net: l2tp_eth: fix kernel panic on rmmod l2tp_eth
We must prevent module unloading if some devices are still attached to l2tp_eth driver. Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: Denys Fedoryshchenko <denys@visp.net.lb> Tested-by: Denys Fedoryshchenko <denys@visp.net.lb> Cc: James Chapman <jchapman@katalix.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -162,6 +162,7 @@ static void l2tp_eth_delete(struct l2tp_session *session)
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if (dev) {
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unregister_netdev(dev);
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spriv->dev = NULL;
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module_put(THIS_MODULE);
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}
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}
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}
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@ -249,6 +250,7 @@ static int l2tp_eth_create(struct net *net, u32 tunnel_id, u32 session_id, u32 p
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if (rc < 0)
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goto out_del_dev;
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__module_get(THIS_MODULE);
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/* Must be done after register_netdev() */
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strlcpy(session->ifname, dev->name, IFNAMSIZ);
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