netdev - [PATCHv3 net 3/3] ipv6: sr: fix invalid unregister error path

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Date: Thu,  9 May 2024 21:18:12 +0800
From: Hangbin Liu <liuhangbin@...il.com>
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
	David Ahern <dsahern@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Vasiliy Kovalev <kovalev@...linux.org>,
	Sabrina Dubroca <sd@...asysnail.net>,
	Guillaume Nault <gnault@...hat.com>,
	Simon Horman <horms@...nel.org>,
	David Lebrun <david.lebrun@...ouvain.be>,
	Hangbin Liu <liuhangbin@...il.com>
Subject: [PATCHv3 net 3/3] ipv6: sr: fix invalid unregister error path

The error path of seg6_init() is wrong in case CONFIG_IPV6_SEG6_LWTUNNEL
is not defined. In that case if seg6_hmac_init() fails, the
genl_unregister_family() isn't called.

This issue exist since commit 46738b1317e1 ("ipv6: sr: add option to control
lwtunnel support"), and commit 5559cea2d5aa ("ipv6: sr: fix possible
use-after-free and null-ptr-deref") replaced unregister_pernet_subsys()
with genl_unregister_family() in this error path.

Fixes: 46738b1317e1 ("ipv6: sr: add option to control lwtunnel support")
Reported-by: Guillaume Nault <gnault@...hat.com>
Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
---
 net/ipv6/seg6.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ipv6/seg6.c b/net/ipv6/seg6.c
index c4ef96c8fdac..a31521e270f7 100644
--- a/net/ipv6/seg6.c
+++ b/net/ipv6/seg6.c
@@ -551,6 +551,8 @@ int __init seg6_init(void)
 #endif
 #ifdef CONFIG_IPV6_SEG6_LWTUNNEL
 out_unregister_genl:
+#endif
+#if IS_ENABLED(CONFIG_IPV6_SEG6_LWTUNNEL) || IS_ENABLED(CONFIG_IPV6_SEG6_HMAC)
 	genl_unregister_family(&seg6_genl_family);
 #endif
 out_unregister_pernet:
-- 
2.43.0