static int jpc_dec_tileinit(jpc_dec_t *dec, jpc_dec_tile_t *tile)
{
	jpc_dec_tcomp_t *tcomp;
	int compno;
	int rlvlno;
	jpc_dec_rlvl_t *rlvl;
	jpc_dec_band_t *band;
	jpc_dec_prc_t *prc;
	int bndno;
	jpc_tsfb_band_t *bnd;
	int bandno;
	jpc_dec_ccp_t *ccp;
	int prccnt;
	jpc_dec_cblk_t *cblk;
	int cblkcnt;
	uint_fast32_t tlprcxstart;
	uint_fast32_t tlprcystart;
	uint_fast32_t brprcxend;
	uint_fast32_t brprcyend;
	uint_fast32_t tlcbgxstart;
	uint_fast32_t tlcbgystart;
	uint_fast32_t brcbgxend;
	uint_fast32_t brcbgyend;
	uint_fast32_t cbgxstart;
	uint_fast32_t cbgystart;
	uint_fast32_t cbgxend;
	uint_fast32_t cbgyend;
	uint_fast32_t tlcblkxstart;
	uint_fast32_t tlcblkystart;
	uint_fast32_t brcblkxend;
	uint_fast32_t brcblkyend;
	uint_fast32_t cblkxstart;
	uint_fast32_t cblkystart;
	uint_fast32_t cblkxend;
	uint_fast32_t cblkyend;
	uint_fast32_t tmpxstart;
	uint_fast32_t tmpystart;
 	uint_fast32_t tmpxend;
 	uint_fast32_t tmpyend;
 	jpc_dec_cp_t *cp;
	jpc_tsfb_band_t bnds[64];
 	jpc_pchg_t *pchg;
 	int pchgno;
 	jpc_dec_cmpt_t *cmpt;

	cp = tile->cp;
	tile->realmode = 0;
	if (cp->mctid == JPC_MCT_ICT) {
		tile->realmode = 1;
	}

	for (compno = 0, tcomp = tile->tcomps, cmpt = dec->cmpts; compno <
	  dec->numcomps; ++compno, ++tcomp, ++cmpt) {
		ccp = &tile->cp->ccps[compno];
		if (ccp->qmfbid == JPC_COX_INS) {
			tile->realmode = 1;
		}
		tcomp->numrlvls = ccp->numrlvls;
		if (!(tcomp->rlvls = jas_alloc2(tcomp->numrlvls,
		  sizeof(jpc_dec_rlvl_t)))) {
			return -1;
		}
		if (!(tcomp->data = jas_seq2d_create(JPC_CEILDIV(tile->xstart,
		  cmpt->hstep), JPC_CEILDIV(tile->ystart, cmpt->vstep),
		  JPC_CEILDIV(tile->xend, cmpt->hstep), JPC_CEILDIV(tile->yend,
		  cmpt->vstep)))) {
			return -1;
		}
		if (!(tcomp->tsfb = jpc_cod_gettsfb(ccp->qmfbid,
		  tcomp->numrlvls - 1))) {
			return -1;
		}
		{
			jpc_tsfb_getbands(tcomp->tsfb, jas_seq2d_xstart(tcomp->data),
			  jas_seq2d_ystart(tcomp->data), jas_seq2d_xend(tcomp->data),
			  jas_seq2d_yend(tcomp->data), bnds);
		}
		for (rlvlno = 0, rlvl = tcomp->rlvls; rlvlno < tcomp->numrlvls;
		  ++rlvlno, ++rlvl) {
			rlvl->bands = 0;
			rlvl->xstart = JPC_CEILDIVPOW2(tcomp->xstart,
			  tcomp->numrlvls - 1 - rlvlno);
			rlvl->ystart = JPC_CEILDIVPOW2(tcomp->ystart,
			  tcomp->numrlvls - 1 - rlvlno);
			rlvl->xend = JPC_CEILDIVPOW2(tcomp->xend,
			  tcomp->numrlvls - 1 - rlvlno);
			rlvl->yend = JPC_CEILDIVPOW2(tcomp->yend,
			  tcomp->numrlvls - 1 - rlvlno);
			rlvl->prcwidthexpn = ccp->prcwidthexpns[rlvlno];
			rlvl->prcheightexpn = ccp->prcheightexpns[rlvlno];
			tlprcxstart = JPC_FLOORDIVPOW2(rlvl->xstart,
			  rlvl->prcwidthexpn) << rlvl->prcwidthexpn;
			tlprcystart = JPC_FLOORDIVPOW2(rlvl->ystart,
			  rlvl->prcheightexpn) << rlvl->prcheightexpn;
			brprcxend = JPC_CEILDIVPOW2(rlvl->xend,
			  rlvl->prcwidthexpn) << rlvl->prcwidthexpn;
			brprcyend = JPC_CEILDIVPOW2(rlvl->yend,
			  rlvl->prcheightexpn) << rlvl->prcheightexpn;
			rlvl->numhprcs = (brprcxend - tlprcxstart) >>
			  rlvl->prcwidthexpn;
			rlvl->numvprcs = (brprcyend - tlprcystart) >>
			  rlvl->prcheightexpn;
			rlvl->numprcs = rlvl->numhprcs * rlvl->numvprcs;

			if (rlvl->xstart >= rlvl->xend || rlvl->ystart >= rlvl->yend) {
				rlvl->bands = 0;
				rlvl->numprcs = 0;
				rlvl->numhprcs = 0;
				rlvl->numvprcs = 0;
				continue;
			}	
			if (!rlvlno) {
				tlcbgxstart = tlprcxstart;
				tlcbgystart = tlprcystart;
				brcbgxend = brprcxend;
				brcbgyend = brprcyend;
				rlvl->cbgwidthexpn = rlvl->prcwidthexpn;
				rlvl->cbgheightexpn = rlvl->prcheightexpn;
			} else {
				tlcbgxstart = JPC_CEILDIVPOW2(tlprcxstart, 1);
				tlcbgystart = JPC_CEILDIVPOW2(tlprcystart, 1);
				brcbgxend = JPC_CEILDIVPOW2(brprcxend, 1);
				brcbgyend = JPC_CEILDIVPOW2(brprcyend, 1);
				rlvl->cbgwidthexpn = rlvl->prcwidthexpn - 1;
				rlvl->cbgheightexpn = rlvl->prcheightexpn - 1;
			}
			rlvl->cblkwidthexpn = JAS_MIN(ccp->cblkwidthexpn,
			  rlvl->cbgwidthexpn);
			rlvl->cblkheightexpn = JAS_MIN(ccp->cblkheightexpn,
			  rlvl->cbgheightexpn);

			rlvl->numbands = (!rlvlno) ? 1 : 3;
			if (!(rlvl->bands = jas_alloc2(rlvl->numbands,
			  sizeof(jpc_dec_band_t)))) {
				return -1;
			}
			for (bandno = 0, band = rlvl->bands;
			  bandno < rlvl->numbands; ++bandno, ++band) {
				bndno = (!rlvlno) ? 0 : (3 * (rlvlno - 1) +
				  bandno + 1);
				bnd = &bnds[bndno];

				band->orient = bnd->orient;
				band->stepsize = ccp->stepsizes[bndno];
				band->analgain = JPC_NOMINALGAIN(ccp->qmfbid,
				  tcomp->numrlvls - 1, rlvlno, band->orient);
				band->absstepsize = jpc_calcabsstepsize(band->stepsize,
				  cmpt->prec + band->analgain);
				band->numbps = ccp->numguardbits +
				  JPC_QCX_GETEXPN(band->stepsize) - 1;
				band->roishift = (ccp->roishift + band->numbps >= JPC_PREC) ?
				  (JPC_PREC - 1 - band->numbps) : ccp->roishift;
				band->data = 0;
				band->prcs = 0;
				if (bnd->xstart == bnd->xend || bnd->ystart == bnd->yend) {
					continue;
				}
				if (!(band->data = jas_seq2d_create(0, 0, 0, 0))) {
					return -1;
				}
				jas_seq2d_bindsub(band->data, tcomp->data, bnd->locxstart,
				  bnd->locystart, bnd->locxend, bnd->locyend);
				jas_seq2d_setshift(band->data, bnd->xstart, bnd->ystart);

				assert(rlvl->numprcs);

				if (!(band->prcs = jas_alloc2(rlvl->numprcs,
				  sizeof(jpc_dec_prc_t)))) {
					return -1;
				}

/************************************************/
				cbgxstart = tlcbgxstart;
				cbgystart = tlcbgystart;
				for (prccnt = rlvl->numprcs, prc = band->prcs;
				  prccnt > 0; --prccnt, ++prc) {
					cbgxend = cbgxstart + (1 << rlvl->cbgwidthexpn);
					cbgyend = cbgystart + (1 << rlvl->cbgheightexpn);
					prc->xstart = JAS_MAX(cbgxstart, JAS_CAST(uint_fast32_t,
					  jas_seq2d_xstart(band->data)));
					prc->ystart = JAS_MAX(cbgystart, JAS_CAST(uint_fast32_t,
					  jas_seq2d_ystart(band->data)));
					prc->xend = JAS_MIN(cbgxend, JAS_CAST(uint_fast32_t,
					  jas_seq2d_xend(band->data)));
					prc->yend = JAS_MIN(cbgyend, JAS_CAST(uint_fast32_t,
					  jas_seq2d_yend(band->data)));
					if (prc->xend > prc->xstart && prc->yend > prc->ystart) {
						tlcblkxstart = JPC_FLOORDIVPOW2(prc->xstart,
						  rlvl->cblkwidthexpn) << rlvl->cblkwidthexpn;
						tlcblkystart = JPC_FLOORDIVPOW2(prc->ystart,
						  rlvl->cblkheightexpn) << rlvl->cblkheightexpn;
						brcblkxend = JPC_CEILDIVPOW2(prc->xend,
						  rlvl->cblkwidthexpn) << rlvl->cblkwidthexpn;
						brcblkyend = JPC_CEILDIVPOW2(prc->yend,
						  rlvl->cblkheightexpn) << rlvl->cblkheightexpn;
						prc->numhcblks = (brcblkxend - tlcblkxstart) >>
						  rlvl->cblkwidthexpn;
						prc->numvcblks = (brcblkyend - tlcblkystart) >>
						  rlvl->cblkheightexpn;
						prc->numcblks = prc->numhcblks * prc->numvcblks;
						assert(prc->numcblks > 0);

						if (!(prc->incltagtree = jpc_tagtree_create(
						  prc->numhcblks, prc->numvcblks))) {
							return -1;
						}
						if (!(prc->numimsbstagtree = jpc_tagtree_create(
						  prc->numhcblks, prc->numvcblks))) {
							return -1;
						}
						if (!(prc->cblks = jas_alloc2(prc->numcblks,
						  sizeof(jpc_dec_cblk_t)))) {
							return -1;
						}

						cblkxstart = cbgxstart;
						cblkystart = cbgystart;
						for (cblkcnt = prc->numcblks, cblk = prc->cblks;
						  cblkcnt > 0;) {
							cblkxend = cblkxstart + (1 << rlvl->cblkwidthexpn);
							cblkyend = cblkystart + (1 << rlvl->cblkheightexpn);
							tmpxstart = JAS_MAX(cblkxstart, prc->xstart);
							tmpystart = JAS_MAX(cblkystart, prc->ystart);
							tmpxend = JAS_MIN(cblkxend, prc->xend);
							tmpyend = JAS_MIN(cblkyend, prc->yend);
							if (tmpxend > tmpxstart && tmpyend > tmpystart) {
								cblk->firstpassno = -1;
								cblk->mqdec = 0;
								cblk->nulldec = 0;
								cblk->flags = 0;
								cblk->numpasses = 0;
								cblk->segs.head = 0;
								cblk->segs.tail = 0;
								cblk->curseg = 0;
								cblk->numimsbs = 0;
								cblk->numlenbits = 3;
								cblk->flags = 0;
								if (!(cblk->data = jas_seq2d_create(0, 0, 0,
								  0))) {
									return -1;
								}
								jas_seq2d_bindsub(cblk->data, band->data,
								  tmpxstart, tmpystart, tmpxend, tmpyend);
								++cblk;
								--cblkcnt;
							}
							cblkxstart += 1 << rlvl->cblkwidthexpn;
							if (cblkxstart >= cbgxend) {
								cblkxstart = cbgxstart;
								cblkystart += 1 << rlvl->cblkheightexpn;
							}
						}

					} else {
						prc->cblks = 0;
						prc->incltagtree = 0;
						prc->numimsbstagtree = 0;
					}
					cbgxstart += 1 << rlvl->cbgwidthexpn;
					if (cbgxstart >= brcbgxend) {
						cbgxstart = tlcbgxstart;
						cbgystart += 1 << rlvl->cbgheightexpn;
					}

				}
/********************************************/
			}
		}
	}

	if (!(tile->pi = jpc_dec_pi_create(dec, tile))) {
		return -1;
	}

	for (pchgno = 0; pchgno < jpc_pchglist_numpchgs(tile->cp->pchglist);
	  ++pchgno) {
		pchg = jpc_pchg_copy(jpc_pchglist_get(tile->cp->pchglist, pchgno));
		assert(pchg);
		jpc_pi_addpchg(tile->pi, pchg);
	}
	jpc_pi_init(tile->pi);

	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.