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AVOID_UB: FileSelect_LoadGame out of bounds gBitFlags[-1] (#2527)

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Dragorn421 2025-05-12 13:25:22 +02:00 • committed by GitHub
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9
src/overlays/gamestates/ovl_file_choose/z_file_choose.c
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@ -1955,7 +1955,16 @@ void FileSelect_LoadGame(GameState* thisx) {
swordEquipValue =
(gEquipMasks[EQUIP_TYPE_SWORD] & gSaveContext.save.info.equips.equipment) >> (EQUIP_TYPE_SWORD * 4);
gSaveContext.save.info.equips.equipment &= gEquipNegMasks[EQUIP_TYPE_SWORD];
#ifndef AVOID_UB
//! @bug swordEquipValue can be 0 (EQUIP_VALUE_SWORD_NONE) here (typically, when first starting the game).
//! This leads to reading gBitFlags[-1] (out of bounds).
// gBitFlags[-1] turns out to be 0 in matching versions so this is inconsequential.
gSaveContext.save.info.inventory.equipment ^= OWNED_EQUIP_FLAG(EQUIP_TYPE_SWORD, swordEquipValue - 1);
#else
if (swordEquipValue != EQUIP_VALUE_SWORD_NONE) {
gSaveContext.save.info.inventory.equipment ^= OWNED_EQUIP_FLAG(EQUIP_TYPE_SWORD, swordEquipValue - 1);
}
#endif
}
#if PLATFORM_N64