netdev - Re: [PATCH net] tunnel: support propagating lower device state

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Message-ID: <CAHA+R7OTFAc=1D=WRxLNuqScBJ+wD-wc-qxtNaFxSji_kRi1PA@mail.gmail.com>
Date:	Tue, 30 Dec 2014 12:33:41 -0800
From:	Cong Wang <cwang@...pensource.com>
To:	Stephen Hemminger <shemming@...cade.com>
Cc:	David Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net] tunnel: support propagating lower device state

On Sat, Dec 27, 2014 at 9:59 AM, Stephen Hemminger <shemming@...cade.com> wrote:
> @@ -982,8 +1045,17 @@ int ip_tunnel_init_net(struct net *net,
>         for (i = 0; i < IP_TNL_HASH_SIZE; i++)
>                 INIT_HLIST_HEAD(&itn->tunnels[i]);
>
> +       itn->lower_dev = kcalloc(NETDEV_HASHENTRIES, sizeof(struct hlist_head),
> +                                GFP_KERNEL);
> +       if (!itn->lower_dev) {
> +               kfree(itn->tunnels);
> +               return -ENOMEM;
> +       }
> +
>         if (!ops) {
>                 itn->fb_tunnel_dev = NULL;
> +               kfree(itn->tunnels);
> +               kfree(itn->lower_dev);
>                 return 0;
>         }
>
> @@ -1003,7 +1075,12 @@ int ip_tunnel_init_net(struct net *net,
>         }
>         rtnl_unlock();
>
> -       return PTR_ERR_OR_ZERO(itn->fb_tunnel_dev);
> +       if (IS_ERR(itn->fb_tunnel_dev)) {
> +               kfree(itn->tunnels);
> +               return PTR_ERR(itn->fb_tunnel_dev);
> +       }
> +       return 0;
> +
>  }

Are you sure we really need to free itn->tunnels on
failure path? It is not allocated inside ip_tunnel_init_net()
anyway.
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