netdev - Re: Use after free in __dst_destroy_metrics

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Date:   Sat, 16 Sep 2017 15:40:08 +0300 (EEST)
From:   Julian Anastasov <ja@....bg>
To:     Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
cc:     Eric Dumazet <eric.dumazet@...il.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Lorenzo Colitti <lorenzo@...gle.com>
Subject: Re: Use after free in __dst_destroy_metrics_generic


	Hello,

On Fri, 15 Sep 2017, Subash Abhinov Kasiviswanathan wrote:

> > 	May be I'm missing some posting but I don't see if
> > the patch was tested successfully.
> > 
> Hi Julian
> 
> I've had this patch being tested for the last 3-4 days in our regression rack
> and I haven't seen the same issue being reproduced or even a related crash
> or leak in dst.

	For now I see only its bug-hiding side effects, i.e.
it does not call kfree. Now if there is no double-free
there should be a leak, not for dst but for metrics.

> The original issue was reported only once to us from the regression rack only
> so the exact steps to reproduce is unknown.

	OK, lets see, may be others can explain what happens.

Regards

--
Julian Anastasov <ja@....bg>