[PATCH] usb/storage: clear csw on reset

[Gerd Hoffmann]

Stale data in csw (specifically residue) can confuse the state machine
and allows the guest trigger an assert().  So clear csw on reset to
avoid this happening in case the guest resets the device in the middle
of a request.

Buglink: https://bugs.launchpad.net/qemu/+bug/1523811
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/usb/dev-storage.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/usb/dev-storage.c b/hw/usb/dev-storage.c
index a5f76fc00120..fd4ea818115c 100644
--- a/hw/usb/dev-storage.c
+++ b/hw/usb/dev-storage.c
@@ -352,6 +352,7 @@ static void usb_msd_handle_reset(USBDevice *dev)
         usb_msd_packet_complete(s);
     }
 
+    memset(&s->csw, 0, sizeof(s->csw));
     s->mode = USB_MSDM_CBW;
 }
 
-- 
2.29.2