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l2tp: fix oops in l2tp_eth_create() error path

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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>
This commit is contained in:
Tom Parkin 2012-10-29 23:41:48 +00:00 committed by David S. Miller
parent e3c9851278
commit 789336360e
1 changed files with 1 additions and 0 deletions
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net/l2tp/l2tp_eth.c
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@ -291,6 +291,7 @@ static int l2tp_eth_create(struct net *net, u32 tunnel_id, u32 session_id, u32 p
out_del_dev:
free_netdev(dev);
spriv->dev = NULL;
out_del_session:
l2tp_session_delete(session);
out: