diff options
| author | Guillaume Nault <g.nault@alphalink.fr> | 2020-05-22 00:57:16 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-05-27 16:40:29 +0200 |
| commit | ddda402d21dc991be3d314aba08a015db1475b32 (patch) | |
| tree | 47e02025c0c799d9818685b93aabf30f4aaf4e88 /net | |
| parent | 1d175333f1a0d0fefd248513be5178f330e11e5c (diff) | |
l2tp: hold session while sending creation notifications
commit 5e6a9e5a3554a5b3db09cdc22253af1849c65dff upstream.
l2tp_session_find() doesn't take any reference on the returned session.
Therefore, the session may disappear while sending the notification.
Use l2tp_session_get() instead and decrement session's refcount once
the notification is sent.
Backporting Notes
This is a backport of a backport.
Fixes: 33f72e6f0c67 ("l2tp : multicast notification to the registered listeners")
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Giuliano Procida <gprocida@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
| -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 fb3248ff8b48..43f0af1c4697 100644 --- a/net/l2tp/l2tp_netlink.c +++ b/net/l2tp/l2tp_netlink.c @@ -626,10 +626,12 @@ static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *inf session_id, peer_session_id, &cfg); if (ret >= 0) { - session = l2tp_session_find(net, tunnel, session_id); - if (session) + session = l2tp_session_get(net, tunnel, session_id, false); + if (session) { ret = l2tp_session_notify(&l2tp_nl_family, info, session, L2TP_CMD_SESSION_CREATE); + l2tp_session_dec_refcount(session); + } } out: |