This variable counts how many MPTCP endpoints have a 'fullmesh' flag
set. After having flushed all MPTCP endpoints, it is then needed to
reset this counter.

Without this reset, this counter exposed to the userspace is wrong, but
also non-fullmesh endpoints added after the flush will not be taken into
account to create subflows in reaction to ADD_ADDRs.

Fixes: f88191c7f361 ("mptcp: pm: in-kernel: record fullmesh endp nb")
Cc: stable@vger.kernel.org
Reported-by: Sashiko <sashiko-bot@kernel.org>
Closes: https://sashiko.dev/#/patchset/20260422-mptcp-inc-limits-v6-0-903181771530%40kernel.org?part=15
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
---
 net/mptcp/pm_kernel.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/mptcp/pm_kernel.c b/net/mptcp/pm_kernel.c
index 0ebf43be9939..c9f1e5af3cd3 100644
--- a/net/mptcp/pm_kernel.c
+++ b/net/mptcp/pm_kernel.c
@@ -1278,6 +1278,7 @@ static void __reset_counters(struct pm_nl_pernet *pernet)
 	WRITE_ONCE(pernet->endp_signal_max, 0);
 	WRITE_ONCE(pernet->endp_subflow_max, 0);
 	WRITE_ONCE(pernet->endp_laminar_max, 0);
+	WRITE_ONCE(pernet->endp_fullmesh_max, 0);
 	pernet->endpoints = 0;
 }
 

-- 
2.53.0