#fixed code
                                public byte[] getViewIndexIdFromIndexRowKey(ImmutableBytesWritable indexRowKeyPtr) {
        assert (isLocalIndex);
        ImmutableBytesPtr ptr =
                new ImmutableBytesPtr(indexRowKeyPtr.get(),( indexRowKeyPtr.getOffset()
                        + (nIndexSaltBuckets > 0 ? 1 : 0)), viewIndexId.length);
        return ptr.copyBytesIfNecessary();
    }
#vulnerable code 
                                public byte[] getViewIndexIdFromIndexRowKey(ImmutableBytesWritable indexRowKeyPtr) {
        assert(isLocalIndex);
        RowKeySchema indexRowKeySchema = getIndexRowKeySchema();
        // TODO add logic to skip region start key as well because we cannot find the region startkey in indexhalfstorefilereader.
        ImmutableBytesWritable ptr = new ImmutableBytesWritable();
        TrustedByteArrayOutputStream stream =
                new TrustedByteArrayOutputStream(estimatedIndexRowKeyBytes);
        DataOutput output = new DataOutputStream(stream);
        try {
            int indexPosOffset = (!isLocalIndex && nIndexSaltBuckets > 0 ? 1 : 0) + (isMultiTenant ? 1 : 0) + (viewIndexId == null ? 0 : 1);
            Boolean hasValue =
                    indexRowKeySchema.iterator(indexRowKeyPtr, ptr, indexPosOffset);
            if (Boolean.TRUE.equals(hasValue)) {
                    output.write(ptr.get(), ptr.getOffset(), ptr.getLength());
            }
            int length = stream.size();
            byte[] dataRowKey = stream.getBuffer();
            return dataRowKey.length == length ? dataRowKey : Arrays.copyOf(dataRowKey, length);
        } catch (IOException e) {
            throw new RuntimeException(e); // Impossible
        } finally {
            try {
                stream.close();
            } catch (IOException e) {
                throw new RuntimeException(e); // Impossible
            }
        }
    } 
                            #location 18 
                            #vulnerability type NULL_DEREFERENCE