MdlAfterReqCompletedWrite rule (kmdf)

The MdlAfterReqCompletedWrite rule specifies that within the EvtIoWrite callback function, the memory descriptor list (MDL) object retrieved cannot be accessed after the I/O request is completed.

Within the driver's EvtIoWrite callback function for a device's I/O queue, the request buffer that was retrieved by calling the WdfRequestRetrieveInputWdmMdl method cannot be accessed after calling WdfRequestComplete, WdfRequestCompleteWithInformation, or WdfRequestCompleteWithPriorityBoost on the I/O request.

This rule considers the following two MDL access methods:

WdfRequestRetrieveOutputWdmMdl

WdfRequestRetrieveInputWdmMdl

Driver modelKMDF

How to test

At compile time

Run Static Driver Verifier and specify the MdlAfterReqCompletedWrite 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
WdfRequestRetrieveInputWdmMdl
WdfRequestRetrieveOutputWdmMdl

 

 

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