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mlxsw: core: Unpublish devlink parameters during reload 

The devlink parameter "acl_region_rehash_interval" is a runtime
parameter whose value is stored in a dynamically allocated memory. While
reloading the driver, this memory is freed and then allocated again. A
use-after-free might happen if during this time frame someone tries to
retrieve its value.

Since commit 070c63f20f ("net: devlink: allow to change namespaces
during reload") the use-after-free can be reliably triggered when
reloading the driver into a namespace, as after freeing the memory (via
reload_down() callback) all the parameters are notified.

Fix this by unpublishing and then re-publishing the parameters during
reload.

Fixes: 98bbf70c1c ("mlxsw: spectrum: add "acl_region_rehash_interval" devlink param")
Fixes: 7c62cfb8c5 ("devlink: publish params only after driver init is done")
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko 2019-10-30 11:04:22 +02:00 committed by David S. Miller
parent c63b096894
commit b7265a0df8
1 changed files with 2 additions and 2 deletions
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4
drivers/net/ethernet/mellanox/mlxsw/core.c
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@ -1186,7 +1186,7 @@ __mlxsw_core_bus_device_register(const struct mlxsw_bus_info *mlxsw_bus_info,
if (err)
goto err_thermal_init;
if (mlxsw_driver->params_register && !reload)
if (mlxsw_driver->params_register)
devlink_params_publish(devlink);
return 0;
@ -1259,7 +1259,7 @@ void mlxsw_core_bus_device_unregister(struct mlxsw_core *mlxsw_core,
return;
}
if (mlxsw_core->driver->params_unregister && !reload)
if (mlxsw_core->driver->params_unregister)
devlink_params_unpublish(devlink);
mlxsw_thermal_fini(mlxsw_core->thermal);
mlxsw_hwmon_fini(mlxsw_core->hwmon);