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-rw-r--r--lib/idr.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/idr.c b/lib/idr.c
index 1cac726c44b..0dc782216d4 100644
--- a/lib/idr.c
+++ b/lib/idr.c
@@ -156,10 +156,12 @@ static int sub_alloc(struct idr *idp, int *starting_id, struct idr_layer **pa)
id = (id | ((1 << (IDR_BITS * l)) - 1)) + 1;
/* if already at the top layer, we need to grow */
- if (!(p = pa[l])) {
+ if (id >= 1 << (idp->layers * IDR_BITS)) {
*starting_id = id;
return IDR_NEED_TO_GROW;
}
+ p = pa[l];
+ BUG_ON(!p);
/* If we need to go up one layer, continue the
* loop; otherwise, restart from the top.