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l2tp: fix missing refcount drop in pppol2tp_tunnel_ioctl()

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If 'session' is not NULL and is not a PPP pseudo-wire, then we fail to
drop the reference taken by l2tp_session_get().

Fixes: ecd012e45a ("l2tp: filter out non-PPP sessions in pppol2tp_tunnel_ioctl()")
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Guillaume Nault 2018-08-03 17:00:11 +02:00 committed by David S. Miller
parent 60a01828f3
commit f664e37dcc
1 changed files with 10 additions and 5 deletions
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15
net/l2tp/l2tp_ppp.c
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@ -1201,13 +1201,18 @@ static int pppol2tp_tunnel_ioctl(struct l2tp_tunnel *tunnel,
l2tp_session_get(sock_net(sk), tunnel,
stats.session_id);
if (session && session->pwtype == L2TP_PWTYPE_PPP) {
err = pppol2tp_session_ioctl(session, cmd,
arg);
l2tp_session_dec_refcount(session);
} else {
if (!session) {
err = -EBADR;
break;
}
if (session->pwtype != L2TP_PWTYPE_PPP) {
l2tp_session_dec_refcount(session);
err = -EBADR;
break;
}
err = pppol2tp_session_ioctl(session, cmd, arg);
l2tp_session_dec_refcount(session);
break;
}
#ifdef CONFIG_XFRM