[RFC: PATCH 3/5] Fix Length calculation in PdoQueryId

[Owen Smith <owen.smith@xxxxxxxxx>]

Decrease Length by the string length of the current ID before moving
the Buffer value to the end of the current ID. Without this, Length
is not decreased, leading to potential issues with the next call to
RtlStringCbPrintfW.

Signed-off-by: Owen Smith <owen.smith@xxxxxxxxx>
---
 src/xenvif/pdo.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/xenvif/pdo.c b/src/xenvif/pdo.c
index 1d163c9..d43702e 100644
--- a/src/xenvif/pdo.c
+++ b/src/xenvif/pdo.c
@@ -2100,11 +2100,11 @@ PdoQueryId(
                                         Revision->Number);
             ASSERT(NT_SUCCESS(status));
 
-            Buffer += wcslen(Buffer);
             Length -= (ULONG)(wcslen(Buffer) * sizeof (WCHAR));
+            Buffer += wcslen(Buffer);
 
-            Buffer++;
             Length -= sizeof (WCHAR);
+            Buffer++;
 
             --Index;
         }
-- 
2.41.0.windows.3