netdev - Re: [PATCH net v3] sctp: fix dst refcnt leak in sctp_v4_get

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Date:   Tue, 6 Feb 2018 13:06:04 +0800
From:   Xin Long <lucien.xin@...il.com>
To:     David Ahern <dsahern@...il.com>
Cc:     Tommi Rantala <tommi.t.rantala@...ia.com>,
        network dev <netdev@...r.kernel.org>,
        linux-sctp@...r.kernel.org, Neil Horman <nhorman@...driver.com>,
        Alexey Kodanev <alexey.kodanev@...cle.com>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [PATCH net v3] sctp: fix dst refcnt leak in sctp_v4_get_dst

On Tue, Feb 6, 2018 at 7:20 AM, David Ahern <dsahern@...il.com> wrote:
> On 2/5/18 12:48 PM, Tommi Rantala wrote:
>> Fix dst reference count leak in sctp_v4_get_dst() introduced in commit
>> 410f03831 ("sctp: add routing output fallback"):
>>
>> When walking the address_list, successive ip_route_output_key() calls
>> may return the same rt->dst with the reference incremented on each call.
>>
>> The code would not decrement the dst refcount when the dst pointer was
>> identical from the previous iteration, causing the dst refcnt leak.
>>
> ...
>>   ...
>>
>> Fixes: 410f03831 ("sctp: add routing output fallback")
>> Fixes: 0ca50d12f ("sctp: fix src address selection if using secondary addresses")
>
> any syzbot references for this bug?
In Dmitry Vyukov mail, there was no syzbot reference provided.
Not sure if there's another way to tell syzbot.

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