diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index e8f07305e279a6aa0b7e18920310ae45fbac6613..6c9e4857fdb8781fd9c38e26de586e7b0b6165a2 100644
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -17,6 +17,8 @@
 #include <drm/drm_prime.h>
 #include <drm/drm_print.h>
 
+#include "../../../mm/internal.h"	/* is_cow_mapping() */
+
 /**
  * DOC: overview
  *
@@ -630,6 +632,9 @@ int drm_gem_shmem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
 		return ret;
 	}
 
+	if (is_cow_mapping(vma->vm_flags))
+		return -EINVAL;
+
 	shmem = to_drm_gem_shmem_obj(obj);
 
 	ret = drm_gem_shmem_get_pages(shmem);