[ Upstream commit c5a3aed1cd3152429348ee1fe5cdcca65fe901ce ]
This patch add error path for can_init() to avoid possible crash if some error occurs.
Fixes: 0d66548a10cb ("[CAN]: Add PF_CAN core module") Signed-off-by: YueHaibing yuehaibing@huawei.com Acked-by: Oliver Hartkopp socketcan@hartkopp.net Signed-off-by: Marc Kleine-Budde mkl@pengutronix.de Signed-off-by: Sasha Levin sashal@kernel.org --- net/can/af_can.c | 24 +++++++++++++++++++++--- 1 file changed, 21 insertions(+), 3 deletions(-)
diff --git a/net/can/af_can.c b/net/can/af_can.c index e386d654116d..04132b0b5d36 100644 --- a/net/can/af_can.c +++ b/net/can/af_can.c @@ -959,6 +959,8 @@ static struct pernet_operations can_pernet_ops __read_mostly = {
static __init int can_init(void) { + int err; + /* check for correct padding to be able to use the structs similarly */ BUILD_BUG_ON(offsetof(struct can_frame, can_dlc) != offsetof(struct canfd_frame, len) || @@ -972,15 +974,31 @@ static __init int can_init(void) if (!rcv_cache) return -ENOMEM;
- register_pernet_subsys(&can_pernet_ops); + err = register_pernet_subsys(&can_pernet_ops); + if (err) + goto out_pernet;
/* protocol register */ - sock_register(&can_family_ops); - register_netdevice_notifier(&can_netdev_notifier); + err = sock_register(&can_family_ops); + if (err) + goto out_sock; + err = register_netdevice_notifier(&can_netdev_notifier); + if (err) + goto out_notifier; + dev_add_pack(&can_packet); dev_add_pack(&canfd_packet);
return 0; + +out_notifier: + sock_unregister(PF_CAN); +out_sock: + unregister_pernet_subsys(&can_pernet_ops); +out_pernet: + kmem_cache_destroy(rcv_cache); + + return err; }
static __exit void can_exit(void)