From 2f25b5c1e87cf983be221a851ca593f3a2b0b90e Mon Sep 17 00:00:00 2001
From: Matt Harlum <matt@harlum.net>
Date: Wed, 22 Oct 2025 08:38:12 +0000
Subject: [PATCH] Fix emulated scsi read/write bounds check

This was off by one making the last sector inaccessible
---
 iotask.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/iotask.c b/iotask.c
index cad2c5c..176fff1 100644
--- a/iotask.c
+++ b/iotask.c
@@ -172,7 +172,7 @@ static BYTE handle_scsi_command(struct IOStdReq *ioreq) {
                 count = ((struct SCSI_CDB_16 *)command)->length; 
 
     do_scsi_transfer:
-                if (data == NULL || (lba + count) >= unit->logicalSectors) {
+                if (data == NULL || (lba + count) > unit->logicalSectors) {
                     error = IOERR_BADADDRESS;
                     fake_scsi_sense(scsi_command,lba,count,error);
                     break;
@@ -501,7 +501,7 @@ transfer:
             }
 
             if ((lba + count) > (unit->logicalSectors)) {
-                Trace("Read past end of device\n");
+                Trace("Access past end of device\n");
                 error  = IOERR_BADADDRESS;
                 break;
             }