Merge tag 'drm-fixes-for-v4.16-rc4' of git://people.freedesktop.org/~airlied/linux

Pull drm fixes from Dave Airlie:
 "Pretty much run of the mill drm fixes.

  amdgpu:
   - power management fixes
   - some display fixes
   - one ppc 32-bit dma fix

  i915:
   - two display fixes
   - three gem fixes

  sun4i:
   - display regression fixes

  nouveau:
   - display regression fix

  virtio-gpu:
   - dumb airlied ioctl fix"

* tag 'drm-fixes-for-v4.16-rc4' of git://people.freedesktop.org/~airlied/linux: (25 commits)
  drm/amdgpu: skip ECC for SRIOV in gmc late_init
  drm/amd/amdgpu: Correct VRAM width for APUs with GMC9
  drm/amdgpu: fix&cleanups for wb_clear
  drm/amdgpu: Correct sdma_v4 get_wptr(v2)
  drm/amd/powerplay: fix power over limit on Fiji
  drm/amdgpu:Fixed wrong emit frame size for enc
  drm/amdgpu: move WB_FREE to correct place
  drm/amdgpu: only flush hotplug work without DC
  drm/amd/display: check for ipp before calling cursor operations
  drm/i915: Make global seqno known in i915_gem_request_execute tracepoint
  drm/i915: Clear the in-use marker on execbuf failure
  drm/i915/cnl: Fix PORT_TX_DW5/7 register address
  drm/i915/audio: fix check for av_enc_map overflow
  drm/i915: Fix rsvd2 mask when out-fence is returned
  virtio-gpu: fix ioctl and expose the fixed status to userspace.
  drm/sun4i: Protect the TCON pixel clocks
  drm/sun4i: Enable the output on the pins (tcon0)
  drm/nouveau: prefer XBGR2101010 for addfb ioctl
  drm/radeon: insist on 32-bit DMA for Cedar on PPC64/PPC64LE
  drm/amd/display: VGA black screen from s3 when attached to hook
  ...

1 files changed, 11 insertions, 6 deletions

diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index 5720a0d4ac0a..677ac16c8a6d 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -197,6 +197,9 @@ static int virtio_gpu_getparam_ioctl(struct drm_device *dev, void *data,
 	case VIRTGPU_PARAM_3D_FEATURES:
 		value = vgdev->has_virgl_3d == true ? 1 : 0;
 		break;
+	case VIRTGPU_PARAM_CAPSET_QUERY_FIX:
+		value = 1;
+		break;
 	default:
 		return -EINVAL;
 	}
@@ -472,7 +475,7 @@ static int virtio_gpu_get_caps_ioctl(struct drm_device *dev,
 {
 	struct virtio_gpu_device *vgdev = dev->dev_private;
 	struct drm_virtgpu_get_caps *args = data;
-	int size;
+	unsigned size, host_caps_size;
 	int i;
 	int found_valid = -1;
 	int ret;
@@ -481,6 +484,10 @@ static int virtio_gpu_get_caps_ioctl(struct drm_device *dev,
 	if (vgdev->num_capsets == 0)
 		return -ENOSYS;
 
+	/* don't allow userspace to pass 0 */
+	if (args->size == 0)
+		return -EINVAL;
+
 	spin_lock(&vgdev->display_info_lock);
 	for (i = 0; i < vgdev->num_capsets; i++) {
 		if (vgdev->capsets[i].id == args->cap_set_id) {
@@ -496,11 +503,9 @@ static int virtio_gpu_get_caps_ioctl(struct drm_device *dev,
 		return -EINVAL;
 	}
 
-	size = vgdev->capsets[found_valid].max_size;
-	if (args->size > size) {
-		spin_unlock(&vgdev->display_info_lock);
-		return -EINVAL;
-	}
+	host_caps_size = vgdev->capsets[found_valid].max_size;
+	/* only copy to user the minimum of the host caps size or the guest caps size */
+	size = min(args->size, host_caps_size);
 
 	list_for_each_entry(cache_ent, &vgdev->cap_cache, head) {
 		if (cache_ent->id == args->cap_set_id &&