Re: [PATCH] drm/i915/gvt: Off by one in intel_vgpu_write_fence()

Rodrigo Vivi
2018-08-07T14:26:46Z

On Tue, Aug 07, 2018 at 09:46:02AM +0300, Dan Carpenter wrote:
> The > should be >= here so that we don't read one element beyond the
> end of the array.
>
> Fixes: 28a60dee2ce6 ("drm/i915/gvt: vGPU HW resource management")
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

>
> diff --git a/drivers/gpu/drm/i915/gvt/aperture_gm.c b/drivers/gpu/drm/i915/gvt/aperture_gm.c
> index 380eeb2a0e83..fe754022e356 100644
> --- a/drivers/gpu/drm/i915/gvt/aperture_gm.c
> +++ b/drivers/gpu/drm/i915/gvt/aperture_gm.c
> @@ -131,7 +131,7 @@ void intel_vgpu_write_fence(struct intel_vgpu *vgpu,
>
> assert_rpm_wakelock_held(dev_priv);
>
> - if (WARN_ON(fence > vgpu_fence_sz(vgpu)))
> + if (WARN_ON(fence >= vgpu_fence_sz(vgpu)))
> return;
>
> reg = vgpu->fence.regs[fence];