6.6-stable review patch. If anyone has any objections, please let me know.
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From: Matthieu Baerts (NGI0) matttbe@kernel.org
commit ef34a6ea0cab1800f4b3c9c3c2cefd5091e03379 upstream.
If no subflows are attached to the 'subflow' endpoints that are being flushed, the corresponding addr IDs will not be marked as available again.
Mark all ID as being available when flushing all the 'subflow' endpoints, and reset local_addr_used counter to cover these cases.
Note that mptcp_pm_remove_addrs_and_subflows() helper is only called for flushing operations, not to remove a specific set of addresses and subflows.
Fixes: 06faa2271034 ("mptcp: remove multi addresses and subflows in PM") 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/20240819-net-mptcp-pm-reusing-id-v1-5-38035d40de5b@... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/mptcp/pm_netlink.c | 7 +++++++ 1 file changed, 7 insertions(+)
--- a/net/mptcp/pm_netlink.c +++ b/net/mptcp/pm_netlink.c @@ -1654,8 +1654,15 @@ void mptcp_pm_remove_addrs_and_subflows( mptcp_pm_remove_addr(msk, &alist); spin_unlock_bh(&msk->pm.lock); } + if (slist.nr) mptcp_pm_remove_subflow(msk, &slist); + + /* Reset counters: maybe some subflows have been removed before */ + spin_lock_bh(&msk->pm.lock); + bitmap_fill(msk->pm.id_avail_bitmap, MPTCP_PM_MAX_ADDR_ID + 1); + msk->pm.local_addr_used = 0; + spin_unlock_bh(&msk->pm.lock); }
static void mptcp_nl_remove_addrs_list(struct net *net,