From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794049678; b=eAJOYrhzs60vjlpYeJm1iHRttVkm43BZ5yMTQmFuK21IddYh8n4j8nSnKXsN1MV4RXbY zkS0YSXvrB9IQpptlthuhhT7jCLfPtQgDRCj8TKi9snMO0wiO9+H1JzIRPhJvpV/EedJq k8zlnr+L23oZTPig50zfdzikgwoFxfRtsKxsyIqYGh/E+2C9aT49vXPWpZLQddUjL+GRz mcNP63GWOhj6OwwF9431kNprvSVNs8dC++NDaeHHhrHN2v61Ko1jL6mZdWnJAgxswAsLJ aIBdNTjbWQs49hIkR9P/qaJ6EEdJVBgfNzjbNjcygST8mQ36tcZSxxDwITTRZ9C071Q== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794049678; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: MIME-Version:Content-Type:Content-Transfer-Encoding; bh=D2tOQJKEo6HGVh7kZUmIps9cczDldjJxxQtVmDexUcs=; b=plerok3akJWlmQeD6OB7eALJA/XTKOz2xm2zBKmK7qVBq//h4ofHqK4MP8jd5oYGX75r crGF4nL4ePNWHFJsp4mC2OlNPqUyCdAyxM1POq/IZJU3miQwI019QhQx02pdTkPTaTAUm p6ddatJgarKI1GVVJSmzaTEuJJI/vSUO8FEkU84PhouRU4e1Lp+dWxVis0Dq0/meek/UX cQOK0x6+BUQAq025rHa0cSM+QvmLaRQ14Se+tfAXGhIpYrRShTm2ondpC+on7y8fPdDjL UevC4fgOVyZ1zjIIz5m02YS9XYx3ege7gE2WJaqF18/o6xfBEBY4Fd8IJxcsdfs/PWw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=KznIe6z4; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9C5AA606A33A for ; Sat, 7 Nov 2026 11:07:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=KznIe6z4 Received: by smtp.kernel.org (Postfix) with ESMTPSA id 03BAC1F008A4; Sat, 7 Nov 2026 11:07:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794049678; bh=D2tOQJKEo6HGVh7kZUmIps9cczDldjJxxQtVmDexUcs=; h=From:To:Cc:Subject:Date; b=KznIe6z4E/UCSRUjBJ/ir4qXFx+LSq1EdSHnE7MajB7UjgoIMrhODKW213r1rnqrO YO6SasKgJQ45yP+nB7tQTf+PsOtMw8C300qXBxxQpw0WI372vKv+YNpvr6Upr1Vnop grjozgRP0yT5f4f9wxGWAXhbDcVfYogo5l2Z3E3746FG43gYX7DEke6U+GIUOdyF+/ KXRlNpZ/Z5TIkOGqIzUyi/9iUT46cNauqgA7xAGAbIIX8QZQezABBILpCQDfH2iUFD zpCqk0qtS25QJurT44LXUQsOW+sNerxBOH0KyuS61bWYth9h8PCrzllAo+ONyZkv5Z +oQ6WHu9IkawQ== From: Sasha Levin To: pabeni@redhat.com, matttbe@kernel.org, kuba@kernel.org Cc: stable@vger.kernel.org Subject: FAILED: patch "[PATCH] mptcp: fix subflow bitfield misuse" failed to apply to 5.15-stable tree Date: Sat, 7 Nov 2026 06:07:56 -0500 Message-ID: <20261107060756-failed-5.15-7538fa33bb2f@kernel.org> X-Mailer: git-send-email 2.53.0 X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x 7538fa33bb2f66b8b809ff39d58308be48e197a0 # git commit -s git send-email --to '' --in-reply-to '20261107060756-failed-5.15-7538fa33bb2f@kernel.org' --subject-prefix 'PATCH 5.15.y' 'HEAD^..' Thanks, Sasha ------------------ original commit in Linus's tree ------------------ >From 7538fa33bb2f66b8b809ff39d58308be48e197a0 Mon Sep 17 00:00:00 2001 From: Paolo Abeni Date: Tue, 13 Oct 2026 16:29:20 +0200 Subject: [PATCH] mptcp: fix subflow bitfield misuse The subflow status bitfield is protected by the subflow socket lock, with one notable exception: the `close_event_done` bit is actually under the msk socket lock protection. As reported by Clashiko [1], flipping the latter bit may corrupt other entries in the same bitfield. Move the `close_event_done` outside the bitfield, in a 32bit hole. Link: https://lore.kernel.org/178959153492.22033.1944011998010756543@kernel.org Fixes: d82809b6c5f2 ("mptcp: avoid duplicated SUB_CLOSED events") Cc: stable@vger.kernel.org Signed-off-by: Paolo Abeni Reviewed-by: Matthieu Baerts (NGI0) Signed-off-by: Matthieu Baerts (NGI0) Link: https://patch.msgid.link/20261013-net-mptcp-misc-fixes-7-3-rc8-v1-2-932c9b182fc7@kernel.org Signed-off-by: Jakub Kicinski --- net/mptcp/protocol.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h index 0384d6a023f9d..c006110b1c56d 100644 --- a/net/mptcp/protocol.h +++ b/net/mptcp/protocol.h @@ -583,14 +583,16 @@ struct mptcp_subflow_context { closing : 1, /* must not pass rx data to msk anymore */ valid_csum_seen : 1, /* at least one csum validated */ is_mptfo : 1, /* subflow is doing TFO */ - close_event_done : 1, /* has done the post-closed part */ mpc_drop : 1, /* the MPC option has been dropped in a rtx */ resetting : 1, /* subflow is resetting */ - __unused : 8; + __unused : 9; bool data_avail; bool scheduled; bool pm_listener; /* a listener managed by the kernel PM? */ bool fully_established; /* path validated */ + bool close_event_done; /* has done the post-closed part, + * protected by msk socket lock + */ u32 lent_mem_frag; u32 remote_nonce; u64 thmac; -- 2.53.0