ASIC MMC3: guard against possible bounds violation

2026-03-10 16:38:09 +01:00
parent 214ca70727
commit f9ab64ae0d
1 changed files with 2 additions and 0 deletions
--- a/src/boards/asic_mmc3.c
+++ b/src/boards/asic_mmc3.c
@@ -53,11 +53,13 @@ void MMC3_syncWRAM (int OR) {
 }

 int MMC3_getPRGBank (uint8 bank) {
+	bank &= 3;
 	if (MMC3_index &0x40 && ~bank &1) bank ^= 2;
 	return bank &2? 0xFE | bank &1: MMC3_reg[6 | bank &1];
 }

 int MMC3_getCHRBank (uint8 bank) {
+	bank &= 7;
 	if (MMC3_index &0x80) bank ^= 4;
 	return bank &4? MMC3_reg[bank -2]: MMC3_reg[bank >>1] &~1 | bank &1;
 }