linux-kernel - [PATCH 3.16 141/366] l2tp: clean up stale tunnel or session in pppol2tp

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Date:   Sun, 11 Nov 2018 19:49:05 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Guillaume Nault" <g.nault@...halink.fr>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.16 141/366] l2tp: clean up stale tunnel or session in
 pppol2tp_connect's error path

3.16.61-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Guillaume Nault <g.nault@...halink.fr>

commit bda06be2158c7aa7e41b15500c4d3840369c19a6 upstream.

pppol2tp_connect() may create a tunnel or a session. Remove them in
case of error.

Fixes: fd558d186df2 ("l2tp: Split pppol2tp patch into separate l2tp and ppp parts")
Signed-off-by: Guillaume Nault <g.nault@...halink.fr>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/l2tp/l2tp_ppp.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

--- a/net/l2tp/l2tp_ppp.c
+++ b/net/l2tp/l2tp_ppp.c
@@ -634,6 +634,8 @@ static int pppol2tp_connect(struct socke
 	u32 session_id, peer_session_id;
 	bool drop_refcnt = false;
 	bool drop_tunnel = false;
+	bool new_session = false;
+	bool new_tunnel = false;
 	int ver = 2;
 	int fd;
 
@@ -744,6 +746,7 @@ static int pppol2tp_connect(struct socke
 				goto end;
 			}
 			drop_tunnel = true;
+			new_tunnel = true;
 		}
 	} else {
 		/* Error if we can't find the tunnel */
@@ -817,6 +820,7 @@ static int pppol2tp_connect(struct socke
 			goto end;
 		}
 		drop_refcnt = true;
+		new_session = true;
 	}
 
 	/* Special case: if source & dest session_id == 0x0000, this
@@ -863,6 +867,12 @@ out_no_ppp:
 		  session->name);
 
 end:
+	if (error) {
+		if (new_session)
+			l2tp_session_delete(session);
+		if (new_tunnel)
+			l2tp_tunnel_delete(tunnel);
+	}
 	if (drop_refcnt)
 		l2tp_session_dec_refcount(session);
 	if (drop_tunnel)