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mptcp: keep snd_una updated for fallback socket

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After shutdown, for fallback MPTCP sockets, we always have

write_seq == snd_una+1

The above will foul OUTQ ioctl(). Keep snd_una in sync with
write_seq even after shutdown.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2022-01-06 16:20:14 -08:00 committed by David S. Miller
parent 26abf15c49
commit 58cd405b83
1 changed files with 1 additions and 0 deletions
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1
net/mptcp/protocol.c
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@ -2666,6 +2666,7 @@ static void __mptcp_check_send_data_fin(struct sock *sk)
* state now
*/
if (__mptcp_check_fallback(msk)) {
WRITE_ONCE(msk->snd_una, msk->write_seq);
if ((1 << sk->sk_state) & (TCPF_CLOSING | TCPF_LAST_ACK)) {
inet_sk_state_store(sk, TCP_CLOSE);
mptcp_close_wake_up(sk);