[PATCH 4.4 101/188] drm/virtio: Fix double free on probe failure

[Greg Kroah-Hartman]

From: Xie Yongji <xieyongji@xxxxxxxxxxxxx>

[ Upstream commit cec7f1774605a5ef47c134af62afe7c75c30b0ee ]

The virtio_gpu_init() will free vgdev and vgdev->vbufs on failure.
But such failure will be caught by virtio_gpu_probe() and then
virtio_gpu_release() will be called to do some cleanup which
will free vgdev and vgdev->vbufs again. So let's set dev->dev_private
to NULL to avoid double free.

Signed-off-by: Xie Yongji <xieyongji@xxxxxxxxxxxxx>
Link: http://patchwork.freedesktop.org/patch/msgid/20210517084913.403-2-xieyongji@xxxxxxxxxxxxx
Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/gpu/drm/virtio/virtgpu_kms.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/virtio/virtgpu_kms.c b/drivers/gpu/drm/virtio/virtgpu_kms.c
index 476b9993b068..44f9762e86e8 100644
--- a/drivers/gpu/drm/virtio/virtgpu_kms.c
+++ b/drivers/gpu/drm/virtio/virtgpu_kms.c
@@ -233,6 +233,7 @@ err_ttm:
 err_vbufs:
 	vgdev->vdev->config->del_vqs(vgdev->vdev);
 err_vqs:
+	dev->dev_private = NULL;
 	kfree(vgdev);
 	return ret;
 }
-- 
2.30.2