diff mbox series

[net-next,1/2] devlink: Fix per port reporter fields initialization

Message ID 20200821191221.82522-2-parav@mellanox.com
State Accepted
Delegated to: David Miller
Headers show
Series devlink fixes for port and reporter field access | expand

Commit Message

Parav Pandit Aug. 21, 2020, 7:12 p.m. UTC 
From: Parav Pandit <parav@nvidia.com>

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>
---
 net/core/devlink.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/net/core/devlink.c b/net/core/devlink.c
index e5feb87beca7..9b01f7245fd8 100644
--- 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);