diff mbox series

drm/i915/gvt: Off by one in intel_vgpu_write_fence()

Message ID 20180807064602.sagf25ettlvfpidm@kili.mountain (mailing list archive)
State New, archived
Headers show
Series drm/i915/gvt: Off by one in intel_vgpu_write_fence() | expand

Commit Message

Dan Carpenter Aug. 7, 2018, 6:46 a.m. UTC 
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>

Comments

Rodrigo Vivi Aug. 7, 2018, 2:26 p.m. UTC | #1 
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];
diff mbox series

Patch

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];