netdev - [PATCH net] hsr: Handle failures in module init

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Date: Thu, 14 Mar 2024 11:10:52 +0100
From: Felix Maurer <fmaurer@...hat.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	leitao@...ian.org
Subject: [PATCH net] hsr: Handle failures in module init

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.

Signed-off-by: Felix Maurer <fmaurer@...hat.com>
---
 net/hsr/hsr_main.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/net/hsr/hsr_main.c b/net/hsr/hsr_main.c
index cb83c8feb746..1c4a5b678688 100644
--- a/net/hsr/hsr_main.c
+++ b/net/hsr/hsr_main.c
@@ -148,14 +148,24 @@ 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)
+		goto out;
+
+	err = hsr_netlink_init();
+	if (err)
+		goto cleanup;
 
-	return res;
+	return 0;
+
+cleanup:
+	unregister_netdevice_notifier(&hsr_nb);
+out:
+	return err;
 }
 
 static void __exit hsr_exit(void)
-- 
2.44.0