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-rw-r--r--hw/usb-msd.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/hw/usb-msd.c b/hw/usb-msd.c
index c3a197a10c..1064920ac5 100644
--- a/hw/usb-msd.c
+++ b/hw/usb-msd.c
@@ -253,7 +253,7 @@ static void usb_msd_command_complete(SCSIBus *bus, int reason, uint32_t tag,
s->scsi_buf = s->scsi_dev->info->get_buf(s->scsi_dev, tag);
if (p) {
usb_msd_copy_data(s);
- if (s->usb_len == 0) {
+ if (s->packet && s->usb_len == 0) {
/* Set s->packet to NULL before calling usb_packet_complete
because another request may be issued before
usb_packet_complete returns. */