1 files changed, 1 insertions, 1 deletions

diff --git a/lib/idr.c b/lib/idr.c
index 81fc430602ee..c5be889de449 100644
--- a/lib/idr.c
+++ b/lib/idr.c
@@ -175,7 +175,7 @@ build_up:
          * Add a new layer to the top of the tree if the requested
          * id is larger than the currently allocated space.
          */
-        while ((layers < MAX_LEVEL) && (id >= (1 << (layers*IDR_BITS)))) {
+        while ((layers < (MAX_LEVEL - 1)) && (id >= (1 << (layers*IDR_BITS)))) {
                 layers++;
                 if (!p->count)
                         continue;