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

[reactos.git] / ntoskrnl / fsrtl / name.c

diff --git a/ntoskrnl/fsrtl/name.c b/ntoskrnl/fsrtl/name.c
index ef760c3..3d2b33e 100644 (file)
--- a/ntoskrnl/fsrtl/name.c
+++ b/ntoskrnl/fsrtl/name.c
@@ -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,