static int jpeg2000_decode_tile(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
                                AVFrame *picture)
{
    int compno, reslevelno, bandno;
    int x, y;

    uint8_t *line;
    Jpeg2000T1Context t1;

    /* Loop on tile components */
    for (compno = 0; compno < s->ncomponents; compno++) {
        Jpeg2000Component *comp     = tile->comp + compno;
        Jpeg2000CodingStyle *codsty = tile->codsty + compno;

        /* Loop on resolution levels */
        for (reslevelno = 0; reslevelno < codsty->nreslevels2decode; reslevelno++) {
            Jpeg2000ResLevel *rlevel = comp->reslevel + reslevelno;
            /* Loop on bands */
            for (bandno = 0; bandno < rlevel->nbands; bandno++) {
                int nb_precincts, precno;
                Jpeg2000Band *band = rlevel->band + bandno;
                int cblkno = 0, bandpos;

                bandpos = bandno + (reslevelno > 0);

                if (band->coord[0][0] == band->coord[0][1] ||
                    band->coord[1][0] == band->coord[1][1])
                    continue;

                nb_precincts = rlevel->num_precincts_x * rlevel->num_precincts_y;
                /* Loop on precincts */
                for (precno = 0; precno < nb_precincts; precno++) {
                    Jpeg2000Prec *prec = band->prec + precno;

                    /* Loop on codeblocks */
                    for (cblkno = 0; cblkno < prec->nb_codeblocks_width * prec->nb_codeblocks_height; cblkno++) {
                        int x, y;
                        Jpeg2000Cblk *cblk = prec->cblk + cblkno;
                        decode_cblk(s, codsty, &t1, cblk,
                                    cblk->coord[0][1] - cblk->coord[0][0],
                                    cblk->coord[1][1] - cblk->coord[1][0],
                                    bandpos);

                        x = cblk->coord[0][0];
                        y = cblk->coord[1][0];

                        if (codsty->transform == FF_DWT97)
                            dequantization_float(x, y, cblk, comp, &t1, band);
                        else
                            dequantization_int(x, y, cblk, comp, &t1, band);
                   } /* end cblk */
                } /*end prec */
            } /* end band */
        } /* end reslevel */

        /* inverse DWT */
        ff_dwt_decode(&comp->dwt, codsty->transform == FF_DWT97 ? (void*)comp->f_data : (void*)comp->i_data);
    } /*end comp */

    /* inverse MCT transformation */
    if (tile->codsty[0].mct)
        mct_decode(s, tile);

    if (s->cdef[0] < 0) {
        for (x = 0; x < s->ncomponents; x++)
            s->cdef[x] = x + 1;
        if ((s->ncomponents & 1) == 0)
            s->cdef[s->ncomponents-1] = 0;
    }

    if (s->precision <= 8) {
        for (compno = 0; compno < s->ncomponents; compno++) {
            Jpeg2000Component *comp = tile->comp + compno;
            Jpeg2000CodingStyle *codsty = tile->codsty + compno;
            float *datap = comp->f_data;
            int32_t *i_datap = comp->i_data;
            int cbps = s->cbps[compno];
            int w = tile->comp[compno].coord[0][1] - s->image_offset_x;
            int planar = !!picture->data[2];
            int pixelsize = planar ? 1 : s->ncomponents;
            int plane = 0;

            if (planar)
                plane = s->cdef[compno] ? s->cdef[compno]-1 : (s->ncomponents-1);
 
 
             y    = tile->comp[compno].coord[1][0] - s->image_offset_y;
            line = picture->data[plane] + y * picture->linesize[plane];
             for (; y < tile->comp[compno].coord[1][1] - s->image_offset_y; y += s->cdy[compno]) {
                 uint8_t *dst;
 
                 x   = tile->comp[compno].coord[0][0] - s->image_offset_x;
                dst = line + x * pixelsize + compno*!planar;
 
                 if (codsty->transform == FF_DWT97) {
                     for (; x < w; x += s->cdx[compno]) {
                        int val = lrintf(*datap) + (1 << (cbps - 1));
                        /* DC level shift and clip see ISO 15444-1:2002 G.1.2 */
                        val = av_clip(val, 0, (1 << cbps) - 1);
                        *dst = val << (8 - cbps);
                        datap++;
                        dst += pixelsize;
                    }
                } else {
                    for (; x < w; x += s->cdx[compno]) {
                        int val = *i_datap + (1 << (cbps - 1));
                        /* DC level shift and clip see ISO 15444-1:2002 G.1.2 */
                        val = av_clip(val, 0, (1 << cbps) - 1);
                        *dst = val << (8 - cbps);
                        i_datap++;
                        dst += pixelsize;
                    }
                }
                line += picture->linesize[plane];
            }
        }
    } else {
        for (compno = 0; compno < s->ncomponents; compno++) {
            Jpeg2000Component *comp = tile->comp + compno;
            Jpeg2000CodingStyle *codsty = tile->codsty + compno;
            float *datap = comp->f_data;
            int32_t *i_datap = comp->i_data;
            uint16_t *linel;
            int cbps = s->cbps[compno];
            int w = tile->comp[compno].coord[0][1] - s->image_offset_x;
            int planar = !!picture->data[2];
            int pixelsize = planar ? 1 : s->ncomponents;
            int plane = 0;

            if (planar)
                 plane = s->cdef[compno] ? s->cdef[compno]-1 : (s->ncomponents-1);
 
             y     = tile->comp[compno].coord[1][0] - s->image_offset_y;
            linel = (uint16_t *)picture->data[plane] + y * (picture->linesize[plane] >> 1);
             for (; y < tile->comp[compno].coord[1][1] - s->image_offset_y; y += s->cdy[compno]) {
                 uint16_t *dst;
 
                 x   = tile->comp[compno].coord[0][0] - s->image_offset_x;
                dst = linel + (x * pixelsize + compno*!planar);
                 if (codsty->transform == FF_DWT97) {
                     for (; x < w; x += s-> cdx[compno]) {
                         int  val = lrintf(*datap) + (1 << (cbps - 1));
                        /* DC level shift and clip see ISO 15444-1:2002 G.1.2 */
                        val = av_clip(val, 0, (1 << cbps) - 1);
                        /* align 12 bit values in little-endian mode */
                        *dst = val << (16 - cbps);
                        datap++;
                        dst += pixelsize;
                    }
                } else {
                    for (; x < w; x += s-> cdx[compno]) {
                        int val = *i_datap + (1 << (cbps - 1));
                        /* DC level shift and clip see ISO 15444-1:2002 G.1.2 */
                        val = av_clip(val, 0, (1 << cbps) - 1);
                        /* align 12 bit values in little-endian mode */
                        *dst = val << (16 - cbps);
                        i_datap++;
                        dst += pixelsize;
                    }
                }
                linel += picture->linesize[plane] >> 1;
            }
        }
    }

    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.