[janderwald] 55945: [LIBUSB] - Check the device descriptor is valid - Implement function to return max packet size

Author: janderwald
Date: Thu Mar  1 15:51:59 2012
New Revision: 55945

URL: http://svn.reactos.org/svn/reactos?rev=55945&view=rev
Log:
[LIBUSB]
- Check the device descriptor is valid
- Implement function to return max packet size

Modified:
    trunk/reactos/lib/drivers/libusb/common_interfaces.h
    trunk/reactos/lib/drivers/libusb/usb_device.cpp

Modified: trunk/reactos/lib/drivers/libusb/common_interfaces.h
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/lib/drivers/libusb/common_…
==============================================================================
--- trunk/reactos/lib/drivers/libusb/common_interfaces.h [iso-8859-1] (original)
+++ trunk/reactos/lib/drivers/libusb/common_interfaces.h [iso-8859-1] Thu Mar  1 15:51:59
2012
@@ -664,6 +664,13 @@
 
     virtual NTSTATUS AbortPipe(IN PUSB_ENDPOINT_DESCRIPTOR EndpointDescriptor) = 0;
 
+//-----------------------------------------------------------------------------------------
+//
+// GetMaxPacketSize
+//
+// Description: aborts all pending requsts
+
+    virtual UCHAR GetMaxPacketSize() = 0;
 };
 
 typedef IUSBDevice *PUSBDEVICE;

Modified: trunk/reactos/lib/drivers/libusb/usb_device.cpp
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/lib/drivers/libusb/usb_dev…
==============================================================================
--- trunk/reactos/lib/drivers/libusb/usb_device.cpp [iso-8859-1] (original)
+++ trunk/reactos/lib/drivers/libusb/usb_device.cpp [iso-8859-1] Thu Mar  1 15:51:59 2012
@@ -54,6 +54,7 @@
     virtual NTSTATUS SelectConfiguration(IN PUSB_CONFIGURATION_DESCRIPTOR
ConfigurationDescriptor, IN PUSBD_INTERFACE_INFORMATION Interface, OUT
USBD_CONFIGURATION_HANDLE *ConfigurationHandle);
     virtual NTSTATUS SelectInterface(IN USBD_CONFIGURATION_HANDLE ConfigurationHandle, IN
OUT PUSBD_INTERFACE_INFORMATION Interface);
     virtual NTSTATUS AbortPipe(IN PUSB_ENDPOINT_DESCRIPTOR EndpointDescriptor);
+    virtual UCHAR GetMaxPacketSize();
 
 
     // local function
@@ -342,17 +343,30 @@
     // store new device address
     m_DeviceAddress = DeviceAddress;
 
-    // check that setting device address succeeded by retrieving the device descriptor
+    // fetch device descriptor
     Status = CreateDeviceDescriptor();
     if (!NT_SUCCESS(Status))
     {
+        DPRINT1("CUSBbDevice::SetDeviceAddress> failed to retrieve device
descriptor with device address set Error %x\n", Status);
+        // return error status
+        return Status;
+    }
+
+    // check for invalid device descriptor
+    if (m_DeviceDescriptor.bLength != sizeof(USB_DEVICE_DESCRIPTOR) ||
+        m_DeviceDescriptor.bDescriptorType != USB_DEVICE_DESCRIPTOR_TYPE ||
+        m_DeviceDescriptor.bNumConfigurations == 0)
+    {
         // failed to retrieve device descriptor
-        DPRINT1("CUSBbDevice::SetDeviceAddress> failed to retrieve device
descriptor with device address set Error %x\n", Status);
-        m_DeviceAddress = OldAddress;
+        DPRINT1("CUSBbDevice::SetDeviceAddress> device returned bogus device
descriptor\n");
+        DumpDeviceDescriptor(&m_DeviceDescriptor);
 
         // return error status
-        return Status;
-    }
+        return STATUS_UNSUCCESSFUL;
+    }
+
+    // dump device descriptor
+    DumpDeviceDescriptor(&m_DeviceDescriptor);
 
     // sanity checks
     PC_ASSERT(m_DeviceDescriptor.bNumConfigurations);
@@ -633,10 +647,9 @@
     if (NT_SUCCESS(Status))
     {
         //
-        // informal dbg print
+        // copy device descriptor
         //
         RtlCopyMemory(&m_DeviceDescriptor, Buffer, sizeof(USB_DEVICE_DESCRIPTOR));
-        DumpDeviceDescriptor(&m_DeviceDescriptor);
     }
 
     //
@@ -1211,6 +1224,12 @@
     return m_Queue->AbortDevicePipe(m_DeviceAddress, EndpointDescriptor);
 }
 
+UCHAR
+CUSBDevice::GetMaxPacketSize()
+{
+    return m_DeviceDescriptor.bMaxPacketSize0;
+}
+
 

//----------------------------------------------------------------------------------------
 NTSTATUS