FAILED: patch "[PATCH] mptcp: pm: only set request_bkup flag when sending MP_PRIO" failed to apply to 5.15-stable tree

FAILED: patch "[PATCH] mptcp: pm: only set request_bkup flag when sending MP_PRIO" failed to apply to 5.15-stable tree

[gregkh]

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 <stable@vger.kernel.org>.

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 4258b94831bb7ff28ab80e3c8d94db37db930728
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2024080704-coconut-decorated-b5ae@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:

4258b94831bb ("mptcp: pm: only set request_bkup flag when sending MP_PRIO")
f5360e9b314c ("mptcp: introduce and use mptcp_pm_send_ack()")
892f396c8e68 ("mptcp: netlink: issue MP_PRIO signals from userspace PMs")
a657430260e5 ("mptcp: Acquire the subflow socket lock before modifying MP_PRIO flags")
c21b50d5912b ("mptcp: Avoid acquiring PM lock for subflow priority changes")
702c2f646d42 ("mptcp: netlink: allow userspace-driven subflow establishment")
d9a4594edabf ("mptcp: netlink: Add MPTCP_PM_CMD_REMOVE")
9ab4807c84a4 ("mptcp: netlink: Add MPTCP_PM_CMD_ANNOUNCE")
982f17ba1a25 ("mptcp: netlink: split mptcp_pm_parse_addr into two functions")
8b20137012d9 ("mptcp: read attributes of addr entries managed by userspace PMs")
4638de5aefe5 ("mptcp: handle local addrs announced by userspace PMs")
c682bf536cf4 ("mptcp: add pm_nl_pernet helpers")
0e203c324752 ("mptcp: reset the packet scheduler on PRIO change")
4cf86ae84c71 ("mptcp: strict local address ID selection")
d045b9eb95a9 ("mptcp: introduce implicit endpoints")
90d930882139 ("mptcp: constify a bunch of of helpers")
33397b83eee6 ("selftests: mptcp: add backup with port testcase")
09f12c3ab7a5 ("mptcp: allow to use port and non-signal in set_flags")
6a0653b96f5d ("selftests: mptcp: add fullmesh setting tests")
73c762c1f07d ("mptcp: set fullmesh flag in pm_netlink")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 4258b94831bb7ff28ab80e3c8d94db37db930728 Mon Sep 17 00:00:00 2001
From: "Matthieu Baerts (NGI0)" <matttbe@kernel.org>
Date: Sat, 27 Jul 2024 12:01:25 +0200
Subject: [PATCH] mptcp: pm: only set request_bkup flag when sending MP_PRIO

The 'backup' flag from mptcp_subflow_context structure is supposed to be
set only when the other peer flagged a subflow as backup, not the
opposite.

Fixes: 067065422fcd ("mptcp: add the outgoing MP_PRIO support")
Cc: stable@vger.kernel.org
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index f65831de5c1a..7635fac91539 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -471,7 +471,6 @@ static void __mptcp_pm_send_ack(struct mptcp_sock *msk, struct mptcp_subflow_con
 	slow = lock_sock_fast(ssk);
 	if (prio) {
 		subflow->send_mp_prio = 1;
-		subflow->backup = backup;
 		subflow->request_bkup = backup;
 	}
 

[PATCH 5.15.y] mptcp: pm: only set request_bkup flag when sending MP_PRIO

[Matthieu Baerts (NGI0)]

commit 4258b94831bb7ff28ab80e3c8d94db37db930728 upstream.

The 'backup' flag from mptcp_subflow_context structure is supposed to be
set only when the other peer flagged a subflow as backup, not the
opposite.

Fixes: 067065422fcd ("mptcp: add the outgoing MP_PRIO support")
Cc: stable@vger.kernel.org
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
[ Conflicts in pm_netlink.c, because the commit f5360e9b314c ("mptcp:
  introduce and use mptcp_pm_send_ack()") is not in this version. This
  code is in mptcp_pm_nl_mp_prio_send_ack() instead of in a dedicated
  helper. The same modification can be applied there. ]
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
---
 net/mptcp/pm_netlink.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index 1d64c9fed39e..67ece399ef60 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -699,7 +699,6 @@ int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk,
 
 		if (subflow->backup != bkup)
 			msk->last_snd = NULL;
-		subflow->backup = bkup;
 		subflow->send_mp_prio = 1;
 		subflow->request_bkup = bkup;
 		__MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPPRIOTX);
-- 
2.45.2