netdev - Re: [PATCH net-next] net loopback: Set loopback

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Message-ID: <87k3igcizo.fsf@xmission.com>
Date:	Mon, 16 Sep 2013 18:52:27 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, edumazet@...gle.com,
	jiri@...nulli.us, alexander.h.duyck@...el.com, amwang@...hat.com,
	netdev@...r.kernel.org, fruggeri@...stanetworks.com
Subject: Re: [PATCH net-next] net loopback: Set loopback_dev to NULL when freed

Eric Dumazet <eric.dumazet@...il.com> writes:

> On Mon, 2013-09-16 at 21:34 -0400, David Miller wrote:
>> From: Eric Dumazet <eric.dumazet@...il.com>
>> Date: Mon, 16 Sep 2013 17:50:51 -0700
>> 
>> > On Mon, 2013-09-16 at 16:52 -0700, Eric W. Biederman wrote:
>> >> It has recently turned up that we have a number of long standing bugs
>> >> in the network stack cleanup code with use of the loopback device
>> >> after it has been freed that have not turned up because in most cases
>> >> the storage allocated to the loopback device is not reused, when those
>> >> accesses happen.
>> >> 
>> >> Set looback_dev to NULL to trigger oopses instead of silent data corrupt
>> >> when we hit this class of bug.
>> >> 
>> >> Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
>> >> ---
>> > 
>> > Acked-by: Eric Dumazet <edumazet@...gle.com>
>> 
>> I'd like to apply this to 'net', any objections?
>
> No objections from me.

No objects from me I just hadn't seen it as a bug fix, but I guess it
sort of is.

Eric

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