3 files changed, 4 insertions, 4 deletions

diff --git a/include/linux/user_namespace.h b/include/linux/user_namespace.h
index bb320573bb9e..1101b0ce878f 100644
--- a/include/linux/user_namespace.h
+++ b/include/linux/user_namespace.h
@@ -49,7 +49,7 @@ static inline struct user_namespace *copy_user_ns(int flags,
         if (flags & CLONE_NEWUSER)
                 return ERR_PTR(-EINVAL);
 
-        return NULL;
+        return old_ns;
 }
 
 static inline void put_user_ns(struct user_namespace *ns)
diff --git a/mm/slab.c b/mm/slab.c
index 88bc6336ce3d..c3feeaab3875 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -3690,8 +3690,8 @@ static __always_inline void *__do_kmalloc(size_t size, gfp_t flags,
          * functions.
          */
         cachep = __find_general_cachep(size, flags);
-        if (unlikely(cachep == NULL))
-                return NULL;
+        if (unlikely(ZERO_OR_NULL_PTR(cachep)))
+                return cachep;
         return __cache_alloc(cachep, flags, caller);
 }
 
diff --git a/mm/slub.c b/mm/slub.c
index 52a4f44be394..322f3a5d72c7 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2394,7 +2394,7 @@ size_t ksize(const void *object)
         struct page *page;
         struct kmem_cache *s;
 
-        if (object == ZERO_SIZE_PTR)
+        if (ZERO_OR_NULL_PTR(object))
                 return 0;
 
         page = get_object_page(object);