| Message ID | 20200724153157.9366-10-tparkin@katalix.com |
|---|---|
| State | Accepted |
| Delegated to: | David Miller |
| Headers | show |
| Series | l2tp: avoid multiple assignment, remove BUG_ON | expand |
diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c index 50548c61b91e..e723828e458b 100644 --- a/net/l2tp/l2tp_core.c +++ b/net/l2tp/l2tp_core.c @@ -1564,10 +1564,12 @@ void l2tp_session_free(struct l2tp_session *session) struct l2tp_tunnel *tunnel = session->tunnel; if (tunnel) { - BUG_ON(tunnel->magic != L2TP_TUNNEL_MAGIC); + if (WARN_ON(tunnel->magic != L2TP_TUNNEL_MAGIC)) + goto out; l2tp_tunnel_dec_refcount(tunnel); } +out: kfree(session); } EXPORT_SYMBOL_GPL(l2tp_session_free);
l2tp_session_free called BUG_ON if the tunnel magic feather value wasn't correct. The intent of this was to catch lifetime bugs; for example early tunnel free due to incorrect use of reference counts. Since the tunnel magic feather being wrong indicates either early free or structure corruption, we can avoid doing more damage by simply leaving the tunnel structure alone. If the tunnel refcount isn't dropped when it should be, the tunnel instance will remain in the kernel, resulting in the tunnel structure and socket leaking. Signed-off-by: Tom Parkin <tparkin@katalix.com> --- net/l2tp/l2tp_core.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)