diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index a3e65c8cf29e..76ce2d124079 100644
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -1003,8 +1003,16 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
 				return -ENOMEM;
 			}
 		} else {
-			err = idr_alloc_u32(&tp_c->handle_idr, ht, &handle,
-					    handle, GFP_KERNEL);
+			/* The IDR is keyed on the mapped id, and that is
+			 * what the destroy paths remove. Ask for it here,
+			 * so a manual handle colliding with the
+			 * auto-allocated id space is rejected (-ENOSPC)
+			 * instead of aliasing a future auto id.
+			 */
+			u32 id = handle2id(handle);
+
+			err = idr_alloc_u32(&tp_c->handle_idr, ht, &id, id,
+					    GFP_KERNEL);
 			if (err) {
 				kfree(ht);
 				return err;