netdev - Re: KASAN: use-after-free Read in sctp_do

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Date:   Tue, 8 May 2018 15:57:32 -0300
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     Xin Long <lucien.xin@...il.com>
Cc:     syzbot <syzbot+141d898c5f24489db4aa@...kaller.appspotmail.com>,
        davem <davem@...emloft.net>, LKML <linux-kernel@...r.kernel.org>,
        linux-sctp@...r.kernel.org, network dev <netdev@...r.kernel.org>,
        Neil Horman <nhorman@...driver.com>,
        syzkaller-bugs@...glegroups.com,
        Vlad Yasevich <vyasevich@...il.com>
Subject: Re: KASAN: use-after-free Read in sctp_do_sm

On Wed, May 09, 2018 at 01:41:03AM +0800, Xin Long wrote:
...
> >  sctp_chunk_destroy net/sctp/sm_make_chunk.c:1481 [inline]
> >  sctp_chunk_put+0x321/0x440 net/sctp/sm_make_chunk.c:1504
> >  sctp_ulpevent_make_rcvmsg+0x955/0xd40 net/sctp/ulpevent.c:718
> There's no reason to put the chunk in sctp_ulpevent_make_rcvmsg's
> fail_mark err path before holding this chunk later there.
>
> We should just remove it.

Oups. Agreed.

  Marcelo