netdev - Re: [PATCH net-next] ipv4: fix a dst leak in tunnels

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Message-ID: <1389922350.31367.447.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Thu, 16 Jan 2014 17:32:30 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, therbert@...gle.com, maze@...gle.com,
	cwang@...pensource.com
Subject: Re: [PATCH net-next] ipv4: fix a dst leak in tunnels

On Thu, 2014-01-16 at 17:13 -0800, David Miller wrote:

> Why do we have to handle DST_NOCACHE specially?  We hold a reference
> and dst_release() knows what to do with DST_NOCACHE routes.
> 
> Or is it semantically undesirable for tunnels to cache these routes?
> If so, why do we leave sockets caching DST_NOCACHE routes just fine?

If DST_NOCACHE is set on a dst, this dst cannot be used by rcu users,
because dst_release() will immediately free the dst, without rcu grace
period.




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