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[NTOSKRNL] Unify buffer size calculation in FsRtlIs{Name,Dbcs}InExpression

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It better captures the intent now in FsRtlIsNameInExpressionPrivate and
fixes a slight overallotion by 4 bytes in FsRtlIsDbcsInExpression.

While at it, use the ANSI_DOS_DOT macro in the Dbcs version.

CORE-15902
This commit is contained in:
Bartosz Brachaczek
2019-04-01 01:58:21 +02:00
committed by Pierre Schweitzer
parent 6eadbfb7e7
commit 695e00fbbd
2 changed files with 3 additions and 3 deletions
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4
ntoskrnl/fsrtl/dbcsname.c
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@@ -291,7 +291,7 @@ FsRtlIsDbcsInExpression(IN PANSI_STRING Expression,
ASSERT((OldBackTracking == BackTrackingBuffer) || (OldBackTracking == OldBackTrackingBuffer));
/* Calculate buffer size */
BackTrackingBufferSize = (Expression->Length + 1) * 2;
BackTrackingBufferSize = Expression->Length * 2 + 1;
/* Allocate memory for both back-tracking buffers */
AllocatedBuffer = ExAllocatePoolWithTag(PagedPool | POOL_RAISE_IF_ALLOCATION_FAILURE,
@@ -386,7 +386,7 @@ FsRtlIsDbcsInExpression(IN PANSI_STRING Expression,
continue;
}
/* Check DOS_DOT */
else if (ExpressionChar == DOS_DOT)
else if (ExpressionChar == ANSI_DOS_DOT)
{
if (EndOfName) continue;

2
ntoskrnl/fsrtl/name.c
View File

@@ -143,7 +143,7 @@ FsRtlIsNameInExpressionPrivate(IN PUNICODE_STRING Expression,
ASSERT((OldBackTracking == BackTrackingBuffer) || (OldBackTracking == OldBackTrackingBuffer));
/* Calculate buffer size */
BackTrackingBufferSize = Expression->Length + 1;
BackTrackingBufferSize = Expression->Length / sizeof(WCHAR) * 2 + 1;
/* Allocate memory for both back-tracking buffers */
AllocatedBuffer = ExAllocatePoolWithTag(PagedPool | POOL_RAISE_IF_ALLOCATION_FAILURE,