netdev - Re: [PATCH net] ipv6: release rt6->rt6i

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Date:   Mon, 14 Aug 2017 13:05:16 -0600
From:   David Ahern <dsahern@...il.com>
To:     Wei Wang <weiwan@...gle.com>, David Miller <davem@...emloft.net>,
        netdev@...r.kernel.org
Cc:     Martin KaFai Lau <kafai@...com>
Subject: Re: [PATCH net] ipv6: release rt6->rt6i_idev properly during ifdown

On 8/14/17 11:44 AM, Wei Wang wrote:
> From: Wei Wang <weiwan@...gle.com>
> 
> When a dst is created by addrconf_dst_alloc() for a host route or an
> anycast route, dst->dev points to loopback dev while rt6->rt6i_idev
> points to a real device.
> When the real device goes down, the current cleanup code only checks for
> dst->dev and assumes rt6->rt6i_idev->dev is the same. This causes the
> refcount leak on the real device in the above situation.
> This patch makes sure to always release the refcount taken on
> rt6->rt6i_idev during dst_dev_put().
> 
> Fixes: 587fea741134 ("ipv6: mark DST_NOGC and remove the operation of
> dst_free()")
> Reported-by: John Stultz <john.stultz@...aro.org>
> Tested-by: John Stultz <john.stultz@...aro.org>
> Tested-by: Martin KaFai Lau <kafai@...com>
> Signed-off-by: Wei Wang <weiwan@...gle.com>
> Signed-off-by: Martin KaFai Lau <kafai@...com>
> ---
>  net/ipv6/route.c | 13 +++++--------
>  1 file changed, 5 insertions(+), 8 deletions(-)

Acked-by: David Ahern <dsahern@...il.com>