[reactos] 01/01: [NTOS:MM] Properly handle the 1-offset of paging files

[Jérôme Gardou]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=857dd4ae36a55f8dcf122d...

commit 857dd4ae36a55f8dcf122d904ee6993199909d8a
Author:     Jérôme Gardou [e-mail]
AuthorDate: Mon Dec 7 10:22:28 2020 +0100
Commit:     Jérôme Gardou [e-mail]
CommitDate: Tue Feb 2 10:17:28 2021 +0100

[NTOS:MM] Properly handle the 1-offset of paging files
---
 ntoskrnl/mm/pagefile.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/ntoskrnl/mm/pagefile.c b/ntoskrnl/mm/pagefile.c
index b7d8c83e54e..37870520998 100644
--- a/ntoskrnl/mm/pagefile.c
+++ b/ntoskrnl/mm/pagefile.c
@@ -189,7 +189,7 @@ NTSTATUS
 NTAPI
 MmReadFromSwapPage(SWAPENTRY SwapEntry, PFN_NUMBER Page)
 {
-    return MiReadPageFile(Page, FILE_FROM_ENTRY(SwapEntry), OFFSET_FROM_ENTRY(SwapEntry) - 1);
+    return MiReadPageFile(Page, FILE_FROM_ENTRY(SwapEntry), OFFSET_FROM_ENTRY(SwapEntry));
 }

NTSTATUS
@@ -215,6 +215,9 @@ MiReadPageFile(
         return(STATUS_UNSUCCESSFUL);
     }

+    /* Normalize offset. */
+    PageFileOffset--;
+
     ASSERT(PageFileIndex < MAX_PAGING_FILES);

PagingFile = MmPagingFile[PageFileIndex];