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l2tp: hold tunnel in pppol2tp_connect()

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Use l2tp_tunnel_get() in pppol2tp_connect() to ensure the tunnel isn't
going to disappear while processing the rest of the function.

Fixes: fd558d186d ("l2tp: Split pppol2tp patch into separate l2tp and ppp parts")
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 2017-10-30 17:58:58 +01:00 committed by David S. Miller
parent 0b07194bb5
commit f9e56baf03
1 changed files with 6 additions and 1 deletions
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7
net/l2tp/l2tp_ppp.c
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@ -584,6 +584,7 @@ static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
u32 tunnel_id, peer_tunnel_id;
u32 session_id, peer_session_id;
bool drop_refcnt = false;
bool drop_tunnel = false;
int ver = 2;
int fd;
@ -652,7 +653,9 @@ static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
if (tunnel_id == 0)
goto end;
tunnel = l2tp_tunnel_find(sock_net(sk), tunnel_id);
tunnel = l2tp_tunnel_get(sock_net(sk), tunnel_id);
if (tunnel)
drop_tunnel = true;
/* Special case: create tunnel context if session_id and
* peer_session_id is 0. Otherwise look up tunnel using supplied
@ -781,6 +784,8 @@ out_no_ppp:
end:
if (drop_refcnt)
l2tp_session_dec_refcount(session);
if (drop_tunnel)
l2tp_tunnel_dec_refcount(tunnel);
release_sock(sk);
return error;