[ 024/187] net: l2tp_eth: fix kernel panic on rmmod l2tp_eth

Greg Kroah-Hartman
2012-07-12T22:37:01Z

From: Eric Dumazet <edumazet@google.com>

[ Upstream commit a06998b88b1651c5f71c0e35f528bf2057188ead ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/l2tp/l2tp_eth.c | 2 ++
1 file changed, 2 insertions(+)

--- a/net/l2tp/l2tp_eth.c
+++ b/net/l2tp/l2tp_eth.c
@@ -167,6 +167,7 @@ static void l2tp_eth_delete(struct l2tp_
if (dev) {
unregister_netdev(dev);
spriv->dev = NULL;
+ module_put(THIS_MODULE);
}
}
}
@@ -254,6 +255,7 @@ static int l2tp_eth_create(struct net *n
if (rc < 0)
goto out_del_dev;

+ __module_get(THIS_MODULE);
/* Must be done after register_netdev() */
strlcpy(session->ifname, dev->name, IFNAMSIZ);