diff --git a/scsi-cdrom-Fix-crash-after-remote-cdrom-detached.patch b/scsi-cdrom-Fix-crash-after-remote-cdrom-detached.patch
new file mode 100644
index 0000000..d1147fc
--- /dev/null
+++ b/scsi-cdrom-Fix-crash-after-remote-cdrom-detached.patch
@@ -0,0 +1,35 @@
+From 77496578b22e127eb50a5a8c463e92fb3245a7e0 Mon Sep 17 00:00:00 2001
+From: WangJian <wangjian161@huawei.com>
+Date: Wed, 9 Feb 2022 11:42:47 +0800
+Subject: [PATCH] scsi: cdrom: Fix crash after remote cdrom detached
+
+There is a small window between the twice blk_is_available in
+scsi_disk_emulate_command which would cause crash due to the later
+assertion if the remote cdrom is detached in this window.
+
+So this patch replaces assertions with return to avoid qemu crash.
+
+Signed-off-by: wangjian161 <wangjian161@huawei.com>
+---
+ hw/scsi/scsi-disk.c | 5 ++++-
+ 1 file changed, 4 insertions(+), 1 deletion(-)
+
+diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
+index d4914178ea..a1053f4036 100644
+--- a/hw/scsi/scsi-disk.c
++++ b/hw/scsi/scsi-disk.c
+@@ -1930,7 +1930,10 @@ static int32_t scsi_disk_emulate_command(SCSIRequest *req, uint8_t *buf)
+     memset(outbuf, 0, r->buflen);
+     switch (req->cmd.buf[0]) {
+     case TEST_UNIT_READY:
+-        assert(blk_is_available(s->qdev.conf.blk));
++        if (!blk_is_available(s->qdev.conf.blk)) {
++            scsi_check_condition(r, SENSE_CODE(NO_MEDIUM));
++            return 0;
++        }
+         break;
+     case INQUIRY:
+         buflen = scsi_disk_emulate_inquiry(req, outbuf);
+-- 
+2.27.0
+