From: gameblabla <gameblabla@openmailbox.org>
Date: Mon, 22 Jul 2019 21:25:49 +0000 (+0200)
Subject: psxbios: Don't accept 400h as a valid sector.
X-Git-Tag: r23~156^2
X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1059caaf959bf28d2cd1020b8bc30d33fb71ed93;p=pcsx_rearmed.git

psxbios: Don't accept 400h as a valid sector.

Notaz said this could corrupt the emulator (even though
the console allowed this and it was a bug) so limit it to 0x3FF.
---

diff --git a/libpcsxcore/psxbios.c b/libpcsxcore/psxbios.c
index 8c8093b1..928f0af0 100644
--- a/libpcsxcore/psxbios.c
+++ b/libpcsxcore/psxbios.c
@@ -2450,8 +2450,11 @@ void psxBios__card_write() { // 0x4e
 #ifdef PSXBIOS_LOG
 	PSXBIOS_LOG("psxBios_%s: %x,%x,%x\n", biosB0n[0x4e], a0, a1, a2);
 #endif
-	/* Function also accepts sector 400h (a bug) */
-	if (!(a1 <= 0x400))
+	/*
+	Function also accepts sector 400h (a bug).
+	But notaz said we shouldn't allow sector 400h because it can corrupt the emulator.
+	*/
+	if (!(a1 <= 0x3FF))
 	{
 		/* Invalid sectors */
 		v0 = 0; pc0 = ra;
@@ -2483,8 +2486,11 @@ void psxBios__card_read() { // 0x4f
 #ifdef PSXBIOS_LOG
 	PSXBIOS_LOG("psxBios_%s\n", biosB0n[0x4f]);
 #endif
-	/* Function also accepts sector 400h (a bug) */
-	if (!(a1 <= 0x400))
+	/*
+	Function also accepts sector 400h (a bug).
+	But notaz said we shouldn't allow sector 400h because it can corrupt the emulator.
+	*/
+	if (!(a1 <= 0x3FF))
 	{
 		/* Invalid sectors */
 		v0 = 0; pc0 = ra;