Re: [PATCH 1/4] vdpa_sim: Fix return value check for vdpa_alloc_device()

[Stefano Garzarella]

On Thu, Jul 15, 2021 at 04:00:23PM +0800, Xie Yongji wrote:
> The vdpa_alloc_device() returns an error pointer upon
> failure, not NULL. To handle the failure correctly, this
> replaces NULL check with IS_ERR() check and propagate the
> error upwards.
>
> Fixes: 2c53d0f64c06 ("vdpasim: vDPA device simulator")
> Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> Signed-off-by: Xie Yongji <xieyongji@xxxxxxxxxxxxx>
> ---
> drivers/vdpa/vdpa_sim/vdpa_sim.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> index 14e024de5cbf..c621cf7feec0 100644
> --- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
> +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> @@ -251,8 +251,10 @@ struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *dev_attr)
>
> 	vdpasim = vdpa_alloc_device(struct vdpasim, vdpa, NULL, ops,
> 				    dev_attr->name);
> -	if (!vdpasim)
> +	if (IS_ERR(vdpasim)) {
> +		ret = PTR_ERR(vdpasim);
> 		goto err_alloc;
> +	}
>
> 	vdpasim->dev_attr = *dev_attr;
> 	INIT_WORK(&vdpasim->work, dev_attr->work_fn);
> --
> 2.11.0

Reviewed-by: Stefano Garzarella <sgarzare@xxxxxxxxxx>