From nobody Fri Nov 22 08:00:52 2024 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id ED6711E871; Wed, 4 Sep 2024 14:35:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725460511; cv=none; b=ngGqhBMeQMKm/yKnNHj6QrZ39CU3z/Np3FeSY7UStHnj5F4Le1ZxV83rWXOIM9eJ+q7KxYhuLHbkWUOcMHBgmP1UGGGRRMTuDZdeZCb5fxQqMAaMwUjZggJyQ8LaFDdIvyJ2og5kWEdtT/r4rG7FLogvxCVYbZoNvCLV7DS8Www= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725460511; c=relaxed/simple; bh=SnR3kvW+vA768JvqtlKXxXagQUs8iuwW0vT5vOcqhDk=; h=Subject:To:Cc:From:Date:In-Reply-To:Message-ID:MIME-Version: Content-Type; b=H6m0CFWA3TPMBpn+t0hKFu0zBro8Ogd/6o7R4aYk/0aT1y9aCy7ZjzYdPZO+2TlBv6Uglbi/5PVeumFwpFW+yyh4ccpYdT9lnxDCrOyaPLE9WS36oWB+h4anE5XncfY0FGJmbzkhTPPg5pgEH/QSvxHDlKMXeoHM/s4idkJ3zwM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=l7GGgevd; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="l7GGgevd" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 74694C4CEC2; Wed, 4 Sep 2024 14:35:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1725460510; bh=SnR3kvW+vA768JvqtlKXxXagQUs8iuwW0vT5vOcqhDk=; h=Subject:To:Cc:From:Date:In-Reply-To:From; b=l7GGgevdXXzqdtdJQlOjlWzgKUHamItCVP4L1zyb8eb7hTnzqNVxyc6d5hspa/zk9 fifmXeEuOxYZcCZ7Znk4MposjA8zhLd0b/FcoY69hwMAFix2EL63PjeOIQxGI8twQh 98CTXxsDklQ6eL2+0hVUEZXWy20OhPFj0Biutdc0= Subject: Patch "mptcp: avoid duplicated SUB_CLOSED events" has been added to the 6.1-stable tree To: arinc.unal@arinc9.com,gregkh@linuxfoundation.org,martineau@kernel.org,matttbe@kernel.org,mptcp@lists.linux.dev,pabeni@redhat.com Cc: From: Date: Wed, 04 Sep 2024 16:35:08 +0200 In-Reply-To: <20240904111113.4092725-2-matttbe@kernel.org> Message-ID: <2024090407-dayroom-sherry-f10c@gregkh> Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-stable: commit X-Patchwork-Hint: ignore This is a note to let you know that I've just added the patch titled mptcp: avoid duplicated SUB_CLOSED events to the 6.1-stable tree which can be found at: http://www.kernel.org/git/?p=3Dlinux/kernel/git/stable/stable-queue.git= ;a=3Dsummary The filename of the patch is: mptcp-avoid-duplicated-sub_closed-events.patch and it can be found in the queue-6.1 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. From stable+bounces-73016-greg=3Dkroah.com@vger.kernel.org Wed Sep 4 13:11= :38 2024 From: "Matthieu Baerts (NGI0)" Date: Wed, 4 Sep 2024 13:11:14 +0200 Subject: mptcp: avoid duplicated SUB_CLOSED events To: stable@vger.kernel.org, gregkh@linuxfoundation.org Cc: "MPTCP Upstream" , "Matthieu Baerts (NGI0)" , "Ar=C4=B1n=C3=A7 =C3=9CNAL" , "Mat= Martineau" , "Paolo Abeni" Message-ID: <20240904111113.4092725-2-matttbe@kernel.org> From: "Matthieu Baerts (NGI0)" commit d82809b6c5f2676b382f77a5cbeb1a5d91ed2235 upstream. The initial subflow might have already been closed, but still in the connection list. When the worker is instructed to close the subflows that have been marked as closed, it might then try to close the initial subflow again. A consequence of that is that the SUB_CLOSED event can be seen twice: # ip mptcp endpoint 1.1.1.1 id 1 subflow dev eth0 2.2.2.2 id 2 subflow dev eth1 # ip mptcp monitor & [ CREATED] remid=3D0 locid=3D0 saddr4=3D1.1.1.1 daddr4=3D9.9.9.9 [ ESTABLISHED] remid=3D0 locid=3D0 saddr4=3D1.1.1.1 daddr4=3D9.9.9.9 [ SF_ESTABLISHED] remid=3D0 locid=3D2 saddr4=3D2.2.2.2 daddr4=3D9.9.9.9 # ip mptcp endpoint delete id 1 [ SF_CLOSED] remid=3D0 locid=3D0 saddr4=3D1.1.1.1 daddr4=3D9.9.9.9 [ SF_CLOSED] remid=3D0 locid=3D0 saddr4=3D1.1.1.1 daddr4=3D9.9.9.9 The first one is coming from mptcp_pm_nl_rm_subflow_received(), and the second one from __mptcp_close_subflow(). To avoid doing the post-closed processing twice, the subflow is now marked as closed the first time. Note that it is not enough to check if we are dealing with the first subflow and check its sk_state: the subflow might have been reset or closed before calling mptcp_close_ssk(). Fixes: b911c97c7dc7 ("mptcp: add netlink event support") Cc: stable@vger.kernel.org Tested-by: Ar=C4=B1n=C3=A7 =C3=9CNAL Reviewed-by: Mat Martineau Signed-off-by: Matthieu Baerts (NGI0) Signed-off-by: Paolo Abeni [ Conflict in protocol.h due to commit f1f26512a9bf ("mptcp: use plain bool instead of custom binary enum"), commit dfc8d0603033 ("mptcp: implement delayed seq generation for passive fastopen") and more that are not in this version, because they modify the context and the size of __unused. The conflict is easy to resolve, by not only adding the new field (close_event_done), and __unused. ] Signed-off-by: Matthieu Baerts (NGI0) Signed-off-by: Greg Kroah-Hartman --- net/mptcp/protocol.c | 6 ++++++ net/mptcp/protocol.h | 4 +++- 2 files changed, 9 insertions(+), 1 deletion(-) --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -2503,6 +2503,12 @@ out: void mptcp_close_ssk(struct sock *sk, struct sock *ssk, struct mptcp_subflow_context *subflow) { + /* The first subflow can already be closed and still in the list */ + if (subflow->close_event_done) + return; + + subflow->close_event_done =3D true; + if (sk->sk_state =3D=3D TCP_ESTABLISHED) mptcp_event(MPTCP_EVENT_SUB_CLOSED, mptcp_sk(sk), ssk, GFP_KERNEL); =20 --- a/net/mptcp/protocol.h +++ b/net/mptcp/protocol.h @@ -479,7 +479,9 @@ struct mptcp_subflow_context { can_ack : 1, /* only after processing the remote a key */ disposable : 1, /* ctx can be free at ulp release time */ stale : 1, /* unable to snd/rcv data, do not use for xmit */ - valid_csum_seen : 1; /* at least one csum validated */ + valid_csum_seen : 1, /* at least one csum validated */ + close_event_done : 1, /* has done the post-closed part */ + __unused : 9; enum mptcp_data_avail data_avail; u32 remote_nonce; u64 thmac; Patches currently in stable-queue which might be from matttbe@kernel.org are queue-6.1/mptcp-pm-fix-rm_addr-id-for-the-initial-subflow.patch queue-6.1/selftests-mptcp-join-validate-fullmesh-endp-on-1st-sf.patch queue-6.1/mptcp-pm-fix-id-0-endp-usage-after-multiple-re-creations.patch queue-6.1/mptcp-make-pm_remove_addrs_and_subflows-static.patch queue-6.1/mptcp-pm-avoid-possible-uaf-when-selecting-endp.patch queue-6.1/mptcp-pm-reuse-id-0-after-delete-and-re-add.patch queue-6.1/selftests-mptcp-join-check-re-adding-init-endp-with-id.patch queue-6.1/selftests-mptcp-join-test-for-flush-re-add-endpoints.patch queue-6.1/selftests-mptcp-add-explicit-test-case-for-remove-re.patch queue-6.1/mptcp-avoid-duplicated-sub_closed-events.patch queue-6.1/selftests-mptcp-add-explicit-test-case-for-remove-readd.patch queue-6.1/selftests-mptcp-join-check-re-adding-init-endp-with-.patch queue-6.1/selftests-mptcp-join-check-re-using-id-of-closed-subflow.patch queue-6.1/mptcp-pm-fullmesh-select-the-right-id-later.patch queue-6.1/mptcp-pr_debug-add-missing-n-at-the-end.patch queue-6.1/selftests-mptcp-join-check-re-using-id-of-unused-add.patch queue-6.1/selftests-mptcp-join-check-re-using-id-of-unused-add_addr.patch