netdev - Re: [PATCH net 3/3] ipv6: Fix dst_entry refcnt bugs in ip6

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Message-ID: <20150901205505.GA66075@kafai-mba.local>
Date:	Tue, 1 Sep 2015 13:55:05 -0700
From:	Martin KaFai Lau <kafai@...com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	netdev <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Kernel Team <kernel-team@...com>
Subject: Re: [PATCH net 3/3] ipv6: Fix dst_entry refcnt bugs in ip6_tunnel

On Tue, Sep 01, 2015 at 01:14:20PM -0700, Eric Dumazet wrote:
> It should not be a problem. refcnt is taken when/if necessary (skb
> queued on a qdisc for example)
>
> We have other uses of skb_dst_set_noref()
>
> Please describe the problem ?
The current ip6_tnl_dst_get() does not take the dst refcnt.

If the dst is released after ip6_tnl_dst_get() and before
skb_dst_set_noref(), would it cause an issue?
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