Fix the issue that null pointer may be dereferenced at SourceLevelDebugPkg

Signed-off-by: erictian
Reviewed-by: ydong10

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12389 6f19259b-4bc3-4df7-8a09-765794883524

1 files changed, 7 insertions, 5 deletions

diff --git a/SourceLevelDebugPkg/Library/DebugCommunicationLibUsb/DebugCommunicationLibUsb.c b/SourceLevelDebugPkg/Library/DebugCommunicationLibUsb/DebugCommunicationLibUsb.c
index 588e45853..59189db0d 100644
--- a/SourceLevelDebugPkg/Library/DebugCommunicationLibUsb/DebugCommunicationLibUsb.c
+++ b/SourceLevelDebugPkg/Library/DebugCommunicationLibUsb/DebugCommunicationLibUsb.c
@@ -1,7 +1,7 @@
 /** @file

   Debug Port Library implementation based on usb debug port.

 

-  Copyright (c) 2010, Intel Corporation. All rights reserved.<BR>

+  Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>

   This program and the accompanying materials

   are licensed and made available under the terms and conditions of the BSD License

   which accompanies this distribution.  The full text of the license may be found at

@@ -285,6 +285,7 @@ UsbDebugPortIn (
   }

 

   *Length = (UINT8)(MmioRead32((UINTN)&DebugPortRegister->ControlStatus) & 0xF);

+  ASSERT (*Length <= 8);

   for (Index = 0; Index < *Length; Index++) {

     Buffer[Index] = DebugPortRegister->DataBuffer[Index];

   }

@@ -402,6 +403,7 @@ UsbDebugPortControlTransfer (
 {

   RETURN_STATUS          Status;

   UINT8                  Temp;

+  UINT8                  ReturnStatus[8];

 

   //

   // Setup Phase

@@ -414,7 +416,7 @@ UsbDebugPortControlTransfer (
   //

   // Data Phase

   //

-  if (SetupPacket->Length != 0) {

+  if (DataLength != 0) {

     if ((SetupPacket->RequestType & BIT7) != 0) {

       //

       // Get Data From Device

@@ -446,7 +448,7 @@ UsbDebugPortControlTransfer (
     //

     // For WRITE operation, Data Toggle in Status Phase Should be 1.

     //

-    Status = UsbDebugPortIn(DebugPortRegister, NULL, &Temp, INPUT_PID, Addr, Ep, 1);

+    Status = UsbDebugPortIn(DebugPortRegister, ReturnStatus, &Temp, INPUT_PID, Addr, Ep, 1);

   }

 

   return Status;

@@ -641,11 +643,11 @@ InitializeUsbDebugHardware (
     //

     return Status;

   }

-

+  ASSERT (Length == sizeof(USB_DEBUG_PORT_DESCRIPTOR));

   //

   // set usb debug device address as 0x7F.

   //

-  Status = UsbDebugPortControlTransfer (UsbDebugPortRegister, &mSetDebugAddress, 0x0, 0x0, (UINT8*)&UsbDebugPortDescriptor, &Length);

+  Status = UsbDebugPortControlTransfer (UsbDebugPortRegister, &mSetDebugAddress, 0x0, 0x0, NULL, NULL);

   if (RETURN_ERROR(Status)) {

     //

     // The device can not work well.