OPJ_BOOL opj_tcd_dc_level_shift_decode ( opj_tcd_t *p_tcd )
{
        OPJ_UINT32 compno;
        opj_tcd_tilecomp_t * l_tile_comp = 00;
        opj_tccp_t * l_tccp = 00;
        opj_image_comp_t * l_img_comp = 00;
        opj_tcd_resolution_t* l_res = 00;
        opj_tcd_tile_t * l_tile;
        OPJ_UINT32 l_width,l_height,i,j;
        OPJ_INT32 * l_current_ptr;
        OPJ_INT32 l_min, l_max;
        OPJ_UINT32 l_stride;

        l_tile = p_tcd->tcd_image->tiles;
        l_tile_comp = l_tile->comps;
        l_tccp = p_tcd->tcp->tccps;
        l_img_comp = p_tcd->image->comps;

        for (compno = 0; compno < l_tile->numcomps; compno++) {
                l_res = l_tile_comp->resolutions + l_img_comp->resno_decoded;
                l_width = (OPJ_UINT32)(l_res->x1 - l_res->x0);
                l_height = (OPJ_UINT32)(l_res->y1 - l_res->y0);
                l_stride = (OPJ_UINT32)(l_tile_comp->x1 - l_tile_comp->x0) - l_width;

                assert(l_height == 0 || l_width + l_stride <= l_tile_comp->data_size / l_height); /*MUPDF*/

                if (l_img_comp->sgnd) {
                        l_min = -(1 << (l_img_comp->prec - 1));
                        l_max = (1 << (l_img_comp->prec - 1)) - 1;
                }
                else {
            l_min = 0;
                        l_max = (1 << l_img_comp->prec) - 1;
                }

                l_current_ptr = l_tile_comp->data;

                if (l_tccp->qmfbid == 1) {
                        for (j=0;j<l_height;++j) {
                                for (i = 0; i < l_width; ++i) {
                                        *l_current_ptr = opj_int_clamp(*l_current_ptr + l_tccp->m_dc_level_shift, l_min, l_max);
                                        ++l_current_ptr;
                                }
                                l_current_ptr += l_stride;
                        }
                }
                else {
                        for (j=0;j<l_height;++j) {
                                for (i = 0; i < l_width; ++i) {
                                        OPJ_FLOAT32 l_value = *((OPJ_FLOAT32 *) l_current_ptr);
                                        *l_current_ptr = opj_int_clamp((OPJ_INT32)lrintf(l_value) + l_tccp->m_dc_level_shift, l_min, l_max); ;
                                        ++l_current_ptr;
                                }
                                l_current_ptr += l_stride;
                        }
                }

                ++l_img_comp;
                ++l_tccp;
                ++l_tile_comp;
        }

        return OPJ_TRUE;
}

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.