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Merge branch 'mptcp-more-fixes-for-6-1'

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Matthieu Baerts says:

====================
mptcp: More fixes for 6.1

Patch 1 makes sure data received after a close will still be processed
and acked as exepected. This is a regression for a commit introduced
in v5.11.

Patch 2 fixes a kernel deadlock found when working on validating TFO
with a listener MPTCP socket. This is not directly linked to TFO but
it is easier to reproduce the issue with it. This fixes a bug introduced
by a commit from v6.0.
====================

Link: https://lore.kernel.org/r/20221128154239.1999234-1-matthieu.baerts@tessares.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2022-11-28 18:03:11 -08:00
commit ce2e1c6d90
2 changed files with 9 additions and 10 deletions
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13
net/mptcp/protocol.c
View file

@ -2354,12 +2354,7 @@ static void __mptcp_close_ssk(struct sock *sk, struct sock *ssk,
goto out;
}
/* if we are invoked by the msk cleanup code, the subflow is
* already orphaned
*/
if (ssk->sk_socket)
sock_orphan(ssk);
sock_orphan(ssk);
subflow->disposable = 1;
/* if ssk hit tcp_done(), tcp_cleanup_ulp() cleared the related ops
@ -2940,7 +2935,11 @@ cleanup:
if (ssk == msk->first)
subflow->fail_tout = 0;
sock_orphan(ssk);
/* detach from the parent socket, but allow data_ready to
* push incoming data into the mptcp stack, to properly ack it
*/
ssk->sk_socket = NULL;
ssk->sk_wq = NULL;
unlock_sock_fast(ssk, slow);
}
sock_orphan(sk);

6
net/mptcp/subflow.c
View file

@ -1745,16 +1745,16 @@ void mptcp_subflow_queue_clean(struct sock *listener_ssk)
for (msk = head; msk; msk = next) {
struct sock *sk = (struct sock *)msk;
bool slow, do_cancel_work;
bool do_cancel_work;
sock_hold(sk);
slow = lock_sock_fast_nested(sk);
lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
next = msk->dl_next;
msk->first = NULL;
msk->dl_next = NULL;
do_cancel_work = __mptcp_close(sk, 0);
unlock_sock_fast(sk, slow);
release_sock(sk);
if (do_cancel_work)
mptcp_cancel_work(sk);
sock_put(sk);