From b7947a0a6ec46a18efb1248612f32634b30c3f8d Mon Sep 17 00:00:00 2001
From: Vicki Pfau <vi@endrift.com>
Date: Sat, 5 Dec 2020 16:27:39 -0800
Subject: [PATCH] GBA BIOS: Add VBA LZ77 decompression bug compat in VBA bug
 compat mode

---
 src/gba/bios.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/gba/bios.c b/src/gba/bios.c
index e71be63e2..8dd28f197 100644
--- a/src/gba/bios.c
+++ b/src/gba/bios.c
@@ -664,6 +664,13 @@ static void _unLz77(struct GBA* gba, int width) {
 				while (bytes--) {
 					if (remaining) {
 						--remaining;
+					} else {
+						mLOG(GBA_BIOS, GAME_ERROR, "Improperly compressed LZ77 data at %08X. "
+						     "This will lead to a buffer overrun at %08X and may crash on hardware.",
+						     cpu->gprs[0], cpu->gprs[1]);
+						if (gba->vbaBugCompat) {
+							break;
+						}
 					}
 					if (width == 2) {
 						byte = (int16_t) cpu->memory.load16(cpu, disp & ~1, 0);