Edit

BufAfterReqCompletedIoctl rule (kmdf)

  • Article

The BufAfterReqCompletedIoctl rule specifies that within the EvtIoDeviceControl callback function, the I/O request buffer retrieved cannot be accessed after the I/O request is completed.

Within the driver's EvtIoDeviceControl callback function, the request buffer that was retrieved by calling WdfRequestRetrieveInputBuffer, WdfRequestRetrieveOutputBuffer, WdfRequestRetrieveUnsafeUserInputBuffer, or WdfRequestRetrieveUnsafeUserOutputBuffer cannot be accessed after calling WdfRequestComplete, WdfRequestCompleteWithInformation, or WdfRequestCompleteWithPriorityBoost on the I/O request.

This rule considers the following buffer access methods:

Driver model: KMDF

How to test

At compile time

Run Static Driver Verifier and specify the BufAfterReqCompletedIoctl rule.

Use the following steps to run an analysis of your code:
  1. Prepare your code (use role type declarations).
  2. Run Static Driver Verifier.
  3. View and analyze the results.

For more information, see Using Static Driver Verifier to Find Defects in Drivers.

Applies to

WdfRequestComplete WdfRequestCompleteWithInformation WdfRequestCompleteWithPriorityBoost WdfRequestRetrieveInputBuffer WdfRequestRetrieveOutputBuffer WdfRequestRetrieveUnsafeUserInputBuffer WdfRequestRetrieveUnsafeUserOutputBuffer

See also

BufAfterReqCompletedIoctlA