jbig2_default_error(void *data, const char *msg, Jbig2Severity severity, int32_t seg_idx)
{
    /* report only fatal errors by default */
    if (severity == JBIG2_SEVERITY_FATAL) {
        fprintf(stderr, "jbig2 decoder FATAL ERROR: %s", msg);
        if (seg_idx != -1)
            fprintf(stderr, " (segment 0x%02x)", seg_idx);
        fprintf(stderr, "\n");
        fflush(stderr);
    }

    return 0;
}

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.