# HG changeset patch
# User Michael Pavone <pavone@retrodev.com>
# Date 1704168161 28800
# Node ID 8171409b62efe7e0e786b53a7eb091dcfb8ee805
# Parent  49b7ead35482df8f8bb45fa2a6825b6bac0089d7
Fix incorrect manipulation of lock-on cart memory map

diff -r 49b7ead35482 -r 8171409b62ef romdb.c
--- a/romdb.c	Mon Jan 01 19:50:20 2024 -0800
+++ b/romdb.c	Mon Jan 01 20:02:41 2024 -0800
@@ -862,9 +862,12 @@
 			*map = lock_info.map[i];
 			if (map->start < 0x200000) {
 				if (map->buffer) {
-					uint8_t *buf = map->buffer;
-					buf += (0x200000 - map->start) & ((map->flags & MMAP_AUX_BUFF) ? map->aux_mask : map->mask);
-					map->buffer = buf;
+					uint32_t mask = (map->flags & MMAP_AUX_BUFF) ? map->aux_mask : map->mask;
+					if (mask < 0x3FFFFF) {
+						uint8_t *buf = map->buffer;
+						buf += (0x200000 - map->start) & mask;
+						map->buffer = buf;
+					}
 				}
 				map->start = 0x200000;
 			}