From: YueHaibing Date: Thu, 16 May 2019 14:36:26 +0000 (+0800) Subject: can: af_can: Fix error path of can_init() X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=c5a3aed1cd3152429348ee1fe5cdcca65fe901ce;p=openwrt%2Fstaging%2Fblogic.git can: af_can: Fix error path of can_init() 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 Acked-by: Oliver Hartkopp Signed-off-by: Marc Kleine-Budde --- diff --git a/net/can/af_can.c b/net/can/af_can.c index e8fd5dc1780a..743470680127 100644 --- a/net/can/af_can.c +++ b/net/can/af_can.c @@ -952,6 +952,8 @@ 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) || @@ -965,15 +967,31 @@ 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)