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

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Message-ID: <CANn89iKVAcX2GnQwVbQLd+ADGRVdWtD07q7=Brw5HRSoc0K2PQ@mail.gmail.com>
Date:   Tue, 21 Sep 2021 18:56:48 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     Hao Sun <sunhao.th@...il.com>
Cc:     David Miller <davem@...emloft.net>,
        David Ahern <dsahern@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        netdev <netdev@...r.kernel.org>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>, bpf <bpf@...r.kernel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        Martin KaFai Lau <kafai@...com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>
Subject: Re: KASAN: use-after-free Read in tcp_write_timer_handler

On Tue, Sep 21, 2021 at 6:43 PM Hao Sun <sunhao.th@...il.com> wrote:
>
> Hello,
>
> When using Healer to fuzz the latest Linux kernel, the following crash
> was triggered.
>

We have dozens of such reports provided already by syzbot.

If you do not provide a repro, there is little hope.