From 9db17294da97286e67d159d161c455961b2019c1 Mon Sep 17 00:00:00 2001
From: Bill Zissimopoulos <billziss@navimatics.com>
Date: Wed, 21 Aug 2024 11:29:37 +0100
Subject: [PATCH] sys: FspFsvolQueryDirectoryCopyCache: check DirInfoCacheHint
 against DirInfoSize

---
 src/sys/dirctl.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/sys/dirctl.c b/src/sys/dirctl.c
index 6216580b..a53ebc1c 100644
--- a/src/sys/dirctl.c
+++ b/src/sys/dirctl.c
@@ -348,7 +348,9 @@ static NTSTATUS FspFsvolQueryDirectoryCopyCache(
 
     FSP_FILE_NODE *FileNode = FileDesc->FileNode;
 
-    if (ResetCache || FileDesc->DirInfo != FileNode->NonPaged->DirInfo)
+    if (ResetCache ||
+        FileDesc->DirInfo != FileNode->NonPaged->DirInfo ||
+        FileDesc->DirInfoCacheHint >= DirInfoSize)
         FileDesc->DirInfoCacheHint = 0; /* reset the DirInfo hint if anything looks fishy! */
 
     FileDesc->DirInfo = FileNode->NonPaged->DirInfo;