tree b4af661a8bf4a95226164673afd44c4ae985c53c
parent a2e2e0038e4df6e7706d7a524a633e6de8a946f1
author Mat Martineau <martineau@kernel.org> 1744967977 +0200
committer Matthieu Baerts (NGI0) <matttbe@kernel.org> 1745244701 +0200

mptcp: pm: Defer freeing of MPTCP userspace path manager entries

When path manager entries are deleted from the local address list, they
are first unlinked from the address list using list_del_rcu(). The
entries must not be freed until after the RCU grace period, but the
existing code immediately frees the entry.

Use kfree_rcu_mightsleep() and adjust sk_omem_alloc in open code instead
of using the sock_kfree_s() helper. This code path is only called in a
netlink handler, so the "might sleep" function is preferable to adding
a rarely-used rcu_head member to struct mptcp_pm_addr_entry.

Fixes: 88d097316371 ("mptcp: drop free_list for deleting entries")
Signed-off-by: Mat Martineau <martineau@kernel.org>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>