Make sure elemcnt does not exceed the maximum element count in
virtio_gpu_queue_ctrl_sgs. We should improve our error handling or
impose a size limit on execbuffer, which are TODOs.
Signed-off-by: Chia-I Wu <olva...@gmail.com>
Cc: David Riley <davidri...@chromium.org>
---
drivers/gpu/drm/virtio/virtgpu_drv.h | 1 +
drivers/gpu/drm/virtio/virtgpu_ioctl.c | 3 +++
drivers/gpu/drm/virtio/virtgpu_kms.c | 2 ++
drivers/gpu/drm/virtio/virtgpu_vq.c | 2 +-
4 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h
b/drivers/gpu/drm/virtio/virtgpu_drv.h
index 7e69c06e168ea..f7520feb39d4b 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -143,6 +143,7 @@ struct virtio_gpu_framebuffer {
struct virtio_gpu_queue {
struct virtqueue *vq;
+ unsigned int max_free;
spinlock_t qlock;
wait_queue_head_t ack_queue;
struct work_struct dequeue_work;
diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index 205ec4abae2b9..0954f61d2000f 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -132,6 +132,9 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device
*dev, void *data,
goto out_unused_fd;
}
+ /* XXX virtio_gpu_cmd_submit may fail silently when exbuf->size is
+ * huge
+ */
buf = vmemdup_user(u64_to_user_ptr(exbuf->command), exbuf->size);
if (IS_ERR(buf)) {
ret = PTR_ERR(buf);
diff --git a/drivers/gpu/drm/virtio/virtgpu_kms.c
b/drivers/gpu/drm/virtio/virtgpu_kms.c
index 2f5773e43557c..e7d5840e432dc 100644
--- a/drivers/gpu/drm/virtio/virtgpu_kms.c
+++ b/drivers/gpu/drm/virtio/virtgpu_kms.c
@@ -170,7 +170,9 @@ int virtio_gpu_init(struct drm_device *dev)
goto err_vqs;
}
vgdev->ctrlq.vq = vqs[0];
+ vgdev->ctrlq.max_free = vqs[0]->num_free;
vgdev->cursorq.vq = vqs[1];
+ vgdev->cursorq.max_free = vqs[1]->num_free;
ret = virtio_gpu_alloc_vbufs(vgdev);
if (ret) {
DRM_ERROR("failed to alloc vbufs\n");
diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c
b/drivers/gpu/drm/virtio/virtgpu_vq.c
index 0bf82cff8da37..725cfe93bcef8 100644
--- a/drivers/gpu/drm/virtio/virtgpu_vq.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
@@ -333,7 +333,7 @@ static bool virtio_gpu_queue_ctrl_sgs(struct
virtio_gpu_device *vgdev,
again:
spin_lock(&vgdev->ctrlq.qlock);
- if (!vgdev->vqs_ready) {
+ if (unlikely(!vgdev->vqs_ready || elemcnt > vgdev->ctrlq.max_free)) {
spin_unlock(&vgdev->ctrlq.qlock);
if (fence && vbuf->objs)
--
2.25.0.341.g760bfbb309-goog
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