devlink: Fix per port reporter fields initialization

Cited patch in fixes tag initializes reporters_list and reporters_lock
of a devlink port after devlink port is added to the list. Once port
is added to the list, devlink_nl_cmd_health_reporter_get_dumpit()
can access the uninitialized mutex and reporters list head.
Fix it by initializing port reporters field before adding port to the
list.

Fixes: f4f541660121 ("devlink: Implement devlink health reporters on per-port basis")
Signed-off-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/devlink.c b/net/core/devlink.c
index e5feb87beca7c48772ad07dec5777bd89c0d7947..9b01f7245fd877b715a1dd4d8ecdb926be82f41c 100644 (file)
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -7555,11 +7555,11 @@ int devlink_port_register(struct devlink *devlink,
        devlink_port->index = port_index;
        devlink_port->registered = true;
        spin_lock_init(&devlink_port->type_lock);
+       INIT_LIST_HEAD(&devlink_port->reporter_list);
+       mutex_init(&devlink_port->reporters_lock);
        list_add_tail(&devlink_port->list, &devlink->port_list);
        INIT_LIST_HEAD(&devlink_port->param_list);
        mutex_unlock(&devlink->lock);
-       INIT_LIST_HEAD(&devlink_port->reporter_list);
-       mutex_init(&devlink_port->reporters_lock);
        INIT_DELAYED_WORK(&devlink_port->type_warn_dw, &devlink_port_type_warn);
        devlink_port_type_warn_schedule(devlink_port);
        devlink_port_notify(devlink_port, DEVLINK_CMD_PORT_NEW);
@@ -7576,13 +7576,13 @@ void devlink_port_unregister(struct devlink_port *devlink_port)
 {
        struct devlink *devlink = devlink_port->devlink;
 
-       WARN_ON(!list_empty(&devlink_port->reporter_list));
-       mutex_destroy(&devlink_port->reporters_lock);
        devlink_port_type_warn_cancel(devlink_port);
        devlink_port_notify(devlink_port, DEVLINK_CMD_PORT_DEL);
        mutex_lock(&devlink->lock);
        list_del(&devlink_port->list);
        mutex_unlock(&devlink->lock);
+       WARN_ON(!list_empty(&devlink_port->reporter_list));
+       mutex_destroy(&devlink_port->reporters_lock);
 }
 EXPORT_SYMBOL_GPL(devlink_port_unregister);