linux-kernel - Re: [PATCH v2] aio: add timeout validity check for io

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Date:   Tue, 30 Jul 2019 09:11:49 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     "zhangyi (F)" <yi.zhang@...wei.com>
Cc:     linux-aio <linux-aio@...ck.org>,
        Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Benjamin LaHaise <bcrl@...ck.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Jeff Moyer <jmoyer@...hat.com>,
        Deepa Dinamani <deepa.kernel@...il.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: Re: [PATCH v2] aio: add timeout validity check for io_[p]getevents

On Tue, Jul 30, 2019 at 3:46 AM zhangyi (F) <yi.zhang@...wei.com> wrote:

>  {
> -       ktime_t until = ts ? timespec64_to_ktime(*ts) : KTIME_MAX;
> -       struct kioctx *ioctx = lookup_ioctx(ctx_id);
> +       ktime_t until = KTIME_MAX;
> +       struct kioctx *ioctx = NULL;
>         long ret = -EINVAL;
>
> +       if (ts) {
> +               if (!timespec64_valid(ts))
> +                       return ret;
> +               until = timespec64_to_ktime(*ts);
> +       }

The man page should probably get updated as well to reflect that this
will now return -EINVAL for a negative timeout or malformed
nanoseconds.

      Arnd