FIX: Malformed RPC TDS Packet Causes Various AVs

ID: Q246612

The information in this article applies to:

Microsoft SQL Server version 7.0

BUG #: 56866 (SQLBUG_70)

SYMPTOMS

Under rare conditions a malformed Tabular Data Stream (TDS) packet, which is submitted using Remote Procedure Call (RPC) protocol, can cause various Access Violations (AVs). The AV may result in a server shutdown if it occurs within the Open Data Services (ODS) layer. If occurring outside of ODS, the AV may cause instability that results in a server hang.

The cause of the malformed packet is usually network-layer factors such as the Network Interface Card (NIC), NIC device driver, or network router. Much less frequently it might be caused by a bug in the ODBC, OLE-DB, or DB-Library client libraries.

This hotfix improves the server-side robustness for handling these malformed packets. In some situations (but not all) it will avoid the AV. Instead you may see error 17805:

Invalid buffer received from client.

RESOLUTION

A supported fix that corrects this problem is now available from Microsoft, but it has not been fully regression tested and should be applied only to systems experiencing this specific problem. If you are not severely affected by this specific problem, Microsoft recommends that you wait for the next SQL Server service pack that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. 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://www.microsoft.com/support/supportnet/overview/overview.asp

The English version of this fix should have the following file attributes or later:


   Date        Time     Version    Size     File name      Platform
   ----------------------------------------------------------------

  11/16/1999   11:52a   7.00.751   408,950   S70751A.exe   Alpha
  11/16/1999   11:51a   7.00.751   276,094   S70751I.exe   Intel

NOTE: Due to file dependencies, the most recent hotfix or feature that contains the above files may also contain additional files.

STATUS

Microsoft has confirmed this to be a problem in SQL Server version 7.0.

REFERENCES

For additional information on Tabular Data Stream (TDS), Remote Procedure Call (RPC) and Open Data Services (ODS), see SQL Server Books Online.

Additional query words:

Keywords : kbSQLServ700bug
Version : winnt:7.0
Platform : winnt
Issue type : kbbug