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l2tp: hold session while sending creation notifications

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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.

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>
This commit is contained in:
Guillaume Nault 2017-03-31 13:02:29 +02:00 committed by Greg Kroah-Hartman
parent d9face6fc6
commit 599e6f0387
1 changed files with 4 additions and 2 deletions
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6
net/l2tp/l2tp_netlink.c
View File

@ -634,10 +634,12 @@ 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: