From nobody Fri Sep 25 10:03:25 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 55A88388E58; Sun, 20 Sep 2026 07:40:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789890033; cv=none; b=SRG/HTNPVNcIkJeQDHMEMypiqPY31z8ldA81zo3MKjbmTnV6d2/t8C45V/ds5PXQBcMmSEO+5q2UcQzV2lqJG7hpbsr3T//MQm7pmwx3tlFoP8fkzAudp3j7bmJm9Rd1Z510EdrYODJMD4jE4pzxcKrmaNTK5mXPSiaMXeGWgPk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789890033; c=relaxed/simple; bh=lc636GMVOBllB6O8K27e2FHoad8mbQzFCf9o5BtY+lU=; h=Subject:To:Cc:From:Date:In-Reply-To:Message-ID:MIME-Version: Content-Type; b=jI2xfjjeVZOAYrahjjObEj+T+YBSzqbUHHFJXZlAoJbtEluQ4ynHq1kN4tz5jBaVnGOoJX1Y446OrOrxZj8xEyzULCxrk7ymAYwpRkWKy9rrdoiTciT7htDJ+XcY2l/I2St378CIq8t+22Pyd4JgaspYv4I4Jb/gUFVuqzevwXE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=NCXLZPlN; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="NCXLZPlN" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4D7741F000FF; Sun, 20 Sep 2026 07:40:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789890031; bh=Lpnws3nB74PmaZnDEBqU6Xxtkz5+DimFftdTc/GCQLs=; h=Subject:To:Cc:From:Date:In-Reply-To; b=NCXLZPlNmP9k1yGDs0vcFwy0DuUDEBFt32AlMbxKkyFzgttiPv5olQ1FDhvxxEQ9o nHt/opF8860BkUZLGqfqpuLGm+snCzCYHtSED16vtxwPAELmUuhObb7eVjigNUFcyd y3BPAJ4LsAHNTo52OmNkCAbP+SvQ8o1gVgYt6ENc= Subject: Patch "mptcp: close race between scheduler and state change" has been added to the 7.2-stable tree To: gregkh@linuxfoundation.org,kuba@kernel.org,matttbe@kernel.org,mptcp@lists.linux.dev,pabeni@redhat.com,sashal@kernel.org,shardul.b@mpiricsoftware.com,xinyang@anthropic.com Cc: From: Date: Sun, 20 Sep 2026 09:36:40 +0200 In-Reply-To: <20260919193541.1915297-9-matttbe@kernel.org> Message-ID: <2026092040-upriver-wasabi-e76c@gregkh> Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-stable: commit X-Patchwork-Hint: ignore Content-Type: text/plain; charset="utf-8" This is a note to let you know that I've just added the patch titled mptcp: close race between scheduler and state change to the 7.2-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-close-race-between-scheduler-and-state-change.patch and it can be found in the queue-7.2 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. From stable+bounces-338590-greg=3Dkroah.com@vger.kernel.org Sat Sep 19 21:3= 6:25 2026 From: "Matthieu Baerts (NGI0)" Date: Sat, 19 Sep 2026 21:35:45 +0200 Subject: mptcp: close race between scheduler and state change To: mptcp@lists.linux.dev, stable@vger.kernel.org, gregkh@linuxfoundation.o= rg Cc: Paolo Abeni , sashal@kernel.org, Shardul Bankar , Xinyang Ge , "Matthieu B= aerts (NGI0)" , Jakub Kicinski Message-ID: <20260919193541.1915297-9-matttbe@kernel.org> From: Paolo Abeni commit 42064de57fb83231fcc89663a94885f228a1ee53 upstream. The mptcp scheduler may race with subflow sockets state change: data transmission on the selected socket may fail and a later release could try to use mss_now reset to 0 for a divide operation. Address the issue by explicitly checking for the critical scenario. Fixes: c886d70286bf ("mptcp: do not queue data on closed subflows") Cc: stable@vger.kernel.org Reported-by: Shardul Bankar Reported-by: Xinyang Ge Closes: https://lore.kernel.org/20260525194828.1137119-1-shardul.b@mpiricso= ftware.com Signed-off-by: Paolo Abeni Reviewed-by: Matthieu Baerts (NGI0) Signed-off-by: Matthieu Baerts (NGI0) Link: https://patch.msgid.link/20260917-net-mptcp-misc-fixes-7-3-rc4-v2-2-0= cf5c72667c8@kernel.org Signed-off-by: Jakub Kicinski Signed-off-by: Matthieu Baerts (NGI0) Signed-off-by: Greg Kroah-Hartman --- net/mptcp/protocol.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -1588,7 +1588,9 @@ struct sock *mptcp_subflow_get_send(stru =20 static void mptcp_push_release(struct sock *ssk, struct mptcp_sendmsg_info= *info) { - tcp_push(ssk, 0, info->mss_now, tcp_sk(ssk)->nonagle, info->size_goal); + if (info->mss_now) + tcp_push(ssk, 0, info->mss_now, tcp_sk(ssk)->nonagle, + info->size_goal); release_sock(ssk); } =20 Patches currently in stable-queue which might be from matttbe@kernel.org are queue-7.2/selftests-mptcp-fix-an-uaf-in-mptcp_connect.c.patch queue-7.2/mptcp-fix-bad-accounting-in-__mptcp_subflow_push_pending.patch queue-7.2/mptcp-pm-reset-retrans_time-when-add_addr-entry-is-reused.patch queue-7.2/mptcp-syncookies-remember-the-request-backup-flag.patch queue-7.2/mptcp-remove-unneeded-read_once-annotation.patch queue-7.2/mptcp-options-fix-uninit-value-in-mptcp_write_data_fin.patch queue-7.2/mptcp-pm-kernel-drop-pending-add_addr-when-removing-id0.patch queue-7.2/mptcp-close-race-between-scheduler-and-state-change.patch queue-7.2/selftests-mptcp-lib-get-counters-for-the-right-test.patch queue-7.2/tcp-use-gfp_atomic-in-tcp_send_active_reset.patch queue-7.2/mptcp-do-not-reschedule-the-rtx-timer-for-fallback-sockets.patch queue-7.2/mptcp-pm-userspace-fix-address-id-overflow.patch queue-7.2/mptcp-move-the-stale-logic-out-of-retrans-scheduler.patch queue-7.2/mptcp-avoid-unneeded-actions-on-subflow-reset.patch queue-7.2/selftests-mptcp-lib-dump-nstat-for-the-right-test.patch queue-7.2/mptcp-options-handle-mpc-data-csum-reqd-no-csum.patch queue-7.2/mptcp-prevent-race-between-disconnect-and-rtx.patch queue-7.2/mptcp-subflow-no-need-to-copy-thmac-during-ulp_clone.patch