linux-kernel - Re: [syzbot] KASAN: use-after-free Read in veth_xdp

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Message-ID: <0000000000000f890905d56670f5@google.com>
Date:   Wed, 12 Jan 2022 10:07:06 -0800
From:   syzbot <syzbot+67f89551088ea1a6850e@...kaller.appspotmail.com>
To:     andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org,
        daniel@...earbox.net, davem@...emloft.net, fgheet255t@...il.com,
        hawk@...nel.org, john.fastabend@...il.com, kafai@...com,
        kpsingh@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, pabeni@...hat.com, songliubraving@...com,
        syzkaller-bugs@...glegroups.com, toke@...hat.com, toke@...e.dk,
        yhs@...com
Subject: Re: [syzbot] KASAN: use-after-free Read in veth_xdp_rcv

syzbot suspects this issue was fixed by commit:

commit 2cbad989033bff0256675c38f96f5faab852af4b
Author: Paolo Abeni <pabeni@...hat.com>
Date:   Tue Nov 30 10:08:06 2021 +0000

    bpf: Do not WARN in bpf_warn_invalid_xdp_action()

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=14e9e1ddb00000
start commit:   252c765bd764 riscv, bpf: Add BPF exception tables
git tree:       bpf-next
kernel config:  https://syzkaller.appspot.com/x/.config?x=f60548b4c38ae4a8
dashboard link: https://syzkaller.appspot.com/bug?extid=67f89551088ea1a6850e
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1797fcf2b00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10e71f9f300000

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

#syz fix: bpf: Do not WARN in bpf_warn_invalid_xdp_action()

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