6.1-stable review patch. If anyone has any objections, please let me know.
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From: Kuniyuki Iwashima kuniyu@amazon.com
[ Upstream commit d51705614f668254cc5def7490df76f9680b4659 ]
Since introduced, mctp has been ignoring the returned value of rtnl_register_module(), which could fail silently.
Handling the error allows users to view a module as an all-or-nothing thing in terms of the rtnetlink functionality. This prevents syzkaller from reporting spurious errors from its tests, where OOM often occurs and module is automatically loaded.
Let's handle the errors by rtnl_register_many().
Fixes: 583be982d934 ("mctp: Add device handling and netlink interface") Fixes: 831119f88781 ("mctp: Add neighbour netlink interface") Fixes: 06d2f4c583a7 ("mctp: Add netlink route management") Signed-off-by: Kuniyuki Iwashima kuniyu@amazon.com Reviewed-by: Jeremy Kerr jk@codeconstruct.com.au Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- include/net/mctp.h | 2 +- net/mctp/af_mctp.c | 6 +++++- net/mctp/device.c | 30 ++++++++++++++++++------------ net/mctp/neigh.c | 31 +++++++++++++++++++------------ net/mctp/route.c | 33 +++++++++++++++++++++++---------- 5 files changed, 66 insertions(+), 36 deletions(-)
diff --git a/include/net/mctp.h b/include/net/mctp.h index 7ed84054f4623..afeda2ad22d6d 100644 --- a/include/net/mctp.h +++ b/include/net/mctp.h @@ -293,7 +293,7 @@ void mctp_neigh_remove_dev(struct mctp_dev *mdev); int mctp_routes_init(void); void mctp_routes_exit(void);
-void mctp_device_init(void); +int mctp_device_init(void); void mctp_device_exit(void);
#endif /* __NET_MCTP_H */ diff --git a/net/mctp/af_mctp.c b/net/mctp/af_mctp.c index 3150f3f0c8725..2316e7772b785 100644 --- a/net/mctp/af_mctp.c +++ b/net/mctp/af_mctp.c @@ -677,10 +677,14 @@ static __init int mctp_init(void) if (rc) goto err_unreg_routes;
- mctp_device_init(); + rc = mctp_device_init(); + if (rc) + goto err_unreg_neigh;
return 0;
+err_unreg_neigh: + mctp_neigh_exit(); err_unreg_routes: mctp_routes_exit(); err_unreg_proto: diff --git a/net/mctp/device.c b/net/mctp/device.c index acb97b2574289..85cc5f31f1e7c 100644 --- a/net/mctp/device.c +++ b/net/mctp/device.c @@ -524,25 +524,31 @@ static struct notifier_block mctp_dev_nb = { .priority = ADDRCONF_NOTIFY_PRIORITY, };
-void __init mctp_device_init(void) +static const struct rtnl_msg_handler mctp_device_rtnl_msg_handlers[] = { + {THIS_MODULE, PF_MCTP, RTM_NEWADDR, mctp_rtm_newaddr, NULL, 0}, + {THIS_MODULE, PF_MCTP, RTM_DELADDR, mctp_rtm_deladdr, NULL, 0}, + {THIS_MODULE, PF_MCTP, RTM_GETADDR, NULL, mctp_dump_addrinfo, 0}, +}; + +int __init mctp_device_init(void) { - register_netdevice_notifier(&mctp_dev_nb); + int err;
- rtnl_register_module(THIS_MODULE, PF_MCTP, RTM_GETADDR, - NULL, mctp_dump_addrinfo, 0); - rtnl_register_module(THIS_MODULE, PF_MCTP, RTM_NEWADDR, - mctp_rtm_newaddr, NULL, 0); - rtnl_register_module(THIS_MODULE, PF_MCTP, RTM_DELADDR, - mctp_rtm_deladdr, NULL, 0); + register_netdevice_notifier(&mctp_dev_nb); rtnl_af_register(&mctp_af_ops); + + err = rtnl_register_many(mctp_device_rtnl_msg_handlers); + if (err) { + rtnl_af_unregister(&mctp_af_ops); + unregister_netdevice_notifier(&mctp_dev_nb); + } + + return err; }
void __exit mctp_device_exit(void) { + rtnl_unregister_many(mctp_device_rtnl_msg_handlers); rtnl_af_unregister(&mctp_af_ops); - rtnl_unregister(PF_MCTP, RTM_DELADDR); - rtnl_unregister(PF_MCTP, RTM_NEWADDR); - rtnl_unregister(PF_MCTP, RTM_GETADDR); - unregister_netdevice_notifier(&mctp_dev_nb); } diff --git a/net/mctp/neigh.c b/net/mctp/neigh.c index ffa0f9e0983fb..590f642413e4e 100644 --- a/net/mctp/neigh.c +++ b/net/mctp/neigh.c @@ -322,22 +322,29 @@ static struct pernet_operations mctp_net_ops = { .exit = mctp_neigh_net_exit, };
+static const struct rtnl_msg_handler mctp_neigh_rtnl_msg_handlers[] = { + {THIS_MODULE, PF_MCTP, RTM_NEWNEIGH, mctp_rtm_newneigh, NULL, 0}, + {THIS_MODULE, PF_MCTP, RTM_DELNEIGH, mctp_rtm_delneigh, NULL, 0}, + {THIS_MODULE, PF_MCTP, RTM_GETNEIGH, NULL, mctp_rtm_getneigh, 0}, +}; + int __init mctp_neigh_init(void) { - rtnl_register_module(THIS_MODULE, PF_MCTP, RTM_NEWNEIGH, - mctp_rtm_newneigh, NULL, 0); - rtnl_register_module(THIS_MODULE, PF_MCTP, RTM_DELNEIGH, - mctp_rtm_delneigh, NULL, 0); - rtnl_register_module(THIS_MODULE, PF_MCTP, RTM_GETNEIGH, - NULL, mctp_rtm_getneigh, 0); - - return register_pernet_subsys(&mctp_net_ops); + int err; + + err = register_pernet_subsys(&mctp_net_ops); + if (err) + return err; + + err = rtnl_register_many(mctp_neigh_rtnl_msg_handlers); + if (err) + unregister_pernet_subsys(&mctp_net_ops); + + return err; }
-void __exit mctp_neigh_exit(void) +void mctp_neigh_exit(void) { + rtnl_unregister_many(mctp_neigh_rtnl_msg_handlers); unregister_pernet_subsys(&mctp_net_ops); - rtnl_unregister(PF_MCTP, RTM_GETNEIGH); - rtnl_unregister(PF_MCTP, RTM_DELNEIGH); - rtnl_unregister(PF_MCTP, RTM_NEWNEIGH); } diff --git a/net/mctp/route.c b/net/mctp/route.c index 05ab4fddc82e9..ea7cb9973128d 100644 --- a/net/mctp/route.c +++ b/net/mctp/route.c @@ -1413,26 +1413,39 @@ static struct pernet_operations mctp_net_ops = { .exit = mctp_routes_net_exit, };
+static const struct rtnl_msg_handler mctp_route_rtnl_msg_handlers[] = { + {THIS_MODULE, PF_MCTP, RTM_NEWROUTE, mctp_newroute, NULL, 0}, + {THIS_MODULE, PF_MCTP, RTM_DELROUTE, mctp_delroute, NULL, 0}, + {THIS_MODULE, PF_MCTP, RTM_GETROUTE, NULL, mctp_dump_rtinfo, 0}, +}; + int __init mctp_routes_init(void) { + int err; + dev_add_pack(&mctp_packet_type);
- rtnl_register_module(THIS_MODULE, PF_MCTP, RTM_GETROUTE, - NULL, mctp_dump_rtinfo, 0); - rtnl_register_module(THIS_MODULE, PF_MCTP, RTM_NEWROUTE, - mctp_newroute, NULL, 0); - rtnl_register_module(THIS_MODULE, PF_MCTP, RTM_DELROUTE, - mctp_delroute, NULL, 0); + err = register_pernet_subsys(&mctp_net_ops); + if (err) + goto err_pernet; + + err = rtnl_register_many(mctp_route_rtnl_msg_handlers); + if (err) + goto err_rtnl;
- return register_pernet_subsys(&mctp_net_ops); + return 0; + +err_rtnl: + unregister_pernet_subsys(&mctp_net_ops); +err_pernet: + dev_remove_pack(&mctp_packet_type); + return err; }
void mctp_routes_exit(void) { + rtnl_unregister_many(mctp_route_rtnl_msg_handlers); unregister_pernet_subsys(&mctp_net_ops); - rtnl_unregister(PF_MCTP, RTM_DELROUTE); - rtnl_unregister(PF_MCTP, RTM_NEWROUTE); - rtnl_unregister(PF_MCTP, RTM_GETROUTE); dev_remove_pack(&mctp_packet_type); }