netdev - Re: [PATCH net] sctp: hold the transport before using it in sctp_hash

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Message-ID: <CADvbK_f8EUUCQcF67jer7fgH=7dS=hm7dpbyckxmv0UWiPZgAQ@mail.gmail.com>
Date:   Thu, 8 Sep 2016 21:17:26 +0800
From:   Xin Long <lucien.xin@...il.com>
To:     David Laight <David.Laight@...lab.com>
Cc:     network dev <netdev@...r.kernel.org>,
        "linux-sctp@...r.kernel.org" <linux-sctp@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Vlad Yasevich <vyasevich@...il.com>,
        "daniel@...earbox.net" <daniel@...earbox.net>
Subject: Re: [PATCH net] sctp: hold the transport before using it in sctp_hash_cmp

>> Now sctp uses the transport without holding it in sctp_hash_cmp,
>> it can cause a use-after-free panic. As after it get transport from
>> hashtable, another CPU may free it, then the members it accesses
>> may be unavailable memory.
>
> How old is this bug?
I think since:
$ git describe 33c1529
v4.4-rc7-1158-g33c1529

> Is it in any release kernels?
>
yes

it was found in s390x, we could not reproduce it in x86_64 by now.
Maybe it needs low configuration cpu to reproduce.