Without this the struct has the wrong size: sizeof() evaluates
to 16 instead of 13. In most cases the bug is hidden by the
fact that guests submits a buffer which is exactly 13 bytes
long, so the padding added by the compiler is simply ignored.
But sometimes guests submit a larger buffer and expect a short
transfer, which does not work properly with the wrong struct
size.
Cc: vintagepc404@xxxxxxxxxxxxxx
Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
Fixes: a917d384ac0 ("SCSI TCQ support.")
Reviewed-by: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
Message-Id: <20210906045523.1259629-1-kraxel@xxxxxxxxxx>
---
include/hw/usb/msd.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/hw/usb/msd.h b/include/hw/usb/msd.h
index 7538c54569bf..54e9f38bda46 100644
--- a/include/hw/usb/msd.h
+++ b/include/hw/usb/msd.h
@@ -17,7 +17,7 @@ enum USBMSDMode {
USB_MSDM_CSW /* Command Status. */
};
-struct usb_msd_csw {
+struct QEMU_PACKED usb_msd_csw {
uint32_t sig;
uint32_t tag;
uint32_t residue;
--
2.31.1
