[PATCH v6 05/22] drm/virtio: Correct drm_gem_shmem_get_sg_table() error handling

[Dmitry Osipenko <dmitry.osipenko@collabora.com>]

drm_gem_shmem_get_sg_table() never ever returned NULL on error. Correct
the error handling to avoid crash on OOM.

Cc: stable@vger.kernel.org
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
---
 drivers/gpu/drm/virtio/virtgpu_object.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c b/drivers/gpu/drm/virtio/virtgpu_object.c
index f293e6ad52da..3d0c8d4d1c20 100644
--- a/drivers/gpu/drm/virtio/virtgpu_object.c
+++ b/drivers/gpu/drm/virtio/virtgpu_object.c
@@ -168,9 +168,11 @@ static int virtio_gpu_object_shmem_init(struct virtio_gpu_device *vgdev,
 	 * since virtio_gpu doesn't support dma-buf import from other devices.
 	 */
 	shmem->pages = drm_gem_shmem_get_sg_table(&bo->base);
-	if (!shmem->pages) {
+	ret = PTR_ERR_OR_ZERO(shmem->pages);
+	if (ret) {
 		drm_gem_shmem_unpin(&bo->base);
-		return -EINVAL;
+		shmem->pages = NULL;
+		return ret;
 	}
 
 	if (use_dma_api) {
-- 
2.35.3