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MdlAfterReqCompletedRead rule (kmdf)

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

Within the driver's EvtIoRead callback function, the request buffer that was retrieved by calling the WdfRequestRetrieveOutputWdmMdl method cannot be accessed after calling WdfRequestComplete, WdfRequestCompleteWithInformation, or WdfRequestCompleteWithPriorityBoost on the I/O request.

This rule considers the following two methods:

WdfRequestRetrieveOutputWdmMdl

WdfRequestRetrieveInputWdmMdl

Driver modelKMDF

How to test

At compile time

Run Static Driver Verifier and specify the MdlAfterReqCompletedRead 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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