diff --git a/bsd-core/drm_vm.c b/bsd-core/drm_vm.c
index 814cc8bf..fc0c4a78 100644
--- a/bsd-core/drm_vm.c
+++ b/bsd-core/drm_vm.c
@@ -26,6 +26,8 @@ int DRM(mmap)(dev_t kdev, vm_offset_t offset, int prot)
 	
 /*	DRM_DEBUG("offset = 0x%x\n", offset);*/
 
+	if (!priv->authenticated) DRM_OS_RETURN(EACCES);
+
 	if (dev->dma
 	    && offset >= 0
 	    && offset < ptoa(dev->dma->page_count))
diff --git a/bsd/drm_vm.h b/bsd/drm_vm.h
index 814cc8bf..fc0c4a78 100644
--- a/bsd/drm_vm.h
+++ b/bsd/drm_vm.h
@@ -26,6 +26,8 @@ int DRM(mmap)(dev_t kdev, vm_offset_t offset, int prot)
 	
 /*	DRM_DEBUG("offset = 0x%x\n", offset);*/
 
+	if (!priv->authenticated) DRM_OS_RETURN(EACCES);
+
 	if (dev->dma
 	    && offset >= 0
 	    && offset < ptoa(dev->dma->page_count))
diff --git a/linux-core/drm_vm.c b/linux-core/drm_vm.c
index 771c11bd..f7b06767 100644
--- a/linux-core/drm_vm.c
+++ b/linux-core/drm_vm.c
@@ -377,6 +377,8 @@ int DRM(mmap)(struct file *filp, struct vm_area_struct *vma)
 	DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n",
 		  vma->vm_start, vma->vm_end, VM_OFFSET(vma));
 
+	if ( !priv->authenticated ) DRM_OS_RETURN(EACCES);
+
 	if (!VM_OFFSET(vma)) return DRM(mmap_dma)(filp, vma);
 
 				/* A sequential search of a linked list is
diff --git a/linux/drm_vm.h b/linux/drm_vm.h
index 771c11bd..f7b06767 100644
--- a/linux/drm_vm.h
+++ b/linux/drm_vm.h
@@ -377,6 +377,8 @@ int DRM(mmap)(struct file *filp, struct vm_area_struct *vma)
 	DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n",
 		  vma->vm_start, vma->vm_end, VM_OFFSET(vma));
 
+	if ( !priv->authenticated ) DRM_OS_RETURN(EACCES);
+
 	if (!VM_OFFSET(vma)) return DRM(mmap_dma)(filp, vma);
 
 				/* A sequential search of a linked list is