From: Matthieu Baerts (NGI0) Date: Tue, 8 Oct 2024 11:04:55 +0000 (+0200) Subject: mptcp: pm: do not remove closing subflows X-Git-Tag: v5.15.168~15 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cda875cd150672edc5d2cdae9a0cd825e008e77e;p=thirdparty%2Fkernel%2Fstable.git mptcp: pm: do not remove closing subflows commit db0a37b7ac27d8ca27d3dc676a16d081c16ec7b9 upstream. In a previous fix, the in-kernel path-manager has been modified not to retrigger the removal of a subflow if it was already closed, e.g. when the initial subflow is removed, but kept in the subflows list. To be complete, this fix should also skip the subflows that are in any closing state: mptcp_close_ssk() will initiate the closure, but the switch to the TCP_CLOSE state depends on the other peer. Fixes: 58e1b66b4e4b ("mptcp: pm: do not remove already closed subflows") Cc: stable@vger.kernel.org Suggested-by: Paolo Abeni Acked-by: Paolo Abeni Signed-off-by: Matthieu Baerts (NGI0) Link: https://patch.msgid.link/20241008-net-mptcp-fallback-fixes-v1-4-c6fb8e93e551@kernel.org Signed-off-by: Jakub Kicinski Signed-off-by: Greg Kroah-Hartman --- diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c index c762e3db5ae48..e524171291bc7 100644 --- a/net/mptcp/pm_netlink.c +++ b/net/mptcp/pm_netlink.c @@ -778,7 +778,8 @@ static void mptcp_pm_nl_rm_addr_or_subflow(struct mptcp_sock *msk, int how = RCV_SHUTDOWN | SEND_SHUTDOWN; u8 id = subflow->local_id; - if (inet_sk_state_load(ssk) == TCP_CLOSE) + if ((1 << inet_sk_state_load(ssk)) & + (TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2 | TCPF_CLOSING | TCPF_CLOSE)) continue; if (rm_type == MPTCP_MIB_RMADDR)