[PATCH] virtio-gpu: fix shift wrapping bug in virtio_gpu_fence_event_create()

[Dan Carpenter]

On Thu, Sep 15, 2022 at 05:45:46PM -0700, Chia-I Wu wrote:
> On Thu, Sep 15, 2022 at 4:14 AM Dan Carpenter <dan.carpenter at oracle.com> wrote:
> >
> > The ->ring_idx_mask variable is a u64 so static checkers, Smatch in
> > this case, complain if the BIT() is not also a u64.
> >
> > drivers/gpu/drm/virtio/virtgpu_ioctl.c:50 virtio_gpu_fence_event_create()
> > warn: should '(1 << ring_idx)' be a 64 bit type?
> >
> > Fixes: cd7f5ca33585 ("drm/virtio: implement context init: add virtio_gpu_fence_event")
> > Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>
> > ---
> >  drivers/gpu/drm/virtio/virtgpu_ioctl.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
> > index 3b1701607aae..14eedb75f8a8 100644
> > --- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
> > +++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
> > @@ -47,7 +47,7 @@ static int virtio_gpu_fence_event_create(struct drm_device *dev,
> >         struct virtio_gpu_fence_event *e = NULL;
> >         int ret;
> >
> > -       if (!(vfpriv->ring_idx_mask & (1 << ring_idx)))
> > +       if (!(vfpriv->ring_idx_mask & (1ULL << ring_idx)))
> BIT_ULL(ring_indx)?
> 

Sure.  I can resend.

regards,
dan carpenter