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l2tp: hold tunnel while handling genl tunnel updates 

commit 8c0e421525c9eb50d68e8f633f703ca31680b746 upstream.

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

Fixes: 309795f4be ("l2tp: Add netlink control API for L2TP")
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
This commit is contained in:
Guillaume Nault 2017-08-25 16:51:42 +02:00 committed by syphyr
parent 41a6bc7e18
commit 5902818298
1 changed files with 4 additions and 2 deletions
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6
net/l2tp/l2tp_netlink.c
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@ -229,8 +229,8 @@ 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;
}
@ -238,6 +238,8 @@ static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info
if (info->attrs[L2TP_ATTR_DEBUG])
tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
l2tp_tunnel_dec_refcount(tunnel);
out:
return ret;
}