[PATCH 4.16 32/52] drm/vmwgfx: Fix a buffer object leak

[Greg Kroah-Hartman]

4.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Thomas Hellstrom <thellstrom@xxxxxxxxxx>

commit 13f149d47392782baafd96d54d4e65f3b5ca342f upstream.

A buffer object leak was introduced when fixing a premature buffer
object release. Fix this.

Cc: <stable@xxxxxxxxxxxxxxx>
Fixes: 73a88250b709 ("Fix a destoy-while-held mutex problem.")
Signed-off-by: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
Reviewed-by: Deepak Rawat <drawat@xxxxxxxxxx>
Reviewed-by: Sinclair Yeh <syeh@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/gpu/drm/vmwgfx/vmwgfx_kms.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
@@ -2598,6 +2598,7 @@ void vmw_kms_helper_resource_finish(stru
 		vmw_kms_helper_buffer_finish(res->dev_priv, NULL, ctx->buf,
 					     out_fence, NULL);
 
+	vmw_dmabuf_unreference(&ctx->buf);
 	vmw_resource_unreserve(res, false, NULL, 0);
 	mutex_unlock(&res->dev_priv->cmdbuf_mutex);
 }