From 69f9f55891effd5a6d0de3e7ebb28a37bd162382 Mon Sep 17 00:00:00 2001 From: Felix Maurer Date: Fri, 15 Mar 2024 13:04:52 +0100 Subject: [PATCH] hsr: Handle failures in module init [ Upstream commit 3cf28cd492308e5f63ed00b29ea03ca016264376 ] A failure during registration of the netdev notifier was not handled at all. A failure during netlink initialization did not unregister the netdev notifier. Handle failures of netdev notifier registration and netlink initialization. Both functions should only return negative values on failure and thereby lead to the hsr module not being loaded. Fixes: f421436a591d ("net/hsr: Add support for the High-availability Seamless Redundancy protocol (HSRv0)") Signed-off-by: Felix Maurer Reviewed-by: Shigeru Yoshida Reviewed-by: Breno Leitao Link: https://lore.kernel.org/r/3ce097c15e3f7ace98fc7fd9bcbf299f092e63d1.1710504184.git.fmaurer@redhat.com Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- net/hsr/hsr_main.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/net/hsr/hsr_main.c b/net/hsr/hsr_main.c index 9e389accbfc7..ea627e532aab 100644 --- a/net/hsr/hsr_main.c +++ b/net/hsr/hsr_main.c @@ -113,14 +113,21 @@ static struct notifier_block hsr_nb = { static int __init hsr_init(void) { - int res; + int err; BUILD_BUG_ON(sizeof(struct hsr_tag) != HSR_HLEN); - register_netdevice_notifier(&hsr_nb); - res = hsr_netlink_init(); + err = register_netdevice_notifier(&hsr_nb); + if (err) + return err; - return res; + err = hsr_netlink_init(); + if (err) { + unregister_netdevice_notifier(&hsr_nb); + return err; + } + + return 0; } static void __exit hsr_exit(void)