diff options
| author | Guillaume Nault <g.nault@alphalink.fr> | 2018-04-12 21:50:35 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-04-13 19:17:26 +0300 |
| commit | f726214d9b23e5fce8c11937577a289a3202498f (patch) | |
| tree | 7143db7e1e7c2286a02f5f03a19bb0935e24456f /net/l2tp/l2tp_core.c | |
| parent | 0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443 (diff) | |
| download | linux-f726214d9b23e5fce8c11937577a289a3202498f.tar.xz | |
l2tp: hold reference on tunnels printed in l2tp/tunnels debugfs file
Use l2tp_tunnel_get_nth() instead of l2tp_tunnel_find_nth(), to be safe
against concurrent tunnel deletion.
Use the same mechanism as in l2tp_ppp.c for dropping the reference
taken by l2tp_tunnel_get_nth(). That is, drop the reference just
before looking up the next tunnel. In case of error, drop the last
accessed tunnel in l2tp_dfs_seq_stop().
That was the last use of l2tp_tunnel_find_nth().
Fixes: 0ad6614048cf ("l2tp: Add debugfs files for dumping l2tp debug info")
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/l2tp/l2tp_core.c')
| -rw-r--r-- | net/l2tp/l2tp_core.c | 20 |
1 files changed, 0 insertions, 20 deletions
diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c index c8c4183f0f37..40261cb68e83 100644 --- a/net/l2tp/l2tp_core.c +++ b/net/l2tp/l2tp_core.c @@ -355,26 +355,6 @@ err_tlock: } EXPORT_SYMBOL_GPL(l2tp_session_register); -struct l2tp_tunnel *l2tp_tunnel_find_nth(const struct net *net, int nth) -{ - struct l2tp_net *pn = l2tp_pernet(net); - struct l2tp_tunnel *tunnel; - int count = 0; - - rcu_read_lock_bh(); - list_for_each_entry_rcu(tunnel, &pn->l2tp_tunnel_list, list) { - if (++count > nth) { - rcu_read_unlock_bh(); - return tunnel; - } - } - - rcu_read_unlock_bh(); - - return NULL; -} -EXPORT_SYMBOL_GPL(l2tp_tunnel_find_nth); - /***************************************************************************** * Receive data handling *****************************************************************************/ |