lkml.org 
[lkml]   [2012]   [Nov]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[ 52/66] l2tp: fix oops in l2tp_eth_create() error path
Date
3.6-stable review patch.  If anyone has any objections, please let me know.

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


From: Tom Parkin <tparkin@katalix.com>

[ Upstream commit 789336360e0a2aeb9750c16ab704a02cbe035e9e ]

When creating an L2TPv3 Ethernet session, if register_netdev() should fail for
any reason (for example, automatic naming for "l2tpeth%d" interfaces hits the
32k-interface limit), the netdev is freed in the error path. However, the
l2tp_eth_sess structure's dev pointer is left uncleared, and this results in
l2tp_eth_delete() then attempting to unregister the same netdev later in the
session teardown. This results in an oops.

To avoid this, clear the session dev pointer in the error path.

Signed-off-by: Tom Parkin <tparkin@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/l2tp/l2tp_eth.c | 1 +
1 file changed, 1 insertion(+)

--- a/net/l2tp/l2tp_eth.c
+++ b/net/l2tp/l2tp_eth.c
@@ -290,6 +290,7 @@ static int l2tp_eth_create(struct net *n

out_del_dev:
free_netdev(dev);
+ spriv->dev = NULL;
out_del_session:
l2tp_session_delete(session);
out:



\
 
 \ /
  Last update: 2012-11-15 06:23    [W:0.305 / U:0.916 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site