Commit d9a33cadc70a for kernel

commit d9a33cadc70a94c1582f65e6042e81027cd200c6
Author: Minhong He <heminhong@kylinos.cn>
Date:   Mon Jul 20 15:25:18 2026 +0800

    mctp: check register_netdevice_notifier() error in mctp_device_init()

    mctp_device_init() handles errors from rtnl_af_register() and
    rtnl_register_many(), but ignores the return value of
    register_netdevice_notifier(). If notifier registration fails, init can
    still return success while the module is only partially initialized.

    Check the notifier registration error and fail module init early.

    Fixes: 583be982d934 ("mctp: Add device handling and netlink interface")
    Signed-off-by: Minhong He <heminhong@kylinos.cn>
    Link: https://patch.msgid.link/20260720072518.112614-1-heminhong@kylinos.cn
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/mctp/device.c b/net/mctp/device.c
index 2c84df674669..822120e860c8 100644
--- a/net/mctp/device.c
+++ b/net/mctp/device.c
@@ -536,7 +536,9 @@ int __init mctp_device_init(void)
 {
 	int err;

-	register_netdevice_notifier(&mctp_dev_nb);
+	err = register_netdevice_notifier(&mctp_dev_nb);
+	if (err)
+		return err;

 	err = rtnl_af_register(&mctp_af_ops);
 	if (err)