jbig2_complete_page(Jbig2Ctx *ctx)
{
    int code = 0;

    /* check for unfinished segments */
    if (ctx->segment_index != ctx->n_segments) {
        Jbig2Segment *segment = ctx->segments[ctx->segment_index];

        /* Some versions of Xerox Workcentre generate PDF files
           with the segment data length field of the last segment
           set to -1. Try to cope with this here. */
        if ((segment->data_length & 0xffffffff) == 0xffffffff) {
            jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number, "File has an invalid segment data length!" " Trying to decode using the available data.");
            segment->data_length = ctx->buf_wr_ix - ctx->buf_rd_ix;
            code = jbig2_parse_segment(ctx, segment, ctx->buf + ctx->buf_rd_ix);
            ctx->buf_rd_ix += segment->data_length;
            ctx->segment_index++;
        }
    }

    /* ensure image exists before marking page as complete */
    if (ctx->pages[ctx->current_page].image != NULL) {
        ctx->pages[ctx->current_page].state = JBIG2_PAGE_COMPLETE;
    }

    return code;
}

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.