Commit 0f45f24f authored by Guillaume Nault's avatar Guillaume Nault Committed by Khalid Elmously

l2tp: hold tunnel while handling genl tunnel updates

BugLink: https://bugs.launchpad.net/bugs/1883916

commit 8c0e4215 upstream.

We need to make sure the tunnel is not going to be destroyed by
l2tp_tunnel_destruct() concurrently.

Fixes: 309795f4 ("l2tp: Add netlink control API for L2TP")
Signed-off-by: default avatarGuillaume Nault <g.nault@alphalink.fr>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarGiuliano Procida <gprocida@google.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarKamal Mostafa <kamal@canonical.com>
Signed-off-by: default avatarKhalid Elmously <khalid.elmously@canonical.com>
parent 1bb2d448
......@@ -310,8 +310,8 @@ static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info
}
tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
tunnel = l2tp_tunnel_find(net, tunnel_id);
if (tunnel == NULL) {
tunnel = l2tp_tunnel_get(net, tunnel_id);
if (!tunnel) {
ret = -ENODEV;
goto out;
}
......@@ -322,6 +322,8 @@ static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info
ret = l2tp_tunnel_notify(&l2tp_nl_family, info,
tunnel, L2TP_CMD_TUNNEL_MODIFY);
l2tp_tunnel_dec_refcount(tunnel);
out:
return ret;
}
......
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