diff --git a/kernel/time/timer_migration.c b/kernel/time/timer_migration.c
index 806c23cf71fc..059d43355e65 100644
--- a/kernel/time/timer_migration.c
+++ b/kernel/time/timer_migration.c
@@ -1847,8 +1847,10 @@ static int tmigr_setup_groups(struct tmigr_hierarchy *hier, unsigned int cpu,
 	}
 
 	/* Assert single root without parent */
-	if (WARN_ON_ONCE(i >= tmigr_hierarchy_levels))
+	if (WARN_ON_ONCE(i >= tmigr_hierarchy_levels)) {
+		kfree(stack);
 		return -EINVAL;
+	}
 
 	for (; i >= start_lvl; i--) {
 		group = stack[i];