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67 lines
1.9 KiB
C++
67 lines
1.9 KiB
C++
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//
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// Copyright (C) Microsoft. All rights reserved.
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//
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#include "FxSupportPch.hpp"
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extern "C" {
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#if defined(EVENT_TRACING)
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#include "FxRegKey.tmh"
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#endif
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}
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_Must_inspect_result_
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NTSTATUS
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FxRegKey::_VerifyMultiSzString(
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__in PFX_DRIVER_GLOBALS FxDriverGlobals,
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__in PCUNICODE_STRING RegValueName,
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__in_bcount(DataLength) PWCHAR DataString,
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__in ULONG DataLength
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)
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/*++
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Routine Description:
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This static function checks the input buffer to verify that it contains
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a multi-sz string with a double-NULL termination at the end of the buffer.
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Arguments:
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DataString - buffer containing multi-sz strings. If there are no strings
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in the buffer, the buffer should at least contain two UNICODE_NULL
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characters.
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DataLength - the size in bytes of the input buffer.
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Return Value:
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STATUS_OBJECT_TYPE_MISMATCH - if the the data buffer is off odd-length,
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or it doesnt end with two UNICODE_NULL characters.
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STATUS_SUCCESS - if the buffer contains valid multi-sz strings.
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--*/
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{
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ULONG numChars;
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if ((DataLength % 2) != 0) {
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DoTraceLevelMessage(
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FxDriverGlobals, TRACE_LEVEL_ERROR, TRACINGERROR,
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"Reg value name %wZ, DataLength %d, Data buffer length is invalid, "
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"STATUS_OBJECT_TYPE_MISMATCH",
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RegValueName, DataLength);
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return STATUS_OBJECT_TYPE_MISMATCH;
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}
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numChars = DataLength / sizeof(WCHAR);
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if (numChars < 2 ||
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DataString[numChars-1] != UNICODE_NULL ||
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DataString[numChars-2] != UNICODE_NULL) {
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DoTraceLevelMessage(
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FxDriverGlobals, TRACE_LEVEL_ERROR, TRACINGERROR,
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"Read value name %wZ, DataLength %d, Data buffer from registry does not "
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"have double NULL terminal chars, STATUS_OBJECT_TYPE_MISMATCH",
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RegValueName, DataLength);
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return STATUS_OBJECT_TYPE_MISMATCH;
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}
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return STATUS_SUCCESS;
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}
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