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authorGuillaume Nault <g.nault@alphalink.fr>2017-03-29 08:45:29 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-05-03 08:36:35 -0700
commit3ae0fc950603dcc1716eba1f3a99d6119509c505 (patch)
tree9ebd8ba997223d490ef06cfe5c7ab0dd35fe6452 /net/l2tp
parent59bc404b382967a41250cc01299b0419e61392c0 (diff)
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.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c
index 41d47bfda15c..51c190dc2582 100644
--- a/net/l2tp/l2tp_ppp.c
+++ b/net/l2tp/l2tp_ppp.c
@@ -450,6 +450,10 @@ 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);
@@ -488,9 +492,6 @@ 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