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

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Date:	Thu, 16 Jan 2014 17:13:03 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
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

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 16 Jan 2014 16:41:19 -0800

> This patch :
> 
> 1) Remove a dst leak if DST_NOCACHE was set on dst
>    Fix this by holding a reference only if dst really cached.

Can you explain this problem a little bit more?

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?

Thanks.
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