MdlAfterReqCompletedIoctl rule (kmdf)

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

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

This rule looks at the following MDL access functions:

WDF_MEMORY_DESCRIPTOR_INIT_MDL

MmGetMdlByteCount

MmGetSystemAddressForMdlSafe

MmGetMdlVirtualAddress

IoBuildPartialMdl (first and second parameter)

KeFlushIoBuffers

MmGetMdlPfnArray

MmGetMdlByteOffset

MmPrepareMdlForReuse

WdfDmaTransactionInitialize

Driver modelKMDF

How to test

At compile time

Run Static Driver Verifier and specify the MdlAfterReqCompletedIoctl 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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