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

Greg Kroah-Hartman
2021-01-15T12:42:22Z

From: Oliver Hartkopp <socketcan@hartkopp.net>

commit b42b3a2744b3e8f427de79896720c72823af91ad upstream.

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

Suggested-by: Cong Wang <xiyou.wangcong@gmail.com>
Reported-by: syzbot+057884e2f453e8afebc8@syzkaller.appspotmail.com
Fixes: e057dd3fc20f ("can: add ISO 15765-2:2016 transport protocol")
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Link: https://lore.kernel.org/r/20210112091643.11789-1-socketcan@hartkopp.net
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
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;