netdev - Re: [PATCH] net_namespace: fixed net

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Date:   Thu, 08 Sep 2016 15:16:52 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Jojy Varghese <jojy.varghese@...il.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [PATCH] net_namespace: fixed net_device reference leak

On Thu, 2016-09-08 at 15:12 -0700, Jojy Varghese wrote:
> Hi Eric/Lance
> 
>  Thanks for taking time to look at the patch. The problem in dst.c's
> "dst_ifdown" is that it will never do an actual "dev_put" on the
> loopback net device. This results in the loopback net device to be
> alive even when the dst goes away.

Sure, but the dst themselves should disappear, and thus release their
dst->dev reference.

Something is missing.

loopback device is only used when we remove one device from the system,
but namespace (and loopback device) is still around.