linux-kernel - Re: [syzbot] [net?] possible deadlock in inet

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Message-ID: <CANn89iJaY+MJPUJgtowZOPwHaf8ToNVxEyFN9U+Csw9+eB7YHg@mail.gmail.com>
Date: Sat, 6 Sep 2025 02:16:58 -0700
From: Eric Dumazet <edumazet@...gle.com>
To: syzbot <syzbot+e1cd6bd8493060bd701d@...kaller.appspotmail.com>, 
	Josef Bacik <josef@...icpanda.com>, Jens Axboe <axboe@...nel.dk>
Cc: davem@...emloft.net, dsahern@...nel.org, horms@...nel.org, kuba@...nel.org, 
	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org, 
	ming.lei@...hat.com, netdev@...r.kernel.org, pabeni@...hat.com, 
	syzkaller-bugs@...glegroups.com, thomas.hellstrom@...ux.intel.com
Subject: Re: [syzbot] [net?] possible deadlock in inet_shutdown

On Fri, Sep 5, 2025 at 1:03 PM Eric Dumazet <edumazet@...gle.com> wrote:
>
> On Fri, Sep 5, 2025 at 1:00 PM syzbot
> <syzbot+e1cd6bd8493060bd701d@...kaller.appspotmail.com> wrote:

Note to NBD maintainers : I held about  20 syzbot reports all pointing
to NBD accepting various sockets, I  can release them if needed, if you prefer
to triage them.

>
> Question to NBD maintainers.
>
> What socket types are supposed to be supported by NBD ?
>
> I was thinking adding a list of supported ones, assuming TCP and
> stream unix are the only ones:
>
> diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
> index 6463d0e8d0ce..87b0b78249da 100644
> --- a/drivers/block/nbd.c
> +++ b/drivers/block/nbd.c
> @@ -1217,6 +1217,14 @@ static struct socket *nbd_get_socket(struct
> nbd_device *nbd, unsigned long fd,
>         if (!sock)
>                 return NULL;
>
> +       if (!sk_is_tcp(sock->sk) &&
> +           !sk_is_stream_unix(sock->sk)) {
> +               dev_err(disk_to_dev(nbd->disk), "Unsupported socket:
> should be TCP or UNIX.\n");
> +               *err = -EINVAL;
> +               sockfd_put(sock);
> +               return NULL;
> +       }
> +
>         if (sock->ops->shutdown == sock_no_shutdown) {
>                 dev_err(disk_to_dev(nbd->disk), "Unsupported socket:
> shutdown callout must be supported.\n");
>                 *err = -EINVAL;