[net 1/2] can: isotp: isotp_getname(): fix kernel information leak

[Marc Kleine-Budde]

From: Oliver Hartkopp <socket...@hartkopp.net>

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
Fixes: e057dd3fc20f ("can: add ISO 15765-2:2016 transport protocol")
Signed-off-by: Oliver Hartkopp <socket...@hartkopp.net>
Link: https://lore.kernel.org/r/20210112091643.11789-1-socket...@hartkopp.net
Signed-off-by: Marc Kleine-Budde <m...@pengutronix.de>
---
 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
@@ -1155,6 +1155,7 @@ static int isotp_getname(struct socket *sock, struct 
sockaddr *uaddr, int peer)
        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;

base-commit: a95d25dd7b94a5ba18246da09b4218f132fed60e
-- 
2.29.2