linux-kernel - Re: [PATCH] fuse: Put leaked request on error path of fuse

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Message-ID: <CAJfpegtMmrvnZE3xtMDNTmF=pSmqFROtehamivbLeAh2E_qZ6Q@mail.gmail.com>
Date:   Tue, 6 Nov 2018 10:23:28 +0100
From:   Miklos Szeredi <miklos@...redi.hu>
To:     Kirill Tkhai <ktkhai@...tuozzo.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fuse: Put leaked request on error path of fuse_retrieve()

On Tue, Nov 6, 2018 at 10:13 AM, Kirill Tkhai <ktkhai@...tuozzo.com> wrote:
> fuse_request_send_notify_reply() may fail, and this case
> it remains leaked (fuse_retrieve_end(), which is called
> on error path, does not do that). Also, fc->num_waiting,
> will never be decremented, and fuse_wait_aborted() will
> never finish. So, put the request patently.
>
> Signed-off-by: Kirill Tkhai <ktkhai@...tuozzo.com>

Posted same patch yesterday for a syzbot report.   How did you notice this?

Thanks,
Miklos


> ---
>  fs/fuse/dev.c |    4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
> index ae813e609932..6fe330cc9709 100644
> --- a/fs/fuse/dev.c
> +++ b/fs/fuse/dev.c
> @@ -1768,8 +1768,10 @@ static int fuse_retrieve(struct fuse_conn *fc, struct inode *inode,
>         req->in.args[1].size = total_len;
>
>         err = fuse_request_send_notify_reply(fc, req, outarg->notify_unique);
> -       if (err)
> +       if (err) {
>                 fuse_retrieve_end(fc, req);
> +               fuse_put_request(fc, req);
> +       }
>
>         return err;
>  }
>