diff --git a/kernel/cgroup/dmem.c b/kernel/cgroup/dmem.c
index e12b946278b6..1f0d6caaf2fb 100644
--- a/kernel/cgroup/dmem.c
+++ b/kernel/cgroup/dmem.c
@@ -700,6 +700,9 @@ static ssize_t dmemcg_limit_write(struct kernfs_open_file *of,
 		if (!region_name[0])
 			continue;
 
+		if (!options || !*options)
+			return -EINVAL;
+
 		rcu_read_lock();
 		region = dmemcg_get_region_by_name(region_name);
 		rcu_read_unlock();