AssertBCB DriverEntry Ext2AcqLazyWrite Ext2AcqReadAhead Ext2AddBlockToFile Ext2Align Ext2Align64 Ext2AllocateByteLocks Ext2AllocateCCB Ext2AllocateFCB Ext2AllocateIrpContext Ext2AllocateObjectName Ext2AllocBlock Ext2AllocInode Ext2Cleanup Ext2Close Ext2CloseClosableFCB Ext2CommonCleanup Ext2CommonClose Ext2CommonCreate Ext2CommonDeviceControl Ext2CommonDirControl Ext2CommonDispatch Ext2CommonFileInfo Ext2CommonFlush Ext2CommonRead Ext2CommonShutdown Ext2CommonWrite Ext2CompleteRequest Ext2CopyCharToUnicodeString Ext2CopyUnicodeString Ext2CopyWideCharToUnicodeString Ext2CopyZCharToUnicodeString Ext2Create Ext2CreateFile Ext2CreateNewCCB Ext2CreateNewFCB Ext2DeallocateUnicodeString Ext2DeallocBlock Ext2DeallocInode Ext2DeferredWriteCallBack Ext2DeleteFile Ext2DenyAccess Ext2DestroyZones Ext2DeviceControl Ext2DevIoctlCompletion Ext2DirControl Ext2ExceptionFilter Ext2ExceptionHandler Ext2FastIoAcqCreateSec Ext2FastIoCheckIfPossible Ext2FastIoLock Ext2FastIoQueryBasicInfo Ext2FastIoQueryStdInfo Ext2FastIoRead Ext2FastIoRelCreateSec Ext2FastIoUnlockAll Ext2FastIoUnlockAllByKey Ext2FastIoUnlockSingle Ext2FastIoWrite Ext2FileInfo Ext2FileSystemControl Ext2Flush Ext2FlushAFile Ext2FlushCompletion Ext2FlushLogicalVolume Ext2FlushSavedBCBs Ext2FreeDirectoryEntry Ext2FsdInitializeFunctionPointers Ext2GetBasicInformation Ext2GetCallersBuffer Ext2GetCurrentTime Ext2GetFCB_CCB_VCB_FromFileObject Ext2GetFullNameInformation Ext2GetNetworkOpenInformation Ext2GetStandardInformation Ext2GetUsedFCB Ext2HandleQueryPath Ext2InitializeFCB Ext2InitializeFCBInodeInfo Ext2InitializeVCB Ext2InitializeZones Ext2IsDirectoryEmpty Ext2IsIrpTopLevel Ext2LocateChildFCBInCore Ext2LocateFCBInCore Ext2LocateFileInDisk Ext2LockCallersBuffer Ext2LogEvent Ext2MakeNewDirectoryEntry Ext2MdlComplete Ext2MultiAsyncCompletionRoutine Ext2MultiSyncCompletionRoutine Ext2NotifyChangeDirectory Ext2OpenRootDirectory Ext2OpenVolume Ext2OverwriteFile Ext2PassDownMultiReadWriteIRP Ext2PassDownSingleReadWriteIRP Ext2PostRequest Ext2QueryDirectory Ext2QueryVolInfo Ext2QueueHandlerThread Ext2Read Ext2ReadInode Ext2ReadLogicalBlocks Ext2ReadPhysicalBlocks Ext2ReleaseByteLocks Ext2ReleaseCCB Ext2ReleaseDataBlocks Ext2ReleaseFCB Ext2ReleaseIrpContext Ext2ReleaseObjectName Ext2RelLazyWrite Ext2RelReadAhead Ext2RenameOrLinkFile Ext2SaveBCB Ext2SetAllocationInformation Ext2SetBasicInformation Ext2SetDispositionInformation Ext2SetVolInfo Ext2Shutdown Ext2SingleAsyncCompletionRoutine Ext2SingleSyncCompletionRoutine Ext2SupersedeFile Ext2TruncateFileAllocationSize Ext2UpdateFileSize Ext2VerifyVolume Ext2Write Ext2WriteInode Ext2ZerooutUnicodeString

NTSTATUS NTAPI Ext2LockCallersBuffer ( PIRP  PtrIrp, BOOLEAN  IsReadOperation, uint32  Length  ) Definition at line 1358 of file read.c. Referenced by Ext2CommonRead(), Ext2CommonWrite(), Ext2PassDownMultiReadWriteIRP(), Ext2PassDownSingleReadWriteIRP(), and Ext2QueryDirectory(). { NTSTATUS RC = STATUS_SUCCESS; PMDL PtrMdl = NULL; ASSERT(PtrIrp); try { // Is a MDL already present in the IRP if( !(PtrIrp->MdlAddress) ) { // Allocate a MDL if (!(PtrMdl = IoAllocateMdl(PtrIrp->UserBuffer, Length, FALSE, FALSE, PtrIrp))) { RC = STATUS_INSUFFICIENT_RESOURCES; try_return(); } // Probe and lock the pages described by the MDL // We could encounter an exception doing so, swallow the exception // NOTE: The exception could be due to an unexpected (from our // perspective), invalidation of the virtual addresses that comprise // the passed in buffer try { MmProbeAndLockPages(PtrMdl, PtrIrp->RequestorMode, (IsReadOperation ? IoWriteAccess:IoReadAccess)); } except(EXCEPTION_EXECUTE_HANDLER) { RC = STATUS_INVALID_USER_BUFFER; } } try_exit: NOTHING; } finally { if (!NT_SUCCESS(RC) && PtrMdl) { IoFreeMdl(PtrMdl); // You MUST NULL out the MdlAddress field in the IRP after freeing // the MDL, else the I/O Manager will also attempt to free the MDL // pointed to by that field during I/O completion. Obviously, the // pointer becomes invalid once you free the allocated MDL and hence // you will encounter a system crash during IRP completion. PtrIrp->MdlAddress = NULL; } } return(RC); }