From: Geliang Tang tanggeliang@kylinos.cn
When traversing userspace_pm_local_addr_list and deleting an entry from it in mptcp_pm_nl_remove_doit(), msk->pm.lock should be held.
This patch holds this lock before mptcp_userspace_pm_lookup_addr_by_id() and releases it after list_move() in mptcp_pm_nl_remove_doit().
Fixes: d9a4594edabf ("mptcp: netlink: Add MPTCP_PM_CMD_REMOVE") Cc: stable@vger.kernel.org Signed-off-by: Geliang Tang tanggeliang@kylinos.cn Reviewed-by: Matthieu Baerts (NGI0) matttbe@kernel.org Signed-off-by: Matthieu Baerts (NGI0) matttbe@kernel.org --- net/mptcp/pm_userspace.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/net/mptcp/pm_userspace.c b/net/mptcp/pm_userspace.c index 3f888bfe1462ee3c75a3fb6eefe29cb712471410..e35178f5205faac4a9199df1ffca79085e4b7c68 100644 --- a/net/mptcp/pm_userspace.c +++ b/net/mptcp/pm_userspace.c @@ -308,14 +308,17 @@ int mptcp_pm_nl_remove_doit(struct sk_buff *skb, struct genl_info *info)
lock_sock(sk);
+ spin_lock_bh(&msk->pm.lock); match = mptcp_userspace_pm_lookup_addr_by_id(msk, id_val); if (!match) { GENL_SET_ERR_MSG(info, "address with specified id not found"); + spin_unlock_bh(&msk->pm.lock); release_sock(sk); goto out; }
list_move(&match->list, &free_list); + spin_unlock_bh(&msk->pm.lock);
mptcp_pm_remove_addrs(msk, &free_list);