[PATCH 1/1] veth: don't free priv->status until dev->destructor (v2)
shemminger at vyatta.com
Wed Aug 5 10:10:05 PDT 2009
On Tue, 04 Aug 2009 23:40:47 -0700
ebiederm at xmission.com (Eric W. Biederman) wrote:
> Stephen Hemminger <shemminger at vyatta.com> writes:
> > On Fri, 26 Jun 2009 11:24:18 -0500
> > "Serge E. Hallyn" <serue at us.ibm.com> wrote:
> >> Based on the commit msg on ae0e8e82205c903978a79ebf5e31c670b61fa5b4, it looks
> >> ether_setup(dev);
> >> @@ -306,7 +320,7 @@ static void veth_setup(struct net_device *dev)
> >> dev->netdev_ops = &veth_netdev_ops;
> >> dev->ethtool_ops = &veth_ethtool_ops;
> >> dev->features |= NETIF_F_LLTX;
> >> - dev->destructor = free_netdev;
> >> + dev->destructor = veth_dev_free;
> > This is still going to oops if sysfs statistics referenced
> > after module unload because module is unloaded (code is gone)
> > and veth_dev_free no longer exists.
> Has anyone actually seen that cause an oops?
> The reason I am asking is that as I read the code we cannot have
> this problem. At worst the destructor callback is delayed until:
> Similarly even if the sysfs filehandle is open we have called:
> Which guarantees that sysfs_get_active_two will fail and all
> subsequent actions on that file will fail.
Sysfs must be safer than it used to be.
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