jbig2_free_segment(Jbig2Ctx *ctx, Jbig2Segment *segment)
{
    if (segment->referred_to_segments != NULL) {
        jbig2_free(ctx->allocator, segment->referred_to_segments);
    }
    /* todo: we need either some separate fields or
       a more complex result object rather than this
       brittle special casing */
    switch (segment->flags & 63) {
    case 0:                    /* symbol dictionary */
        if (segment->result != NULL)
            jbig2_sd_release(ctx, (Jbig2SymbolDict *) segment->result);
        break;
    case 4:                    /* intermediate text region */
    case 40:                   /* intermediate refinement region */
        if (segment->result != NULL)
            jbig2_image_release(ctx, (Jbig2Image *) segment->result);
        break;
    case 16:                   /* pattern dictionary */
        if (segment->result != NULL)
            jbig2_hd_release(ctx, (Jbig2PatternDict *) segment->result);
        break;
    case 53:                   /* user-supplied huffman table */
        if (segment->result != NULL)
            jbig2_table_free(ctx, (Jbig2HuffmanParams *) segment->result);
        break;
    case 62:
        if (segment->result != NULL)
            jbig2_metadata_free(ctx, (Jbig2Metadata *) segment->result);
        break;
    default:
        /* anything else is probably an undefined pointer */
        break;
    }
    jbig2_free(ctx->allocator, segment);
}

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.