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net: thunderbolt: Fix error handling in tbnet_init()

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A problem about insmod thunderbolt-net failed is triggered with following
log given while lsmod does not show thunderbolt_net:

 insmod: ERROR: could not insert module thunderbolt-net.ko: File exists

The reason is that tbnet_init() returns tb_register_service_driver()
directly without checking its return value, if tb_register_service_driver()
failed, it returns without removing property directory, resulting the
property directory can never be created later.

 tbnet_init()
   tb_register_property_dir() # register property directory
   tb_register_service_driver()
     driver_register()
       bus_add_driver()
         priv = kzalloc(...) # OOM happened
   # return without remove property directory

Fix by remove property directory when tb_register_service_driver() returns
error.

Fixes: e69b6c02b4 ("net: Add support for networking over Thunderbolt cable")
Signed-off-by: Yuan Can <yuancan@huawei.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yuan Can 2022-11-14 14:22:25 +00:00 committed by David S. Miller
parent e4aa85cf0d
commit f524b7289b
1 changed files with 14 additions and 5 deletions
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19
drivers/net/thunderbolt.c
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@ -1391,12 +1391,21 @@ static int __init tbnet_init(void)
tb_property_add_immediate(tbnet_dir, "prtcstns", flags);
ret = tb_register_property_dir("network", tbnet_dir);
if (ret) {
tb_property_free_dir(tbnet_dir);
return ret;
}
if (ret)
goto err_free_dir;
return tb_register_service_driver(&tbnet_driver);
ret = tb_register_service_driver(&tbnet_driver);
if (ret)
goto err_unregister;
return 0;
err_unregister:
tb_unregister_property_dir("network", tbnet_dir);
err_free_dir:
tb_property_free_dir(tbnet_dir);
return ret;
}
module_init(tbnet_init);