[5/6] ntdll: make NtWriteFile explicitly check for negative offset and fail.

[Dmitry Timoshkov]

Currently it relies on pwrite to fail if negative offset is passed.
---
 dlls/ntdll/file.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/dlls/ntdll/file.c b/dlls/ntdll/file.c
index b787f7f..c3d10cb 100644
--- a/dlls/ntdll/file.c
+++ b/dlls/ntdll/file.c
@@ -975,6 +975,11 @@ NTSTATUS WINAPI NtWriteFile(HANDLE hFile, HANDLE hEvent,
                 offset->QuadPart = lseek( unix_handle, 0, SEEK_END );
             else if (offset->QuadPart == (LONGLONG)-2 /* FILE_USE_FILE_POINTER_POSITION */)
                 offset->QuadPart = lseek( unix_handle, 0, SEEK_CUR );
+            else if (offset->QuadPart < 0)
+            {
+                status = STATUS_INVALID_PARAMETER;
+                goto done;
+            }
         }
         else
         {
-- 
1.8.3.4