static void ssd0323_update_display(void *opaque)
{
    ssd0323_state *s = (ssd0323_state *)opaque;
    DisplaySurface *surface = qemu_console_surface(s->con);
    uint8_t *dest;
    uint8_t *src;
    int x;
    int y;
    int i;
    int line;
    char *colors[16];
    char colortab[MAGNIFY * 64];
    char *p;
    int dest_width;

    if (!s->redraw)
        return;

    switch (surface_bits_per_pixel(surface)) {
    case 0:
        return;
    case 15:
        dest_width = 2;
        break;
    case 16:
        dest_width = 2;
        break;
    case 24:
        dest_width = 3;
        break;
    case 32:
        dest_width = 4;
        break;
    default:
        BADF("Bad color depth\n");
        return;
    }
    p = colortab;
    for (i = 0; i < 16; i++) {
        int n;
        colors[i] = p;
        switch (surface_bits_per_pixel(surface)) {
        case 15:
            n = i * 2 + (i >> 3);
            p[0] = n | (n << 5);
            p[1] = (n << 2) | (n >> 3);
            break;
        case 16:
            n = i * 2 + (i >> 3);
            p[0] = n | (n << 6) | ((n << 1) & 0x20);
            p[1] = (n << 3) | (n >> 2);
            break;
        case 24:
        case 32:
            n = (i << 4) | i;
            p[0] = p[1] = p[2] = n;
            break;
        default:
            BADF("Bad color depth\n");
            return;
        }
        p += dest_width;
    }
    /* TODO: Implement row/column remapping.  */
    dest = surface_data(surface);
    for (y = 0; y < 64; y++) {
        line = y;
        src = s->framebuffer + 64 * line;
        for (x = 0; x < 64; x++) {
            int val;
            val = *src >> 4;
            for (i = 0; i < MAGNIFY; i++) {
                memcpy(dest, colors[val], dest_width);
                dest += dest_width;
            }
            val = *src & 0xf;
            for (i = 0; i < MAGNIFY; i++) {
                memcpy(dest, colors[val], dest_width);
                dest += dest_width;
            }
            src++;
        }
        for (i = 1; i < MAGNIFY; i++) {
            memcpy(dest, dest - dest_width * MAGNIFY * 128,
                   dest_width * 128 * MAGNIFY);
            dest += dest_width * 128 * MAGNIFY;
        }
    }
    s->redraw = 0;
    dpy_gfx_update(s->con, 0, 0, 128 * MAGNIFY, 64 * MAGNIFY);
}

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.