linux-kernel - Re: net: heap out-of-bounds in fib6_clean_node/rt6_fill_node/fib6_age/fib6_prune

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Message-ID: <75e4e5bb-7ce9-9317-4aca-8be41a8161d7@cumulusnetworks.com>
Date:   Fri, 21 Apr 2017 12:25:33 -0600
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     Andrey Konovalov <andreyknvl@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Mahesh Bandewar <maheshb@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        David Miller <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        James Morris <jmorris@...ei.org>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Patrick McHardy <kaber@...sh.net>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: net: heap out-of-bounds in
 fib6_clean_node/rt6_fill_node/fib6_age/fib6_prune_clone

On 4/21/17 10:47 AM, Eric Dumazet wrote:
> On Fri, 2017-04-21 at 08:27 -0600, David Ahern wrote:
>> On 4/20/17 10:09 AM, Andrey Konovalov wrote:
>>> On Thu, Apr 20, 2017 at 5:39 PM, Andrey Konovalov <andreyknvl@...gle.com> wrote:
>>>> On Thu, Apr 20, 2017 at 5:35 PM, David Ahern <dsa@...ulusnetworks.com> wrote:
>>>>> On 4/20/17 9:28 AM, Andrey Konovalov wrote:
>>>>>> This one seems to be much closer to what Dmitry reported intially.
>>>>> does not repro here; I ran in a loop and nothing.
>>> Here's strace log, maybe it'll help figuring out why it doesn't reproduce:
>>
>> reproduced. working on it.
> 
> Thanks guys for working on this ;)
> 


Reliable reproducer is the key.

I see what's going on - why the WARN_ON is hit; just looking for the
right fix.