jbig2_sd_list_referred(Jbig2Ctx *ctx, Jbig2Segment *segment)
{
     int index;
     Jbig2Segment *rsegment;
     Jbig2SymbolDict **dicts;
    uint32_t n_dicts = jbig2_sd_count_referred(ctx, segment);
    uint32_t dindex = 0;
 
     dicts = jbig2_new(ctx, Jbig2SymbolDict *, n_dicts);
     if (dicts == NULL) {
        jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number, "failed to allocate referred list of symbol dictionaries");
        return NULL;
    }

    for (index = 0; index < segment->referred_to_segment_count; index++) {
        rsegment = jbig2_find_segment(ctx, segment->referred_to_segments[index]);
        if (rsegment && ((rsegment->flags & 63) == 0) && rsegment->result &&
                (((Jbig2SymbolDict *) rsegment->result)->n_symbols > 0) && ((*((Jbig2SymbolDict *) rsegment->result)->glyphs) != NULL)) {
            /* add this referred to symbol dictionary */
            dicts[dindex++] = (Jbig2SymbolDict *) rsegment->result;
        }
    }

    if (dindex != n_dicts) {
        /* should never happen */
        jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number, "counted %d symbol dictionaries but built a list with %d.\n", n_dicts, dindex);
    }

    return (dicts);
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.