[PATCH 5.10] gpu/drm/virtio: fix error return in vgdev_output_init()

[Alexandr Sapozhnkiov]

From: Alexandr Sapozhnikov <alsp...@gmail.com>

Return value of function drm_crtc_init_with_planes(), 
called at virtgpu_display.c:276, is not checked, 
but it is usually checked for this function

Found by Linux Verification Center (linuxtesting.org) with SVACE.
Signed-off-by: Alexandr Sapozhnikov <alsp...@gmail.com>
---
 drivers/gpu/drm/virtio/virtgpu_display.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_display.c 
b/drivers/gpu/drm/virtio/virtgpu_display.c
index ad924a8502e9..59b652e8a630 100644
--- a/drivers/gpu/drm/virtio/virtgpu_display.c
+++ b/drivers/gpu/drm/virtio/virtgpu_display.c
@@ -253,6 +253,7 @@ static const struct drm_connector_funcs 
virtio_gpu_connector_funcs = {
 
 static int vgdev_output_init(struct virtio_gpu_device *vgdev, int index)
 {
+       int ret;
        struct drm_device *dev = vgdev->ddev;
        struct virtio_gpu_output *output = vgdev->outputs + index;
        struct drm_connector *connector = &output->conn;
@@ -273,8 +274,10 @@ static int vgdev_output_init(struct virtio_gpu_device 
*vgdev, int index)
        cursor = virtio_gpu_plane_init(vgdev, DRM_PLANE_TYPE_CURSOR, index);
        if (IS_ERR(cursor))
                return PTR_ERR(cursor);
-       drm_crtc_init_with_planes(dev, crtc, primary, cursor,
+       ret = drm_crtc_init_with_planes(dev, crtc, primary, cursor,
                                  &virtio_gpu_crtc_funcs, NULL);
+       if (ret)
+               return ret;
        drm_crtc_helper_add(crtc, &virtio_gpu_crtc_helper_funcs);
 
        drm_connector_init(dev, connector, &virtio_gpu_connector_funcs,
-- 
2.43.0