linux-kernel - Re: [PATCH v2 1/3] drm/vc4: Start using u64_to_user_ptr.

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Date:   Wed, 26 Jul 2017 13:28:15 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Eric Anholt <eric@...olt.net>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] drm/vc4: Start using u64_to_user_ptr.

On Tue, Jul 25, 2017 at 11:27:16AM -0700, Eric Anholt wrote:
> Chris Wilson pointed out this little cleanup in a review of new code,
> so let's fix up the code I was copying from.
> 
> Signed-off-by: Eric Anholt <eric@...olt.net>

Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>

> ---
>  drivers/gpu/drm/vc4/vc4_gem.c | 11 +++++------
>  1 file changed, 5 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/vc4/vc4_gem.c b/drivers/gpu/drm/vc4/vc4_gem.c
> index d5b821ad06af..595f93f57821 100644
> --- a/drivers/gpu/drm/vc4/vc4_gem.c
> +++ b/drivers/gpu/drm/vc4/vc4_gem.c
> @@ -119,7 +119,7 @@ vc4_get_hang_state_ioctl(struct drm_device *dev, void *data,
>  		bo_state[i].size = vc4_bo->base.base.size;
>  	}
>  
> -	if (copy_to_user((void __user *)(uintptr_t)get_state->bo,
> +	if (copy_to_user(u64_to_user_ptr(get_state->bo),
>  			 bo_state,
>  			 state->bo_count * sizeof(*bo_state)))
>  		ret = -EFAULT;
> @@ -678,8 +678,7 @@ vc4_cl_lookup_bos(struct drm_device *dev,
>  		goto fail;
>  	}
>  
> -	if (copy_from_user(handles,
> -			   (void __user *)(uintptr_t)args->bo_handles,
> +	if (copy_from_user(handles, u64_to_user_ptr(args->bo_handles),
>  			   exec->bo_count * sizeof(uint32_t))) {
>  		ret = -EFAULT;
>  		DRM_ERROR("Failed to copy in GEM handles\n");
> @@ -755,21 +754,21 @@ vc4_get_bcl(struct drm_device *dev, struct vc4_exec_info *exec)
>  	exec->shader_state_size = args->shader_rec_count;
>  
>  	if (copy_from_user(bin,
> -			   (void __user *)(uintptr_t)args->bin_cl,
> +			   u64_to_user_ptr(args->bin_cl),
>  			   args->bin_cl_size)) {
>  		ret = -EFAULT;
>  		goto fail;
>  	}
>  
>  	if (copy_from_user(exec->shader_rec_u,
> -			   (void __user *)(uintptr_t)args->shader_rec,
> +			   u64_to_user_ptr(args->shader_rec),
>  			   args->shader_rec_size)) {
>  		ret = -EFAULT;
>  		goto fail;
>  	}
>  
>  	if (copy_from_user(exec->uniforms_u,
> -			   (void __user *)(uintptr_t)args->uniforms,
> +			   u64_to_user_ptr(args->uniforms),
>  			   args->uniforms_size)) {
>  		ret = -EFAULT;
>  		goto fail;
> -- 
> 2.11.0
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

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

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