#vulnerable code 
                                @Override
    public int peekVolatileInt() {
        readCheckOffset(readPosition, 4, true);
        MappedBytesStore bytesStore = (MappedBytesStore) (BytesStore) this.bytesStore;
        long address = bytesStore.address + bytesStore.translate(readPosition);
        Memory memory = bytesStore.memory;
        for (int i = 0; i < 128; i++) {
            int value = memory.readVolatileInt(address);
            if (value != 0)
                return value;
        }
        return 0;
    } 
                            #location 8 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                @Override
    public int peekVolatileInt() {
        if (!bytesStore.inside(readPosition)) {
            acquireNextByteStore(readPosition);
        }

        MappedBytesStore bytesStore = (MappedBytesStore) (BytesStore) this.bytesStore;
        long address = bytesStore.address + bytesStore.translate(readPosition);
        Memory memory = bytesStore.memory;

        // are we inside a cache line?
        if ((address & 63) <= 60) {
            if (memory == null)
                throw new NullPointerException();

            for (int i = 0; i < 64; i++) {
                int value = UnsafeMemory.UNSAFE.getIntVolatile(null, address);
                if (value != 0 && value != 0x80000000)
                    return value;
            }
        } else {
            for (int i = 0; i < 32; i++) {
                int value = memory.readVolatileInt(address);
                if (value != 0)
                    return value;
            }
        }
        return 0;
    }