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| author | Guillaume Nault <g.nault@alphalink.fr> | 2017-08-25 16:51:42 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-08-28 11:34:58 -0700 |
| commit | 8c0e421525c9eb50d68e8f633f703ca31680b746 (patch) | |
| tree | 2647c4fa3aeb5b983c65f151ab05405dd37bd3cd /net/l2tp | |
| parent | bb0a32ce4389e17e47e198d2cddaf141561581ad (diff) | |
| download | linux-8c0e421525c9eb50d68e8f633f703ca31680b746.tar.gz linux-8c0e421525c9eb50d68e8f633f703ca31680b746.tar.bz2 linux-8c0e421525c9eb50d68e8f633f703ca31680b746.zip | |
l2tp: hold tunnel while handling genl tunnel updates
We need to make sure the tunnel is not going to be destroyed by
l2tp_tunnel_destruct() concurrently.
Fixes: 309795f4bec2 ("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>
Diffstat (limited to 'net/l2tp')
| -rw-r--r-- | net/l2tp/l2tp_netlink.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/net/l2tp/l2tp_netlink.c b/net/l2tp/l2tp_netlink.c index 808966550620..d61e75b4e619 100644 --- a/net/l2tp/l2tp_netlink.c +++ b/net/l2tp/l2tp_netlink.c @@ -303,8 +303,8 @@ 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; } @@ -315,6 +315,8 @@ 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; } |