From 01724d23d3e65e6ca12f3800d79c7de6ec241ea2 Mon Sep 17 00:00:00 2001
From: gameblabla
Date: Thu, 18 Jul 2019 02:15:27 +0200
Subject: psxbios: Add checks for bzero.

Only return 0 if size is invalid. (0 or 0x7FFFFFFF), return dst if not.
---
 libpcsxcore/psxbios.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/libpcsxcore/psxbios.c b/libpcsxcore/psxbios.c
index 4019234..c362a75 100644
--- a/libpcsxcore/psxbios.c
+++ b/libpcsxcore/psxbios.c
@@ -752,7 +752,21 @@ void psxBios_bcopy() { // 0x27
 
 void psxBios_bzero() { // 0x28
 	char *p = (char *)Ra0;
+	v0 = a0;
+	/* Same as memset here (See memset below) */
+	if (a1 > 0x7FFFFFFF || a1 == 0)
+	{
+		v0 = 0;
+		pc0 = ra;
+		return;
+	}
+	else if (a0 == 0)
+	{
+		pc0 = ra;
+		return;
+	}
 	while ((s32)a1-- > 0) *p++ = '\0';
+	a1 = 0;
 	pc0 = ra;
 }
 
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