Patch "mptcp: fix bad accounting in __mptcp_subflow_push_pending()" has been added to the 6.12-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    mptcp: fix bad accounting in __mptcp_subflow_push_pending()

to the 6.12-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mptcp-fix-bad-accounting-in-__mptcp_subflow_push_pending.patch
and it can be found in the queue-6.12 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


From stable+bounces-338602-greg=kroah.com@vger.kernel.org Sat Sep 19 21:57:31 2026
From: "Matthieu Baerts (NGI0)" <matttbe@kernel.org>
Date: Sat, 19 Sep 2026 21:56:48 +0200
Subject: mptcp: fix bad accounting in __mptcp_subflow_push_pending()
To: mptcp@lists.linux.dev, stable@vger.kernel.org, gregkh@linuxfoundation.org
Cc: Paolo Abeni <pabeni@redhat.com>, sashal@kernel.org, "Matthieu Baerts (NGI0)" <matttbe@kernel.org>, Jakub Kicinski <kuba@kernel.org>
Message-ID: <20260919195642.1977885-12-matttbe@kernel.org>

From: Paolo Abeni <pabeni@redhat.com>

commit f3ef03357396d4b147d8e76c75fb612c2f264ffc upstream.

If __subflow_push_pending() errors out we should avoid updating the
copied byte counters, to avoid mismatch push call later on.

Fixes: 0fa1b3783a17 ("mptcp: use get_send wrapper")
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20260917-net-mptcp-misc-fixes-7-3-rc4-v2-3-0cf5c72667c8@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/mptcp/protocol.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -1757,7 +1757,8 @@ static void __mptcp_subflow_push_pending
 			ret = __subflow_push_pending(sk, ssk, &info);
 			if (ret <= 0)
 				keep_pushing = false;
-			copied += ret;
+			else
+				copied += ret;
 		}
 
 		mptcp_for_each_subflow(msk, subflow) {


Patches currently in stable-queue which might be from matttbe@kernel.org are

queue-6.12/mptcp-annotate-data-races-around-subflow-fully_established.patch
queue-6.12/selftests-mptcp-fix-an-uaf-in-mptcp_connect.c.patch
queue-6.12/mptcp-fix-bad-accounting-in-__mptcp_subflow_push_pending.patch
queue-6.12/mptcp-syncookies-remember-the-request-backup-flag.patch
queue-6.12/mptcp-remove-unneeded-read_once-annotation.patch
queue-6.12/mptcp-close-race-between-scheduler-and-state-change.patch
queue-6.12/tcp-use-gfp_atomic-in-tcp_send_active_reset.patch
queue-6.12/mptcp-avoid-unneeded-actions-on-subflow-reset.patch
queue-6.12/mptcp-options-handle-mpc-data-csum-reqd-no-csum.patch
queue-6.12/mptcp-subflow-no-need-to-copy-thmac-during-ulp_clone.patch