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: <328b1fa7-2d97-6ae3-3b87-e33a0d564ad9@cumulusnetworks.com>
Date:   Tue, 7 Mar 2017 11:43:01 -0700
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Eric Dumazet <eric.dumazet@...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>,
        Cong Wang <xiyou.wangcong@...il.com>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: net: heap out-of-bounds in
 fib6_clean_node/rt6_fill_node/fib6_age/fib6_prune_clone

On 3/7/17 11:13 AM, Dmitry Vyukov wrote:
>> on this warning:
>>
>> /* dst.next really should not be set at this point */
>> if (rt->dst.next && rt->dst.next->ops->family != AF_INET6) {
>>         pr_warn("fib6_add: adding rt with bad next -- family %d dst
>> flags %x\n",
>>                 rt->dst.next->ops->family, rt->dst.next->flags);
>>
>>         WARN_ON(1);
>> }
>>
>> You should have seen the pr_warn in the log preceding the WARN_ON dump.
> 
> Right. They all have the same "IPv6: fib6_add: adding rt with bad next
> -- family 2 dst flags 6"

remove the previous changes and try the attached.

View attachment "ipv6-debug.patch" of type "text/plain" (5112 bytes)