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

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Message-ID: <000000000000cd76fb0596c1d41c@google.com>
Date:   Thu, 07 Nov 2019 05:42:06 -0800
From:   syzbot <syzbot+e8c1d30881266e47eb33@...kaller.appspotmail.com>
To:     ast@...nel.org, bpf@...r.kernel.org, daniel@...earbox.net,
        davem@...emloft.net, dsahern@...il.com,
        herbert@...dor.apana.org.au, johannes.berg@...el.com, kafai@...com,
        kuznet@....inr.ac.ru, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, posk@...gle.com, songliubraving@...com,
        steffen.klassert@...unet.com, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de, willemb@...gle.com, yhs@...com,
        yoshfuji@...ux-ipv6.org
Subject: Re: KASAN: use-after-free Read in _decode_session6

syzbot suspects this bug was fixed by commit:

commit e7c87bd6cc4ec7b0ac1ed0a88a58f8206c577488
Author: Willem de Bruijn <willemb@...gle.com>
Date:   Wed Jan 16 01:19:22 2019 +0000

     bpf: in __bpf_redirect_no_mac pull mac only if present

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1736f974600000
start commit:   b36fdc68 Merge tag 'gpio-v4.19-2' of git://git.kernel.org/..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=4c7e83258d6e0156
dashboard link: https://syzkaller.appspot.com/bug?extid=e8c1d30881266e47eb33
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14d42021400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13d09f1e400000

If the result looks correct, please mark the bug fixed by replying with:

#syz fix: bpf: in __bpf_redirect_no_mac pull mac only if present

For information about bisection process see: https://goo.gl/tpsmEJ#bisection