static void mct_decode(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile)
{
    int i, csize = 1;
    int32_t *src[3],  i0,  i1,  i2;
    float   *srcf[3], i0f, i1f, i2f;

    for (i = 1; i < 3; i++)
        if (tile->codsty[0].transform != tile->codsty[i].transform) {
            av_log(s->avctx, AV_LOG_ERROR, "Transforms mismatch, MCT not supported\n");
            return;
        }

    for (i = 0; i < 3; i++)
        if (tile->codsty[0].transform == FF_DWT97)
            srcf[i] = tile->comp[i].f_data;
        else
            src [i] = tile->comp[i].i_data;

    for (i = 0; i < 2; i++)
        csize *= tile->comp[0].coord[i][1] - tile->comp[0].coord[i][0];

    switch (tile->codsty[0].transform) {
    case FF_DWT97:
        for (i = 0; i < csize; i++) {
            i0f = *srcf[0] + (f_ict_params[0] * *srcf[2]);
            i1f = *srcf[0] - (f_ict_params[1] * *srcf[1])
                           - (f_ict_params[2] * *srcf[2]);
            i2f = *srcf[0] + (f_ict_params[3] * *srcf[1]);
            *srcf[0]++ = i0f;
            *srcf[1]++ = i1f;
            *srcf[2]++ = i2f;
        }
        break;
    case FF_DWT97_INT:
        for (i = 0; i < csize; i++) {
            i0 = *src[0] + (((i_ict_params[0] * *src[2]) + (1 << 15)) >> 16);
            i1 = *src[0] - (((i_ict_params[1] * *src[1]) + (1 << 15)) >> 16)
                         - (((i_ict_params[2] * *src[2]) + (1 << 15)) >> 16);
            i2 = *src[0] + (((i_ict_params[3] * *src[1]) + (1 << 15)) >> 16);
            *src[0]++ = i0;
            *src[1]++ = i1;
            *src[2]++ = i2;
        }
        break;
    case FF_DWT53:
        for (i = 0; i < csize; i++) {
            i1 = *src[0] - (*src[2] + *src[1] >> 2);
            i0 = i1 + *src[2];
            i2 = i1 + *src[1];
            *src[0]++ = i0;
            *src[1]++ = i1;
            *src[2]++ = i2;
        }
        break;
    }
}

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.