struct request_queue *q = data;
char opbuf[16] = { }, *op;
+ /*
+ * The "state" attribute is removed after blk_cleanup_queue() has called
+ * blk_mq_free_queue(). Return if QUEUE_FLAG_DEAD has been set to avoid
+ * triggering a use-after-free.
+ */
+ if (blk_queue_dead(q))
+ return -ENOENT;
+
if (count >= sizeof(opbuf)) {
pr_err("%s: operation too long\n", __func__);
goto inval;