Microsoft KB Archive/260055

= Ohci1394 driver may cause a memory leak during asynchronous write operation =

Article ID: 260055

Article Last Modified on 9/26/2005

-

APPLIES TO


 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Professional Edition

-



This article was previously published under Q260055



SYMPTOMS
A memory leak in the nonpaged pool can be observed when a driver uses a REQUEST_ASYNC_WRITE request to perform an asynchronous write with certain parameters.



CAUSE
While doing an asynchronous write by using REQUEST_ASYNC_WRITE with the DestinationAddress member of the IRB set to 0xffff:0 or above and the nNumberOfBytesToWrite member set to 0x80 or above, the driver leaks nonpaged pool memory.

The Ohci1394.sys driver allocates direct memory access (DMA) resources to transfer the data. Normally these resources are released after the data transfer is complete. If the condition mentioned in the preceding paragraph is met, the Ohci1394.sys driver will not release the DMA resources.



RESOLUTION
To resolve this problem, obtain the latest service pack for Windows 2000. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

260910 How to obtain the latest Windows 2000 service pack

The English version of this fix should have the following file attributes or later:   Date        Time      Version        Size    File name -  04/24/2000  08:00 PM  5.0.2195.2064  36,848  Ohci1394.sys



STATUS
Microsoft has confirmed that this is a problem in Microsoft Windows 2000. This problem was first corrected in Windows 2000 Service Pack 2.



MORE INFORMATION
For more information about how to install Windows 2000 and Windows 2000 hotfixes at the same time, click the following article number to view the article in the Microsoft Knowledge Base:

249149 Installing Microsoft Windows 2000 and Windows 2000 hotfixes

Additional query words: IEEE 1394 ohci REQUEST_ASYNC_WRITE async write

Keywords: kbbug kbfix kbado260fix kbwin2000presp2fix kbqfe kboswin2000fix kbhotfixserver KB260055

-

[mailto:TECHNET@MICROSOFT.COM Send feedback to Microsoft]

© Microsoft Corporation. All rights reserved.