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 78b7b991838a4a6baeaad934addc4db2c5917eb8 ]
Since introduced, vxlan_vnifilter_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: f9c4bb0b245c ("vxlan: vni filtering support on collect metadata device") Signed-off-by: Kuniyuki Iwashima kuniyu@amazon.com Reviewed-by: Nikolay Aleksandrov razor@blackwall.org Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/vxlan/vxlan_core.c | 6 +++++- drivers/net/vxlan/vxlan_private.h | 2 +- drivers/net/vxlan/vxlan_vnifilter.c | 19 +++++++++---------- 3 files changed, 15 insertions(+), 12 deletions(-)
diff --git a/drivers/net/vxlan/vxlan_core.c b/drivers/net/vxlan/vxlan_core.c index 61224a5a877cb..155d335c80a7e 100644 --- a/drivers/net/vxlan/vxlan_core.c +++ b/drivers/net/vxlan/vxlan_core.c @@ -4803,9 +4803,13 @@ static int __init vxlan_init_module(void) if (rc) goto out4;
- vxlan_vnifilter_init(); + rc = vxlan_vnifilter_init(); + if (rc) + goto out5;
return 0; +out5: + rtnl_link_unregister(&vxlan_link_ops); out4: unregister_switchdev_notifier(&vxlan_switchdev_notifier_block); out3: diff --git a/drivers/net/vxlan/vxlan_private.h b/drivers/net/vxlan/vxlan_private.h index 599c3b4fdd5ed..b0e8c6d290579 100644 --- a/drivers/net/vxlan/vxlan_private.h +++ b/drivers/net/vxlan/vxlan_private.h @@ -134,7 +134,7 @@ int vxlan_vni_in_use(struct net *src_net, struct vxlan_dev *vxlan, int vxlan_vnigroup_init(struct vxlan_dev *vxlan); void vxlan_vnigroup_uninit(struct vxlan_dev *vxlan);
-void vxlan_vnifilter_init(void); +int vxlan_vnifilter_init(void); void vxlan_vnifilter_uninit(void); void vxlan_vnifilter_count(struct vxlan_dev *vxlan, __be32 vni, struct vxlan_vni_node *vninode, diff --git a/drivers/net/vxlan/vxlan_vnifilter.c b/drivers/net/vxlan/vxlan_vnifilter.c index c5cf55030158f..3d113d709d194 100644 --- a/drivers/net/vxlan/vxlan_vnifilter.c +++ b/drivers/net/vxlan/vxlan_vnifilter.c @@ -992,19 +992,18 @@ static int vxlan_vnifilter_process(struct sk_buff *skb, struct nlmsghdr *nlh, return err; }
-void vxlan_vnifilter_init(void) +static const struct rtnl_msg_handler vxlan_vnifilter_rtnl_msg_handlers[] = { + {THIS_MODULE, PF_BRIDGE, RTM_GETTUNNEL, NULL, vxlan_vnifilter_dump, 0}, + {THIS_MODULE, PF_BRIDGE, RTM_NEWTUNNEL, vxlan_vnifilter_process, NULL, 0}, + {THIS_MODULE, PF_BRIDGE, RTM_DELTUNNEL, vxlan_vnifilter_process, NULL, 0}, +}; + +int vxlan_vnifilter_init(void) { - rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_GETTUNNEL, NULL, - vxlan_vnifilter_dump, 0); - rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_NEWTUNNEL, - vxlan_vnifilter_process, NULL, 0); - rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_DELTUNNEL, - vxlan_vnifilter_process, NULL, 0); + return rtnl_register_many(vxlan_vnifilter_rtnl_msg_handlers); }
void vxlan_vnifilter_uninit(void) { - rtnl_unregister(PF_BRIDGE, RTM_GETTUNNEL); - rtnl_unregister(PF_BRIDGE, RTM_NEWTUNNEL); - rtnl_unregister(PF_BRIDGE, RTM_DELTUNNEL); + rtnl_unregister_many(vxlan_vnifilter_rtnl_msg_handlers); }