[PATCH] hw/cxl: Fix missing reserved data in CXL Device DVSEC

[Jonathan Cameron]

The r3.1 specification introduced a new 2 byte field, but
to maintain DWORD alignment, a additional 2 reserved bytes
were added. Forgot those in updating the structure definition
but did include them in the size define leading to a buffer
overrun.

Also use the define so that we don't duplicate the value.

Fixes: Coverity ID 1534095 buffer overrun
Fixes: 8700ee15de ("hw/cxl: Standardize all references on CXL r3.1 and minor 
updates")
Reported-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 include/hw/cxl/cxl_pci.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/hw/cxl/cxl_pci.h b/include/hw/cxl/cxl_pci.h
index 265db6c407..d0855ed78b 100644
--- a/include/hw/cxl/cxl_pci.h
+++ b/include/hw/cxl/cxl_pci.h
@@ -92,8 +92,9 @@ typedef struct CXLDVSECDevice {
     uint32_t range2_base_hi;
     uint32_t range2_base_lo;
     uint16_t cap3;
+    uint16_t resv;
 } QEMU_PACKED CXLDVSECDevice;
-QEMU_BUILD_BUG_ON(sizeof(CXLDVSECDevice) != 0x3A);
+QEMU_BUILD_BUG_ON(sizeof(CXLDVSECDevice) != PCIE_CXL_DEVICE_DVSEC_LENGTH);
 
 /*
  * CXL r3.1 Section 8.1.5: CXL Extensions DVSEC for Ports
-- 
2.39.2