drm/virtio: Fixes a potential NULL pointer dereference on probe failure

The dev->dev_private might not be allocated if virtio_gpu_pci_quirk()
or virtio_gpu_init() failed. In this case, we should avoid the cleanup
in virtio_gpu_release().

Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20210517084913.403-1-xieyongji@bytedance.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

diff --git a/drivers/gpu/drm/virtio/virtgpu_kms.c b/drivers/gpu/drm/virtio/virtgpu_kms.c
index b375394..aa532ad 100644 (file)
--- a/drivers/gpu/drm/virtio/virtgpu_kms.c
+++ b/drivers/gpu/drm/virtio/virtgpu_kms.c
@@ -264,6 +264,9 @@ void virtio_gpu_release(struct drm_device *dev)
 {
        struct virtio_gpu_device *vgdev = dev->dev_private;
 
+       if (!vgdev)
+               return;
+
        virtio_gpu_modeset_fini(vgdev);
        virtio_gpu_free_vbufs(vgdev);
        virtio_gpu_cleanup_cap_cache(vgdev);