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[PULL 10/10] usb-storage: tag usb_msd_csw as packed struct

From: Gerd Hoffmann
Subject: [PULL 10/10] usb-storage: tag usb_msd_csw as packed struct
Date: Tue, 2 Nov 2021 17:26:19 +0100

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

Cc: vintagepc404@protonmail.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Fixes: a917d384ac0 ("SCSI TCQ support.")
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20210906045523.1259629-1-kraxel@redhat.com>
 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;

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