static int get_siz(Jpeg2000DecoderContext *s)
{
    int i;
    int ncomponents;
    uint32_t log2_chroma_wh = 0;
    const enum AVPixelFormat *possible_fmts = NULL;
    int possible_fmts_nb = 0;

    if (bytestream2_get_bytes_left(&s->g) < 36)
        return AVERROR_INVALIDDATA;

    s->avctx->profile = bytestream2_get_be16u(&s->g); // Rsiz
    s->width          = bytestream2_get_be32u(&s->g); // Width
    s->height         = bytestream2_get_be32u(&s->g); // Height
    s->image_offset_x = bytestream2_get_be32u(&s->g); // X0Siz
    s->image_offset_y = bytestream2_get_be32u(&s->g); // Y0Siz
    s->tile_width     = bytestream2_get_be32u(&s->g); // XTSiz
    s->tile_height    = bytestream2_get_be32u(&s->g); // YTSiz
    s->tile_offset_x  = bytestream2_get_be32u(&s->g); // XT0Siz
    s->tile_offset_y  = bytestream2_get_be32u(&s->g); // YT0Siz
    ncomponents       = bytestream2_get_be16u(&s->g); // CSiz

    if (ncomponents <= 0) {
        av_log(s->avctx, AV_LOG_ERROR, "Invalid number of components: %d\n",
               s->ncomponents);
        return AVERROR_INVALIDDATA;
    }

    if (ncomponents > 4) {
        avpriv_request_sample(s->avctx, "Support for %d components",
                              s->ncomponents);
        return AVERROR_PATCHWELCOME;
    }

    s->ncomponents = ncomponents;

    if (s->tile_width <= 0 || s->tile_height <= 0) {
        av_log(s->avctx, AV_LOG_ERROR, "Invalid tile dimension %dx%d.\n",
               s->tile_width, s->tile_height);
        return AVERROR_INVALIDDATA;
    }

    if (bytestream2_get_bytes_left(&s->g) < 3 * s->ncomponents)
        return AVERROR_INVALIDDATA;

    for (i = 0; i < s->ncomponents; i++) { // Ssiz_i XRsiz_i, YRsiz_i
        uint8_t x    = bytestream2_get_byteu(&s->g);
        s->cbps[i]   = (x & 0x7f) + 1;
        s->precision = FFMAX(s->cbps[i], s->precision);
         s->sgnd[i]   = !!(x & 0x80);
         s->cdx[i]    = bytestream2_get_byteu(&s->g);
         s->cdy[i]    = bytestream2_get_byteu(&s->g);
        if (!s->cdx[i] || !s->cdy[i]) {
             av_log(s->avctx, AV_LOG_ERROR, "Invalid sample seperation\n");
             return AVERROR_INVALIDDATA;
         }
        log2_chroma_wh |= s->cdy[i] >> 1 << i * 4 | s->cdx[i] >> 1 << i * 4 + 2;
    }

    s->numXtiles = ff_jpeg2000_ceildiv(s->width  - s->tile_offset_x, s->tile_width);
    s->numYtiles = ff_jpeg2000_ceildiv(s->height - s->tile_offset_y, s->tile_height);

    if (s->numXtiles * (uint64_t)s->numYtiles > INT_MAX/sizeof(*s->tile)) {
        s->numXtiles = s->numYtiles = 0;
        return AVERROR(EINVAL);
    }

    s->tile = av_mallocz_array(s->numXtiles * s->numYtiles, sizeof(*s->tile));
    if (!s->tile) {
        s->numXtiles = s->numYtiles = 0;
        return AVERROR(ENOMEM);
    }

    for (i = 0; i < s->numXtiles * s->numYtiles; i++) {
        Jpeg2000Tile *tile = s->tile + i;

        tile->comp = av_mallocz(s->ncomponents * sizeof(*tile->comp));
        if (!tile->comp)
            return AVERROR(ENOMEM);
    }

    /* compute image size with reduction factor */
    s->avctx->width  = ff_jpeg2000_ceildivpow2(s->width  - s->image_offset_x,
                                               s->reduction_factor);
    s->avctx->height = ff_jpeg2000_ceildivpow2(s->height - s->image_offset_y,
                                               s->reduction_factor);

    if (s->avctx->profile == FF_PROFILE_JPEG2000_DCINEMA_2K ||
        s->avctx->profile == FF_PROFILE_JPEG2000_DCINEMA_4K) {
        possible_fmts = xyz_pix_fmts;
        possible_fmts_nb = FF_ARRAY_ELEMS(xyz_pix_fmts);
    } else {
        switch (s->colour_space) {
        case 16:
            possible_fmts = rgb_pix_fmts;
            possible_fmts_nb = FF_ARRAY_ELEMS(rgb_pix_fmts);
            break;
        case 17:
            possible_fmts = gray_pix_fmts;
            possible_fmts_nb = FF_ARRAY_ELEMS(gray_pix_fmts);
            break;
        case 18:
            possible_fmts = yuv_pix_fmts;
            possible_fmts_nb = FF_ARRAY_ELEMS(yuv_pix_fmts);
            break;
        default:
            possible_fmts = all_pix_fmts;
            possible_fmts_nb = FF_ARRAY_ELEMS(all_pix_fmts);
            break;
        }
    }
    for (i = 0; i < possible_fmts_nb; ++i) {
        if (pix_fmt_match(possible_fmts[i], ncomponents, s->precision, log2_chroma_wh, s->pal8)) {
            s->avctx->pix_fmt = possible_fmts[i];
            break;
        }
    }
    if (s->avctx->pix_fmt == AV_PIX_FMT_NONE) {
        av_log(s->avctx, AV_LOG_ERROR,
               "Unknown pix_fmt, profile: %d, colour_space: %d, "
               "components: %d, precision: %d, "
               "cdx[1]: %d, cdy[1]: %d, cdx[2]: %d, cdy[2]: %d\n",
               s->avctx->profile, s->colour_space, ncomponents, s->precision,
               ncomponents > 2 ? s->cdx[1] : 0,
               ncomponents > 2 ? s->cdy[1] : 0,
               ncomponents > 2 ? s->cdx[2] : 0,
               ncomponents > 2 ? s->cdy[2] : 0);
    }
    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.