netdev - [PATCH v2 net-next 09/12] ipv4: fib: Hold rtnl_net_lock() for ip_fib_net

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Message-ID: <20250226192556.21633-10-kuniyu@amazon.com>
Date: Wed, 26 Feb 2025 11:25:53 -0800
From: Kuniyuki Iwashima <kuniyu@...zon.com>
To: "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>, Simon Horman <horms@...nel.org>
CC: Kuniyuki Iwashima <kuniyu@...zon.com>, Kuniyuki Iwashima
	<kuni1840@...il.com>, <netdev@...r.kernel.org>
Subject: [PATCH v2 net-next 09/12] ipv4: fib: Hold rtnl_net_lock() for ip_fib_net_exit().

ip_fib_net_exit() requires RTNL and is called from fib_net_init()
and fib_net_exit_batch().

Let's hold rtnl_net_lock() before ip_fib_net_exit().

Signed-off-by: Kuniyuki Iwashima <kuniyu@...zon.com>
Reviewed-by: Eric Dumazet <edumazet@...gle.com>
---
 net/ipv4/fib_frontend.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index 40c062f820f2..c48ed369b179 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -1575,7 +1575,7 @@ static void ip_fib_net_exit(struct net *net)
 {
 	int i;
 
-	ASSERT_RTNL();
+	ASSERT_RTNL_NET(net);
 #ifdef CONFIG_IP_MULTIPLE_TABLES
 	RCU_INIT_POINTER(net->ipv4.fib_main, NULL);
 	RCU_INIT_POINTER(net->ipv4.fib_default, NULL);
@@ -1635,9 +1635,9 @@ static int __net_init fib_net_init(struct net *net)
 out_nlfl:
 	fib4_semantics_exit(net);
 out_semantics:
-	rtnl_lock();
+	rtnl_net_lock(net);
 	ip_fib_net_exit(net);
-	rtnl_unlock();
+	rtnl_net_unlock(net);
 	goto out;
 }
 
@@ -1652,9 +1652,11 @@ static void __net_exit fib_net_exit_batch(struct list_head *net_list)
 	struct net *net;
 
 	rtnl_lock();
-	list_for_each_entry(net, net_list, exit_list)
+	list_for_each_entry(net, net_list, exit_list) {
+		__rtnl_net_lock(net);
 		ip_fib_net_exit(net);
-
+		__rtnl_net_unlock(net);
+	}
 	rtnl_unlock();
 
 	list_for_each_entry(net, net_list, exit_list)
-- 
2.39.5 (Apple Git-154)