[PATCH] can: isotp: fix isotp_getname() leak

[Oliver Hartkopp]

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

Suggested-by: Cong Wang <xiyou.wangc...@gmail.com>
Reported-by: syzbot+057884e2f453e8afe...@syzkaller.appspotmail.com
Signed-off-by: Oliver Hartkopp <socket...@hartkopp.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