Commit 12afce08 authored by Gerd Hoffmann's avatar Gerd Hoffmann
Browse files

drm/virtio: add fence sanity check 



Make sure we don't leak half-initialized fences outside the driver.

Signed-off-by: default avatarGerd Hoffmann <kraxel@redhat.com>
Reviewed-by: default avatarChia-I Wu <olvaffe@gmail.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20190829103301.3539-19-kraxel@redhat.com
parent 6e337250

drivers/gpu/drm/virtio/virtgpu_fence.c

+4 −0
Original line number Diff line number Diff line
@@ -41,6 +41,10 @@ bool virtio_fence_signaled(struct dma_fence *f) 
{

	struct virtio_gpu_fence *fence = to_virtio_fence(f);



	if (WARN_ON_ONCE(fence->f.seqno == 0))

		/* leaked fence outside driver before completing

		 * initialization with virtio_gpu_fence_emit */

		return false;

	if (atomic64_read(&fence->drv->last_seq) >= fence->f.seqno)

		return true;

	return false;

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