DriverStudio Bug?? [Not From me,but A friend]

NTDEV
1

everwalking (BbSlOvEr) From DriverDev SMTH

The usb driver usbtest.sys generated by DS wizard can not be loaded, system
thread is always busy.
I trace it,and find the problem may be here below:
LocateInterface() in kusb.cpp:
…
…
PUSB_INTERFACE_DESCRIPTOR pDesc;
if ( *pStart == NULL )
*pStart = m_Config;
pDesc = USBD_ParseConfigurationDescriptorEx(,);// parameters
*pStart = &pDesc[1];
if (pDesc && pDesc->bNumEndpoints)
{
PUSB_ENDPOINT_DESCRIPTOR ped = (PUSB_ENDPOINT_DESCRIPTOR)&pDesc[1];

while ( ped->bDescriptorType != 5 ) // if not endpoint descriptor,go
on

{
ped = (PUSB_ENDPOINT_DESCRIPTOR) (ped->bLength +
(PCHAR)ped);
}
*ppEndpoints = ped;
}

if the interface desc is not 9 bytes,then it will trapped in a definite
loop.

2

Try xxxxx@compuware.com !

Alberto.

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com]On Behalf Of Ming
Sent: Tuesday, December 23, 2003 12:00 AM
To: Windows System Software Devs Interest List
Subject: [ntdev] DriverStudio Bug?? [Not From me,but A friend]

everwalking (BbSlOvEr) From DriverDev SMTH

The usb driver usbtest.sys generated by DS wizard can not be loaded, system
thread is always busy.
I trace it,and find the problem may be here below:
LocateInterface() in kusb.cpp:
…
…
PUSB_INTERFACE_DESCRIPTOR pDesc;
if ( *pStart == NULL )
*pStart = m_Config;
pDesc = USBD_ParseConfigurationDescriptorEx(,);// parameters
*pStart = &pDesc[1];
if (pDesc && pDesc->bNumEndpoints)
{
PUSB_ENDPOINT_DESCRIPTOR ped = (PUSB_ENDPOINT_DESCRIPTOR)&pDesc[1];

while ( ped->bDescriptorType != 5 ) // if not endpoint descriptor,go
on

{
ped = (PUSB_ENDPOINT_DESCRIPTOR) (ped->bLength +
(PCHAR)ped);
}
*ppEndpoints = ped;
}

if the interface desc is not 9 bytes,then it will trapped in a definite
loop.

Questions? First check the Kernel Driver FAQ at
http://www.osronline.com/article.cfm?id=256

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