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-rw-r--r--hw/usb/dev-storage.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/hw/usb/dev-storage.c b/hw/usb/dev-storage.c
index d865a5ef93..3d2f244127 100644
--- a/hw/usb/dev-storage.c
+++ b/hw/usb/dev-storage.c
@@ -268,7 +268,6 @@ static void usb_msd_request_cancelled(SCSIRequest *req)
     if (req == s->req) {
         scsi_req_unref(s->req);
         s->req = NULL;
-        s->packet = NULL;
         s->scsi_len = 0;
     }
 }
@@ -330,6 +329,9 @@ static void usb_msd_cancel_io(USBDevice *dev, USBPacket *p)
 {
     MSDState *s = DO_UPCAST(MSDState, dev, dev);
 
+    assert(s->packet == p);
+    s->packet = NULL;
+
     if (s->req) {
         scsi_req_cancel(s->req);
     }