Commit 03f324f3f1f7 for kernel

commit 03f324f3f1f7619a47b9c91282cb12775ab0a2f1
Author: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Date:   Tue May 5 17:00:50 2026 +0200

    mptcp: pm: ADD_ADDR rtx: allow ID 0

    ADD_ADDR can be sent for the ID 0, which corresponds to the local
    address and port linked to the initial subflow.

    Indeed, this address could be removed, and re-added later on, e.g. what
    is done in the "delete re-add signal" MPTCP Join selftests. So no reason
    to ignore it.

    Fixes: 00cfd77b9063 ("mptcp: retransmit ADD_ADDR when timeout")
    Cc: stable@vger.kernel.org
    Reviewed-by: Mat Martineau <martineau@kernel.org>
    Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
    Link: https://patch.msgid.link/20260505-net-mptcp-pm-fixes-7-1-rc3-v1-2-fca8091060a4@kernel.org
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/mptcp/pm.c b/net/mptcp/pm.c
index 57a456690406..5056eb8db24e 100644
--- a/net/mptcp/pm.c
+++ b/net/mptcp/pm.c
@@ -337,9 +337,6 @@ static void mptcp_pm_add_timer(struct timer_list *timer)
 	if (inet_sk_state_load(sk) == TCP_CLOSE)
 		return;

-	if (!entry->addr.id)
-		return;
-
 	if (mptcp_pm_should_add_signal_addr(msk)) {
 		sk_reset_timer(sk, timer, jiffies + TCP_RTO_MAX / 8);
 		goto out;