netdev - Re: [PATCH] net: vrf: Reset rt6i_idev in local dst after put

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Message-Id: <20170321.175125.405948588572698532.davem@davemloft.net>
Date:   Tue, 21 Mar 2017 17:51:25 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     dsa@...ulusnetworks.com
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH] net: vrf: Reset rt6i_idev in local dst after put

From: David Ahern <dsa@...ulusnetworks.com>
Date: Fri, 17 Mar 2017 16:07:11 -0700

> The VRF driver takes a reference to the inet6_dev on the VRF device for
> its rt6_local dst when handling local traffic through the VRF device as
> a loopback. When the device is deleted the driver does a put on the idev
> but does not reset rt6i_idev in the rt6_info struct. When the dst is
> destroyed, dst_destroy calls ip6_dst_destroy which does a second put for
> what is essentially the same reference causing it to be prematurely freed.
> Reset rt6i_idev after the put in the vrf driver.
> 
> Fixes: b4869aa2f881e ("net: vrf: ipv6 support for local traffic to
>                        local addresses")
> Signed-off-by: David Ahern <dsa@...ulusnetworks.com>

Applied and queued up for -stable.