From f524b7289bbb0c8ffaa2ba3c34c146e43da54fb2 Mon Sep 17 00:00:00 2001
From: Yuan Can <yuancan@huawei.com>
Date: Mon, 14 Nov 2022 14:22:25 +0000
Subject: [PATCH] net: thunderbolt: Fix error handling in tbnet_init()
Git-commit: f524b7289bbb0c8ffaa2ba3c34c146e43da54fb2
Patch-mainline: v6.1-rc6
References: git-fixes
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: e69b6c02b4c3 ("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>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/net/thunderbolt.c | 19 ++++++++++++++-----
1 file changed, 14 insertions(+), 5 deletions(-)
--- a/drivers/net/thunderbolt.c
+++ b/drivers/net/thunderbolt.c
@@ -1377,12 +1377,21 @@ static int __init tbnet_init(void)
TBNET_MATCH_FRAGS_ID | TBNET_64K_FRAMES);
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);