netdev - Re: [PATCH net] sctp: clear the transport of some out_chunk_list chunks in sctp_assoc_rm

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Message-Id: <20181029.205136.1748827502784008798.davem@davemloft.net>
Date:   Mon, 29 Oct 2018 20:51:36 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     lucien.xin@...il.com
Cc:     netdev@...r.kernel.org, linux-sctp@...r.kernel.org,
        marcelo.leitner@...il.com, nhorman@...driver.com
Subject: Re: [PATCH net] sctp: clear the transport of some out_chunk_list
 chunks in sctp_assoc_rm_peer

From: Xin Long <lucien.xin@...il.com>
Date: Mon, 29 Oct 2018 23:10:29 +0800

> If a transport is removed by asconf but there still are some chunks with
> this transport queuing on out_chunk_list, later an use-after-free issue
> will be caused when accessing this transport from these chunks in
> sctp_outq_flush().
> 
> This is an old bug, we fix it by clearing the transport of these chunks
> in out_chunk_list when removing a transport in sctp_assoc_rm_peer().
> 
> Reported-by: syzbot+56a40ceee5fb35932f4d@...kaller.appspotmail.com
> Signed-off-by: Xin Long <lucien.xin@...il.com>

Applied.