return NULL; if((unsigned)owidth >= UINT_MAX / (LINE_BUF_HEIGHT + NB_TAPS))
ImgReSampleContext *img_resample_full_init(int owidth, int oheight,                                      int iwidth, int iheight,                                      int topBand, int bottomBand,        int leftBand, int rightBand,        int padtop, int padbottom,        int padleft, int padright){    ImgReSampleContext *s;    s = av_mallocz(sizeof(ImgReSampleContext));    if (!s)        return NULL;    s->line_buf = av_mallocz(owidth * (LINE_BUF_HEIGHT + NB_TAPS));    if (!s->line_buf)         goto fail;        s->owidth = owidth;    s->oheight = oheight;    s->iwidth = iwidth;    s->iheight = iheight;      s->topBand = topBand;    s->bottomBand = bottomBand;    s->leftBand = leftBand;    s->rightBand = rightBand;        s->padtop = padtop;    s->padbottom = padbottom;    s->padleft = padleft;    s->padright = padright;    s->pad_owidth = owidth - (padleft + padright);    s->pad_oheight = oheight - (padtop + padbottom);    s->h_incr = ((iwidth - leftBand - rightBand) * POS_FRAC) / s->pad_owidth;    s->v_incr = ((iheight - topBand - bottomBand) * POS_FRAC) / s->pad_oheight;     av_build_filter(&s->h_filters[0][0], (float) s->pad_owidth  /             (float) (iwidth - leftBand - rightBand), NB_TAPS, NB_PHASES, 1<<FILTER_BITS, 0);    av_build_filter(&s->v_filters[0][0], (float) s->pad_oheight /             (float) (iheight - topBand - bottomBand), NB_TAPS, NB_PHASES, 1<<FILTER_BITS, 0);    return s;fail:    av_free(s);    return NULL;}