From 6799b24730e2f3ded9ad3d5cebddab8f569454f7 Mon Sep 17 00:00:00 2001
From: Balint Kovacs <dratini0@gmail.com>
Date: Mon, 29 Mar 2021 00:44:40 +0100
Subject: [PATCH] Fix a bug on 512B EEPROM saves

Fixes #690
---
 arm9/source/gamecart/card_spi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arm9/source/gamecart/card_spi.c b/arm9/source/gamecart/card_spi.c
index f3ec65a..964d83b 100644
--- a/arm9/source/gamecart/card_spi.c
+++ b/arm9/source/gamecart/card_spi.c
@@ -307,7 +307,7 @@ int CardSPIReadSaveData_9bit(CardSPIType type, u32 pos, void* data, u32 size) {
 
     u32 read = 0;
     if (pos < 0x100) {
-        u32 len = 0x100 - pos;
+        u32 len = min(0x100 - pos, size);
         cmd[0] = SPI_512B_EEPROM_CMD_RDLO;
         cmd[1] = (u8) pos;
 
@@ -318,7 +318,7 @@ int CardSPIReadSaveData_9bit(CardSPIType type, u32 pos, void* data, u32 size) {
     }
 
     if (end >= 0x100) {
-        u32 len = end - 0x100;
+        u32 len = min(end - 0x100, size);
 
         cmd[0] = SPI_512B_EEPROM_CMD_RDHI;
         cmd[1] = (u8)(pos + read);