releases/6.8.2/hsr-handle-failures-in-module-init.patch

From e1d69b9872c31cd6d179ac5e26105557273d4f32 Mon Sep 17 00:00:00 2001
From: Sasha Levin <sashal@kernel.org>
Date: Fri, 15 Mar 2024 13:04:52 +0100
Subject: hsr: Handle failures in module init

From: Felix Maurer <fmaurer@redhat.com>

[ 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 <fmaurer@redhat.com>
Reviewed-by: Shigeru Yoshida <syoshida@redhat.com>
Reviewed-by: Breno Leitao <leitao@debian.org>
Link: https://lore.kernel.org/r/3ce097c15e3f7ace98fc7fd9bcbf299f092e63d1.1710504184.git.fmaurer@redhat.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 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 cb83c8feb7465..9756e657bab97 100644
--- a/net/hsr/hsr_main.c
+++ b/net/hsr/hsr_main.c
@@ -148,14 +148,21 @@ 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;
+
+	err = hsr_netlink_init();
+	if (err) {
+		unregister_netdevice_notifier(&hsr_nb);
+		return err;
+	}
 
-	return res;
+	return 0;
 }
 
 static void __exit hsr_exit(void)
-- 
2.43.0