mptcp: add validity check for sending RM_ADDR

commit 8df220b29282e8b450ea57be62e1eccd4996837c upstream.

This patch adds the validity check for sending RM_ADDRs for userspace PM
in mptcp_pm_remove_addrs(), only send a RM_ADDR when the address is in the
anno_list or conn_list.

Fixes: 8b1c94da1e48 ("mptcp: only send RM_ADDR in nl_cmd_remove")
Cc: stable@vger.kernel.org
Signed-off-by: Geliang Tang <geliang.tang@suse.com>
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts <matttbe@kernel.org>
Link: https://lore.kernel.org/r/20231114-upstream-net-20231113-mptcp-misc-fixes-6-7-rc2-v1-3-7b9cd6a7b7f4@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index 9661f38..3011bc3 100644 (file)
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -1538,8 +1538,9 @@ void mptcp_pm_remove_addrs(struct mptcp_sock *msk, struct list_head *rm_list)
        struct mptcp_pm_addr_entry *entry;
 
        list_for_each_entry(entry, rm_list, list) {
-               remove_anno_list_by_saddr(msk, &entry->addr);
-               if (alist.nr < MPTCP_RM_IDS_MAX)
+               if ((remove_anno_list_by_saddr(msk, &entry->addr) ||
+                    lookup_subflow_by_saddr(&msk->conn_list, &entry->addr)) &&
+                   alist.nr < MPTCP_RM_IDS_MAX)
                        alist.ids[alist.nr++] = entry->addr.id;
        }