1 files changed, 2 insertions, 0 deletions

diff --git a/mm/sparse.c b/mm/sparse.c
index fa933f43b2c9..42ca0ea9af1b 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -130,6 +130,8 @@ int __section_nr(struct mem_section* ms)
                      break;
         }
 
+        VM_BUG_ON(root_nr == NR_SECTION_ROOTS);
+
         return (root_nr * SECTIONS_PER_ROOT) + (ms - root);
 }