diff options
| author | Guillaume Nault <g.nault@alphalink.fr> | 2017-03-29 09:45:29 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-05-08 08:44:08 +0300 |
| commit | 1a016806ae83130bdcb29b340075b932ec4c947d (patch) | |
| tree | a305022c2f026f9499bf87d9ab9db7477a5984bd /net/l2tp | |
| parent | 95cb506b4ad35cf8f8959de190a71b56ebb9b1d5 (diff) | |
| download | linux-1a016806ae83130bdcb29b340075b932ec4c947d.tar.xz | |
l2tp: purge socket queues in the .destruct() callback
[ Upstream commit e91793bb615cf6cdd59c0b6749fe173687bb0947 ]
The Rx path may grab the socket right before pppol2tp_release(), but
nothing guarantees that it will enqueue packets before
skb_queue_purge(). Therefore, the socket can be destroyed without its
queues fully purged.
Fix this by purging queues in pppol2tp_session_destruct() where we're
guaranteed nothing is still referencing the socket.
Fixes: 9e9cb6221aa7 ("l2tp: fix userspace reception on plain L2TP sockets")
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/l2tp')
| -rw-r--r-- | net/l2tp/l2tp_ppp.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c index b704a9356208..5a234fbe2fec 100644 --- a/net/l2tp/l2tp_ppp.c +++ b/net/l2tp/l2tp_ppp.c @@ -469,6 +469,10 @@ static void pppol2tp_session_close(struct l2tp_session *session) static void pppol2tp_session_destruct(struct sock *sk) { struct l2tp_session *session = sk->sk_user_data; + + skb_queue_purge(&sk->sk_receive_queue); + skb_queue_purge(&sk->sk_write_queue); + if (session) { sk->sk_user_data = NULL; BUG_ON(session->magic != L2TP_SESSION_MAGIC); @@ -507,9 +511,6 @@ static int pppol2tp_release(struct socket *sock) l2tp_session_queue_purge(session); sock_put(sk); } - skb_queue_purge(&sk->sk_receive_queue); - skb_queue_purge(&sk->sk_write_queue); - release_sock(sk); /* This will delete the session context via |