Microsoft KB Archive/240740

= Overflow from NtGdiAddFontResourceW Returning Uninitialized Pool =

Article ID: 240740

Article Last Modified on 10/31/2006

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APPLIES TO


 * Microsoft Windows NT Server 4.0, Terminal Server Edition
 * Microsoft Windows NT Server 4.0 Standard Edition
 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Server 4.0 Enterprise Edition

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This article was previously published under Q240740



SYMPTOMS
When the NtGdiAddFontResourceW function call is started on your computer running Windows NT 4.0, the calling process may stop responding (hang) and an overflow error message may be returned to the user.



CAUSE
This behavior occurs because the string length needs to be limited to a smaller value.



Windows NT Server or Workstation 4.0
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or the individual software update. For information on obtaining the latest service pack, please go to:


 * http://www.microsoft.com/windows/servicepacks/ -or-


 * 152734how to obtain the latest windows nt 4.0 service pack

For information on obtaining the individual software update, contact Microsoft Product Support Services. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://support.microsoft.com/directory/overview.asp

The length of pwszFile has been changed to accommodate this requirement and to enable the processing of this routine without overflow.

Windows NT Server 4.0, Terminal Server Edition
To resolve this problem, obtain the latest service pack for Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

152734 How to Obtain the Latest Windows NT 4.0 Service Pack



STATUS
Microsoft has confirmed that this is a problem in Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition.

This problem was first corrected in Windows NT Server 4.0 Service Pack 6 and Windows NT Server 4.0, Terminal Server Edition Service Pack 6.



MORE INFORMATION
When the NtGdiAddFontResourceW function is started, a WCHAR pointer is passed from usermode. The routine then allocates a buffer and forwards the process to bCheckAndCapThePath. The bCheckAndCapThePath function calls cCapString to copy and uppercase the string, and cCapString uses RtlUpcaseUnicodeString to copy and uppercase the strings if it has the correct word buffer size. If the string length is greater than 32,767 bytes, the routine cannot start all of the output buffer and some of the pool may be returned as 'not started' and cause an overflow.

Additional query words: win32 subsystem

Keywords: kbbug kbfix kbprogramming KB240740

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