MdeModulePkg/UsbBusPei: Fix out-of-bound read access to descriptors

[mirror_edk2.git] / MdeModulePkg / Bus / Usb / UsbBusPei / UsbPeim.h

diff --git a/MdeModulePkg/Bus/Usb/UsbBusPei/UsbPeim.h b/MdeModulePkg/Bus/Usb/UsbBusPei/UsbPeim.h
index 161097453717ea19a2a6f4a487617d29b0c50c53..14565deb46c59904d447bb6ace8cc33c3c713cba 100644 (file)
--- a/MdeModulePkg/Bus/Usb/UsbBusPei/UsbPeim.h
+++ b/MdeModulePkg/Bus/Usb/UsbBusPei/UsbPeim.h
@@ -33,6 +33,17 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 \r
 #include <IndustryStandard/Usb.h>\r
 \r
+//\r
+// A common header for usb standard descriptor.\r
+// Each stand descriptor has a length and type.\r
+//\r
+#pragma pack(1)\r
+typedef struct {\r
+  UINT8                   Len;\r
+  UINT8                   Type;\r
+} USB_DESC_HEAD;\r
+#pragma pack()\r
+\r
 #define MAX_INTERFACE             8\r
 #define MAX_ENDPOINT              16\r
 \r