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Merge branch 'devlink-fixes-for-port-and-reporter-field-access'

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Parav Pandit says:

====================
devlink fixes for port and reporter field access

These series contains two small fixes of devlink.

Patch-1 initializes port reporter fields early enough to
avoid access before initialized error.
Patch-2 protects port list lock during traversal.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2020-08-24 16:02:47 -07:00
commit 37a319b5f9
1 changed files with 7 additions and 4 deletions
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11
net/core/devlink.c
View file

@ -5895,6 +5895,7 @@ devlink_nl_cmd_health_reporter_get_dumpit(struct sk_buff *msg,
list_for_each_entry(devlink, &devlink_list, list) {
if (!net_eq(devlink_net(devlink), sock_net(msg->sk)))
continue;
mutex_lock(&devlink->lock);
list_for_each_entry(port, &devlink->port_list, list) {
mutex_lock(&port->reporters_lock);
list_for_each_entry(reporter, &port->reporter_list, list) {
@ -5909,12 +5910,14 @@ devlink_nl_cmd_health_reporter_get_dumpit(struct sk_buff *msg,
NLM_F_MULTI);
if (err) {
mutex_unlock(&port->reporters_lock);
mutex_unlock(&devlink->lock);
goto out;
}
idx++;
}
mutex_unlock(&port->reporters_lock);
}
mutex_unlock(&devlink->lock);
}
out:
mutex_unlock(&devlink_mutex);
@ -7555,11 +7558,11 @@ 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 +7579,13 @@ 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);