[PATCH 5.10 098/103] can: isotp: isotp_getname(): fix kernel information leak

[Greg Kroah-Hartman]

From: Oliver Hartkopp <socketcan@xxxxxxxxxxxx>

commit b42b3a2744b3e8f427de79896720c72823af91ad upstream.

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

Suggested-by: Cong Wang <xiyou.wangcong@xxxxxxxxx>
Reported-by: syzbot+057884e2f453e8afebc8@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: e057dd3fc20f ("can: add ISO 15765-2:2016 transport protocol")
Signed-off-by: Oliver Hartkopp <socketcan@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210112091643.11789-1-socketcan@xxxxxxxxxxxx
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 net/can/isotp.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/can/isotp.c
+++ b/net/can/isotp.c
@@ -1139,6 +1139,7 @@ static int isotp_getname(struct socket *
 	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;