netdev - Re: Use after free in __dst_destroy_metrics

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Date:   Fri, 08 Sep 2017 13:50:02 -0600
From:   Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Lorenzo Colitti <lorenzo@...gle.com>
Subject: Re: Use after free in __dst_destroy_metrics_generic

On 2017-09-08 10:10, Cong Wang wrote:
> On Thu, Sep 7, 2017 at 5:52 PM, Subash Abhinov Kasiviswanathan
> <subashab@...eaurora.org> wrote:
>> We are seeing a possible use after free in ip6_dst_destroy.
>> 
>> It appears as if memory of the __DST_METRICS_PTR(old) was freed in 
>> some path
>> and allocated
>> to ion driver. ion driver has also freed it. Finally the memory is 
>> freed by
>> the
>> fib gc and crashes since it is already deallocated.
> 
> Does the attach (compile-only) patch help anything?
> 
> From my _quick_ glance, it seems we miss the refcnt'ing
> right in __dst_destroy_metrics_generic().
> 
> Thanks!

Hi Cong

Thanks for patch. I'll try this out.

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