FAILED: patch "[PATCH] drm/amd/amdgpu: validate the shadow BO." failed to apply to 4.9-stable tree

The patch below does not apply to the 4.9-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From: Alex Xie <[email protected]>
Date: Wed, 30 Nov 2016 17:19:40 -0500
Subject: [PATCH] drm/amd/amdgpu: validate the shadow BO.
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Fixes a rare NULL pointer dereference in amdgpu_ttm_bind.

The issue was found by Nicolai Haehnle.
The patch was tested by Nicolai Haehnle.

index 5a277495d6a3..29d6d84d1c28 100644
@@ -451,7 +451,7 @@ static int amdgpu_cs_validate(void *param, struct amdgpu_bo *bo)
 		return r;
 
 	if (bo->shadow)
-		r = amdgpu_cs_bo_validate(p, bo);
+		r = amdgpu_cs_bo_validate(p, bo->shadow);
 
 	return r;
 }