MPTCP: fix lock class name family in pm_nl_create_listen_socket

From: Li Xiasong <[email protected]>

commit 7ab4a7c5d969642782b8a5b608da0dd02aa9f229 upstream.

In mptcp_pm_nl_create_listen_socket(), use entry->addr.family instead of sk->sk_family for lock class setup. The 'sk' parameter is a netlink socket, not the MPTCP subflow socket being created.

[ Conflict in pm_kernel.c, because commit 8617e85e04bd ("mptcp: pm:
split in-kernel PM specific code") is not in this version, and moves code from pm_netlink.c to pm_kernel.c. ]

---
 net/mptcp/pm_netlink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index 634fe0360c49..03e9a861140c 100644
@@ -1042,7 +1042,7 @@ static struct lock_class_key mptcp_keys[2];
 static int mptcp_pm_nl_create_listen_socket(struct sock *sk,
 					    struct mptcp_pm_addr_entry *entry)
 {
-	bool is_ipv6 = sk->sk_family == AF_INET6;
+	bool is_ipv6 = entry->addr.family == AF_INET6;
 	int addrlen = sizeof(struct sockaddr_in);
 	struct sockaddr_storage addr;
 	struct socket *ssock;

2.53.0

This is a note to let you know that I've just added the patch titled

MPTCP: fix lock class name family in pm_nl_create_listen_socket

to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
mptcp-fix-lock-class-name-family-in-pm_nl_create_listen_socket.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From [email protected] Thu Apr 2 19:42:24 2026
From: "Matthieu Baerts (NGI0)" <[email protected]>
Date: Thu, 2 Apr 2026 19:42:01 +0200
Subject: MPTCP: fix lock class name family in pm_nl_create_listen_socket
To: [email protected], [email protected]
Cc: MPTCP Upstream <[email protected]>, Li Xiasong <[email protected]>, "Matthieu Baerts (NGI0)" <[email protected]>, Jakub Kicinski <[email protected]>
Message-ID: <[email protected]>

From: Li Xiasong <[email protected]>

commit 7ab4a7c5d969642782b8a5b608da0dd02aa9f229 upstream.

In mptcp_pm_nl_create_listen_socket(), use entry->addr.family instead of sk->sk_family for lock class setup. The 'sk' parameter is a netlink socket, not the MPTCP subflow socket being created.

[ Conflict in pm_kernel.c, because commit 8617e85e04bd ("mptcp: pm:
split in-kernel PM specific code") is not in this version, and moves code from pm_netlink.c to pm_kernel.c. ]

---
 net/mptcp/pm_netlink.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -1041,7 +1041,7 @@ static struct lock_class_key mptcp_keys[
 static int mptcp_pm_nl_create_listen_socket(struct sock *sk,
 					    struct mptcp_pm_addr_entry *entry)
 {
-	bool is_ipv6 = sk->sk_family == AF_INET6;
+	bool is_ipv6 = entry->addr.family == AF_INET6;
 	int addrlen = sizeof(struct sockaddr_in);
 	struct sockaddr_storage addr;
 	struct socket *ssock;

Patches currently in stable-queue which might be from [email protected] are

queue-5.15/mptcp-fix-lock-class-name-family-in-pm_nl_create_listen_socket.patch