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ksmbd: keep TCP timers alive for kernel sockets

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ksmbd creates its listening socket with sock_create_kern(). Kernel
sockets do not hold a network namespace reference by default. Accepted
sockets inherit this state.

When an accepted socket is released, tcp_close() clears its pending TCP
timers for a kernel socket after the socket enters an orphaned state. If
the peer is unreachable while ksmbd sends a FIN, this can leave a
FIN-WAIT-1 orphan without a retransmission timer.

Upgrade the listening socket's network namespace reference before
kernel_listen(). Accepted sockets inherit the reference, so the TCP
stack can keep the retransmission timer active and apply its normal
orphan retry policy.

Preserve the existing graceful shutdown behavior.

Link: https://github.com/openwrt/openwrt/issues/24744
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
This commit is contained in:
Namjae Jeon 2026-08-20 08:26:03 +09:00
parent 56549c18a4
commit 80b6367ec3
1 changed files with 6 additions and 0 deletions
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6
fs/smb/server/transport_tcp.c
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@ -523,6 +523,12 @@ static int create_socket(struct interface *iface)
goto out_error;
}
/*
* Accepted sockets inherit the listener's net reference. Keep TCP
* timers alive after a kernel socket is released.
*/
sk_net_refcnt_upgrade(ksmbd_socket->sk);
ret = kernel_listen(ksmbd_socket, KSMBD_SOCKET_BACKLOG);
if (ret) {
pr_err("Port listen() error: %d\n", ret);