| From | Greg Kroah-Hartman <> | Subject | [ 52/66] l2tp: fix oops in l2tp_eth_create() error path | Date | Wed, 14 Nov 2012 20:10:57 -0800 |
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3.6-stable review patch. If anyone has any objections, please let me know.
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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:
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