Re: [PATCH v7 1/2] drm/shmem-helper: Add missing vunmap on error

[Daniel Vetter <daniel@ffwll.ch>]

On Thu, Jun 30, 2022 at 11:00:57PM +0300, Dmitry Osipenko wrote:
> The vmapping of dma-buf may succeed, but DRM SHMEM rejects the IOMEM
> mapping, and thus, drm_gem_shmem_vmap_locked() should unvmap the IOMEM
> before erroring out.
> 
> Cc: stable@vger.kernel.org
> Fixes: 49a3f51dfeee ("drm/gem: Use struct dma_buf_map in GEM vmap ops and convert GEM backends")
> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>

Pushed to drm-misc-next-fixes, thanks for your patch.
-Daniel

> ---
>  drivers/gpu/drm/drm_gem_shmem_helper.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
> index 8ad0e02991ca..904fc893c905 100644
> --- a/drivers/gpu/drm/drm_gem_shmem_helper.c
> +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
> @@ -302,6 +302,7 @@ static int drm_gem_shmem_vmap_locked(struct drm_gem_shmem_object *shmem,
>  		ret = dma_buf_vmap(obj->import_attach->dmabuf, map);
>  		if (!ret) {
>  			if (WARN_ON(map->is_iomem)) {
> +				dma_buf_vunmap(obj->import_attach->dmabuf, map);
>  				ret = -EIO;
>  				goto err_put_pages;
>  			}
> -- 
> 2.36.1
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch