linux-kernel - Re: KASAN: use-after-free Read in decode

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Date:   Tue, 3 Nov 2020 21:14:00 +0800
From:   Xin Long <lucien.xin@...il.com>
To:     syzbot <syzbot+5be8aebb1b7dfa90ef31@...kaller.appspotmail.com>
Cc:     davem <davem@...emloft.net>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Jakub Kicinski <kuba@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        network dev <netdev@...r.kernel.org>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: KASAN: use-after-free Read in decode_session6

On Sun, Nov 1, 2020 at 1:40 PM syzbot
<syzbot+5be8aebb1b7dfa90ef31@...kaller.appspotmail.com> wrote:
>
> syzbot has bisected this issue to:
>
> commit bcd623d8e9fa5f82bbd8cd464dc418d24139157b
> Author: Xin Long <lucien.xin@...il.com>
> Date:   Thu Oct 29 07:05:05 2020 +0000
>
>     sctp: call sk_setup_caps in sctp_packet_transmit instead
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=14df9cb8500000
> start commit:   68bb4665 Merge branch 'l2-multicast-forwarding-for-ocelot-..
> git tree:       net-next
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=16df9cb8500000
> console output: https://syzkaller.appspot.com/x/log.txt?x=12df9cb8500000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=eac680ae76558a0e
> dashboard link: https://syzkaller.appspot.com/bug?extid=5be8aebb1b7dfa90ef31
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11286398500000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11bbf398500000
>
> Reported-by: syzbot+5be8aebb1b7dfa90ef31@...kaller.appspotmail.com
> Fixes: bcd623d8e9fa ("sctp: call sk_setup_caps in sctp_packet_transmit instead")
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
I'm looking into this, Thanks.