On 3/2/23 20:28, Harshit Mogalapalli wrote:

In virtio_gpu_object_shmem_init() we are passing NULL to PTR_ERR, which is returning 0/success.

Fix this by storing error value in 'ret' variable before assigning shmem->pages to NULL.

Found using static analysis with Smatch.

Fixes: 64b88afbd92f ("drm/virtio: Correct drm_gem_shmem_get_sg_table() error handling") Signed-off-by: Harshit Mogalapalli harshit.m.mogalapalli@oracle.com

---

Only compile tested.

Upstream commit b5c9ed70d1a9 ("drm/virtio: Improve DMA API usage for shmem BOs") deleted this code, so this patch is not necessary in linux-6.1.y and linux-6.2.y.

---

drivers/gpu/drm/virtio/virtgpu_object.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c b/drivers/gpu/drm/virtio/virtgpu_object.c index 168148686001..49fa59e09187 100644 --- a/drivers/gpu/drm/virtio/virtgpu_object.c +++ b/drivers/gpu/drm/virtio/virtgpu_object.c @@ -159,8 +159,9 @@ static int virtio_gpu_object_shmem_init(struct virtio_gpu_device *vgdev, shmem->pages = drm_gem_shmem_get_sg_table(&bo->base.base); if (IS_ERR(shmem->pages)) { drm_gem_shmem_unpin(&bo->base.base);

• ret = PTR_ERR(shmem->pages);
  

  shmem->pages = NULL;

• return PTR_ERR(shmem->pages);
  

• return ret;
  

  }

if (use_dma_api) {

Reviewed-by: Dmitry Osipenko dmitry.osipenko@collabora.com