EOPNOTSUPP;
 
+	memset(addr, 0, sizeof(*addr));
 	addr->can_family = AF_CAN;
 	addr->can_ifindex = so->ifindex;
 	addr->can_addr.tp.rx_id = so->rxid;
 	addr->can_addr.tp.tx_id = so->txid;
 
-- 
2.29.2