Re: [PATCH] vduse: Disallow injecting interrupt before DRIVER_OK is set

[Jason Wang <jasowang@redhat.com>]

On Thu, Sep 23, 2021 at 3:57 PM Xie Yongji <xieyongji@bytedance.com> wrote:
>
> The interrupt callback should not be triggered before DRIVER_OK
> is set. Otherwise, it might break the virtio device driver.
> So let's add a check to avoid the unexpected behavior.
>
> Fixes: c8a6153b6c59 ("vduse: Introduce VDUSE - vDPA Device in Userspace")
> Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
> ---
>  drivers/vdpa/vdpa_user/vduse_dev.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
> index 29a38ecba19e..972c13a7e5da 100644
> --- a/drivers/vdpa/vdpa_user/vduse_dev.c
> +++ b/drivers/vdpa/vdpa_user/vduse_dev.c
> @@ -968,6 +968,10 @@ static long vduse_dev_ioctl(struct file *file, unsigned int cmd,
>                 break;
>         }
>         case VDUSE_DEV_INJECT_CONFIG_IRQ:
> +               ret = -EINVAL;
> +               if (!(dev->status & VIRTIO_CONFIG_S_DRIVER_OK))
> +                       break;
> +

I wonder if we need any synchronization with set_status()?

Thanks

>                 ret = 0;
>                 queue_work(vduse_irq_wq, &dev->inject);
>                 break;
> @@ -1047,6 +1051,10 @@ static long vduse_dev_ioctl(struct file *file, unsigned int cmd,
>         case VDUSE_VQ_INJECT_IRQ: {
>                 u32 index;
>
> +               ret = -EINVAL;
> +               if (!(dev->status & VIRTIO_CONFIG_S_DRIVER_OK))
> +                       break;
> +
>                 ret = -EFAULT;
>                 if (get_user(index, (u32 __user *)argp))
>                         break;
> --
> 2.11.0
>

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