6.6-stable review patch. If anyone has any objections, please let me know.
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From: Kuniyuki Iwashima kuniyu@amazon.com
[ Upstream commit 5be2062e3080e3ff6707816caa445ec0c6eaacf7 ]
Since introduced, mpls_init() 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: 03c0566542f4 ("mpls: Netlink commands to add, remove, and dump routes") Signed-off-by: Kuniyuki Iwashima kuniyu@amazon.com Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- net/mpls/af_mpls.c | 32 +++++++++++++++++++++----------- 1 file changed, 21 insertions(+), 11 deletions(-)
diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c index ba034fcd59f0d..43e8343df0db7 100644 --- a/net/mpls/af_mpls.c +++ b/net/mpls/af_mpls.c @@ -2729,6 +2729,15 @@ static struct rtnl_af_ops mpls_af_ops __read_mostly = { .get_stats_af_size = mpls_get_stats_af_size, };
+static const struct rtnl_msg_handler mpls_rtnl_msg_handlers[] __initdata_or_module = { + {THIS_MODULE, PF_MPLS, RTM_NEWROUTE, mpls_rtm_newroute, NULL, 0}, + {THIS_MODULE, PF_MPLS, RTM_DELROUTE, mpls_rtm_delroute, NULL, 0}, + {THIS_MODULE, PF_MPLS, RTM_GETROUTE, mpls_getroute, mpls_dump_routes, 0}, + {THIS_MODULE, PF_MPLS, RTM_GETNETCONF, + mpls_netconf_get_devconf, mpls_netconf_dump_devconf, + RTNL_FLAG_DUMP_UNLOCKED}, +}; + static int __init mpls_init(void) { int err; @@ -2747,24 +2756,25 @@ static int __init mpls_init(void)
rtnl_af_register(&mpls_af_ops);
- rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_NEWROUTE, - mpls_rtm_newroute, NULL, 0); - rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_DELROUTE, - mpls_rtm_delroute, NULL, 0); - rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETROUTE, - mpls_getroute, mpls_dump_routes, 0); - rtnl_register_module(THIS_MODULE, PF_MPLS, RTM_GETNETCONF, - mpls_netconf_get_devconf, - mpls_netconf_dump_devconf, - RTNL_FLAG_DUMP_UNLOCKED); - err = ipgre_tunnel_encap_add_mpls_ops(); + err = rtnl_register_many(mpls_rtnl_msg_handlers); if (err) + goto out_unregister_rtnl_af; + + err = ipgre_tunnel_encap_add_mpls_ops(); + if (err) { pr_err("Can't add mpls over gre tunnel ops\n"); + goto out_unregister_rtnl; + }
err = 0; out: return err;
+out_unregister_rtnl: + rtnl_unregister_many(mpls_rtnl_msg_handlers); +out_unregister_rtnl_af: + rtnl_af_unregister(&mpls_af_ops); + dev_remove_pack(&mpls_packet_type); out_unregister_pernet: unregister_pernet_subsys(&mpls_net_ops); goto out;