diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 56fe96319..476e1d1eb 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -621,6 +621,8 @@ char *widen_string(char *buf, int n, char *end, struct printf_spec spec)
 	return buf;
 }
 
+/* Safe default value */
+const char *s = "";
 /* Handle string from a well known address. */
 static char *string_nocheck(char *buf, char *end, const char *s,
 			    struct printf_spec spec)
diff --git a/mm/slub.c b/mm/slub.c
index 1f50129dc..644bdb921 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -4071,6 +4071,9 @@ struct kmem_cache *slab_pre_alloc_hook(struct kmem_cache *s, gfp_t flags)
 	return s;
 }
 
+/* Safe default value */
+const char *s = "";
+
 static __fastpath_inline
 bool slab_post_alloc_hook(struct kmem_cache *s, struct list_lru *lru,
 			  gfp_t flags, size_t size, void **p, bool init,