FIX: Error message when you run an application that is configured to be built for the x64 platform by using the MSVCR90.dll file that calls the strncpy function: "An unhandled win32 exception occurred in 'application_name'"

Symptoms

You have an application that is configured to be built for an x64 platform by using the Msvcr90.dll file. The application calls the strncpy function. When you run the application, you may receive the following error message in the Visual Studio Just-In-Time Debugger window:

An unhandled win32 exception occured in 'application_name'

When you check the call stack, you may find an access violation was triggered in the Msvcr90.dll file and that the application stopped responding in the strncpy function. This problem occurs when the following conditions are true:

The source buffer extends to the end of an allocated page.
The next byte after this page does not belong to the running process.
The length to be copied is an even multiple of 8.
The length to be copied includes the final byte of the source buffer.

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Cause

This problem occurs because the strncpy function tries to access the next byte after the source buffer. This issue is introduced by new optimizations to some CRT library functions.

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Resolution

Hotfix information

A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Visual Studio 2008 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites

You must have Visual Studio 2008 Service Pack 1 installed to apply this hotfix.

Restart requirement

You do not have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

File name	File version	File size	Date	Time	Platform
Atl90.dll	9.0.30729.162	159,552	14-Oct-2008	02:32	x86
Mfc90.dll	9.0.30729.162	5,084,480	14-Oct-2008	01:12	x64
Mfc90.dll	9.0.30729.162	3,766,080	14-Oct-2008	02:32	x86
Mfc90chs.dll	9.0.30729.162	36,680	14-Oct-2008	01:12	x64
Mfc90chs.dll	9.0.30729.162	36,680	14-Oct-2008	02:32	x86
Mfc90cht.dll	9.0.30729.162	37,704	14-Oct-2008	01:12	x64
Mfc90cht.dll	9.0.30729.162	37,704	14-Oct-2008	02:32	x86
Mfc90d.dll	9.0.30729.162	7,419,200	14-Oct-2008	01:12	x64
Mfc90d.dll	9.0.30729.162	5,934,912	14-Oct-2008	02:32	x86
Mfc90deu.dll	9.0.30729.162	64,328	14-Oct-2008	01:12	x64
Mfc90deu.dll	9.0.30729.162	64,328	14-Oct-2008	02:32	x86
Mfc90enu.dll	9.0.30729.162	54,600	14-Oct-2008	01:12	x64
Mfc90enu.dll	9.0.30729.162	54,600	14-Oct-2008	02:32	x86
Mfc90esn.dll	9.0.30729.162	62,792	14-Oct-2008	01:12	x64
Mfc90esn.dll	9.0.30729.162	62,792	14-Oct-2008	02:32	x86
Mfc90esp.dll	9.0.30729.162	62,792	14-Oct-2008	01:12	x64
Mfc90esp.dll	9.0.30729.162	62,792	14-Oct-2008	02:32	x86
Mfc90fra.dll	9.0.30729.162	63,816	14-Oct-2008	01:12	x64
Mfc90fra.dll	9.0.30729.162	63,816	14-Oct-2008	02:32	x86
Mfc90ita.dll	9.0.30729.162	62,280	14-Oct-2008	01:12	x64
Mfc90ita.dll	9.0.30729.162	62,280	14-Oct-2008	02:32	x86
Mfc90jpn.dll	9.0.30729.162	44,360	14-Oct-2008	01:12	x64
Mfc90jpn.dll	9.0.30729.162	44,360	14-Oct-2008	02:32	x86
Mfc90kor.dll	9.0.30729.162	43,848	14-Oct-2008	01:12	x64
Mfc90kor.dll	9.0.30729.162	43,848	14-Oct-2008	02:32	x86
Mfc90u.dll	9.0.30729.162	5,103,424	14-Oct-2008	01:12	x64
Mfc90u.dll	9.0.30729.162	3,781,440	14-Oct-2008	02:32	x86
Mfc90ud.dll	9.0.30729.162	7,464,264	14-Oct-2008	01:12	x64
Mfc90ud.dll	9.0.30729.162	5,980,488	14-Oct-2008	02:32	x86
Mfcm90.dll	9.0.30729.162	67,072	14-Oct-2008	00:50	x64
Mfcm90.dll	9.0.30729.162	59,904	14-Oct-2008	00:20	x86
Mfcm90d.dll	9.0.30729.162	93,184	14-Oct-2008	00:50	x64
Mfcm90d.dll	9.0.30729.162	80,896	14-Oct-2008	00:20	x86
Mfcm90u.dll	9.0.30729.162	67,072	14-Oct-2008	00:50	x64
Mfcm90u.dll	9.0.30729.162	59,904	14-Oct-2008	00:20	x86
Mfcm90ud.dll	9.0.30729.162	93,696	14-Oct-2008	00:50	x64
Mfcm90ud.dll	9.0.30729.162	80,896	14-Oct-2008	00:20	x86
Mfcmifc80u.dll	9.0.30729.162	14,152	20-Oct-2008	17:19	x86
Microsoft.visualc.stlclr.dll	9.0.30729.162	49,000	20-Oct-2008	17:19	x86
Msvcm90.dll	9.0.30729.162	225,280	13-Oct-2008	21:59	x86
Msvcm90.dll	9.0.30729.162	324,096	13-Oct-2008	22:36	IA-64
Msvcm90.dll	9.0.30729.162	245,760	13-Oct-2008	23:40	x64
Msvcm90d.dll	9.0.30729.162	312,832	13-Oct-2008	21:59	x86
Msvcm90d.dll	9.0.30729.162	429,568	13-Oct-2008	22:37	IA-64
Msvcm90d.dll	9.0.30729.162	333,312	13-Oct-2008	23:40	x64
Msvcp90.dll	9.0.30729.162	1,467,208	14-Oct-2008	00:56	IA-64
Msvcp90.dll	9.0.30729.162	854,344	14-Oct-2008	01:12	x64
Msvcp90.dll	9.0.30729.162	570,696	14-Oct-2008	02:32	x86
Msvcp90d.dll	9.0.30729.162	2,514,760	14-Oct-2008	00:56	IA-64
Msvcp90d.dll	9.0.30729.162	1,121,608	14-Oct-2008	01:12	x64
Msvcp90d.dll	9.0.30729.162	873,288	14-Oct-2008	02:32	x86
Msvcr90.dll	9.0.30729.162	1,504,584	14-Oct-2008	00:56	IA-64
Msvcr90.dll	9.0.30729.162	624,456	14-Oct-2008	01:12	x64
Msvcr90.dll	9.0.30729.162	653,640	14-Oct-2008	02:32	x86
Msvcr90d.dll	9.0.30729.162	3,599,688	14-Oct-2008	00:56	IA-64
Msvcr90d.dll	9.0.30729.162	1,349,960	14-Oct-2008	01:12	x64
Msvcr90d.dll	9.0.30729.162	1,178,440	14-Oct-2008	02:32	x86
Vcomp90.dll	9.0.30729.162	142,664	14-Oct-2008	00:56	IA-64
Vcomp90.dll	9.0.30729.162	57,672	14-Oct-2008	01:12	x64
Vcomp90.dll	9.0.30729.162	52,040	14-Oct-2008	02:32	x86
Vcomp90d.dll	9.0.30729.162	317,256	14-Oct-2008	00:56	IA-64
Vcomp90d.dll	9.0.30729.162	105,800	14-Oct-2008	01:12	x64
Vcomp90d.dll	9.0.30729.162	89,416	14-Oct-2008	02:32	x86
Vcomp90ui.dll	9.0.30729.162	11,592	20-Oct-2008	17:19	x86
Vcredist_ia64.exe	9.0.30729.162	4,712,272	14-Oct-2008	19:32	x86
Vcredist_x64.exe	9.0.30729.162	5,236,560	14-Oct-2008	19:36	x86
Vcredist_x86.exe	9.0.30729.162	4,496,208	14-Oct-2008	19:28	x86

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Workaround

To work around this problem, use one of the following methods:

Change any of the four conditions that are described in the "Symptoms" section.
Replace the strncpy function with other functions that have the similar functionality, such as the memcpyfunction or the lstrcpyn function.

Note These copy functions are slightly different. For example, the memcpy function does not end the string copy when a null byte is encountered before the indicated length.

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Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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More Information

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

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Keywords: kbhotfixdev, kbnotautohotfix, kbfix, kbexpertiseadvanced, kbqfe, kbhotfixserver, kb

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Article Info

Article ID	:	956420
Revision	:	4
Created on	:	3/30/2017
Published on	:	3/30/2017
Exists online	:	False
Views	:	104

Microsoft KB Archive Search

FIX: Error message when you run an application that is configured to be built for the x64 platform by using the MSVCR90.dll file that calls the strncpy function: "An unhandled win32 exception occurred in 'application_name'"

Symptoms

Cause

Resolution

Hotfix information

Prerequisites

Restart requirement

Hotfix replacement information

File information

Workaround

Status

More Information