W32N_MakeNdisRequest 512-Byte
InformationBuffer Size Limitation

Knowledge Base ID	KB10160001
Category	CLOSED BUG
Effected Product	Rawether/WINDIS32 - Win32 NDIS Framework
Effected Versions	V5.00.13.46 and prior.
Effected Platforms	Windows NT, Windows 2000

Symptoms

A W32N_MakeNdisRequest call will fail if the InformationBufferLength was greater than 512 bytes. This limitation is only encountered on Windows NT and Windows 2000 platforms.

Cause

Rawether provides a W32N_REQUEST structure that is used to pass the user-mode NDIS_REQUEST to the PCANDIS driver. On version V5.00.13.46 and prior, the internal W32N_MakeNdisRequest function implementation used a fixed-size (512-byte) RequestBuffer to pass the InformationBuffer to the NT driver. Calls with an InformationBufferSize greater then the size of fixed-size RequestBuffer would fail.

Resolution

Rawether version V5.00.13.47 and higher no longer rely on the fixed-size Request buffer. Instead, the user-mode InformationBuffer is probed and locked by the PCANDIS driver.

Status

September 25, 2000

Fix provided in V5.00.13.47.

Keywords	RAWETHER,WINDIS32, NDIS_REQUEST, BUG
Created	October 16, 2000
Last Reviewed	October 16, 2000

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