pdf14_clist_update_params(pdf14_clist_device * pdev, const gs_gstate * pgs,
                          bool crop_blend_params,
                          gs_pdf14trans_params_t *group_params)
{
    gs_pdf14trans_params_t params = { 0 };
    gx_device * pcdev;
    int changed = 0;
    int code = 0;
    gs_composite_t *pct_new = NULL;

    params.crop_blend_params = crop_blend_params;

    params.pdf14_op = PDF14_SET_BLEND_PARAMS;
    if (pgs->blend_mode != pdev->blend_mode) {
        changed |= PDF14_SET_BLEND_MODE;
        params.blend_mode = pdev->blend_mode = pgs->blend_mode;
    }
    if (pgs->text_knockout != pdev->text_knockout) {
        changed |= PDF14_SET_TEXT_KNOCKOUT;
        params.text_knockout = pdev->text_knockout = pgs->text_knockout;
    }
    if (pgs->shape.alpha != pdev->shape) {
        changed |= PDF14_SET_SHAPE_ALPHA;
        params.shape.alpha = pdev->shape = pgs->shape.alpha;
    }
    if (pgs->opacity.alpha != pdev->opacity) {
        changed |= PDF14_SET_OPACITY_ALPHA;
        params.opacity.alpha = pdev->opacity = pgs->opacity.alpha;
    }
    if (pgs->overprint != pdev->overprint) {
        changed |= PDF14_SET_OVERPRINT;
        params.overprint = pdev->overprint = pgs->overprint;
    }
    if (pgs->overprint_mode != pdev->overprint_mode) {
        changed |= PDF14_SET_OVERPRINT_MODE;
        params.overprint_mode = pdev->overprint_mode = pgs->overprint_mode;
    }
    if (crop_blend_params) {
        params.ctm = group_params->ctm;
        params.bbox = group_params->bbox;
    }
    params.changed = changed;
    /* Avoid recursion when we have a PDF14_SET_BLEND_PARAMS forced and apply
       now to the target.  Otherwise we send of te compositor action
       to the pdf14 device at this time.  This is due to the fact that we
       need to often perform this operation when we are already starting to
       do a compositor action */
    if (changed != 0) {
        code = gs_create_pdf14trans(&pct_new, &params, pgs->memory);
        if (code < 0) return code;
        code = dev_proc(pdev->target, create_compositor)
                    (pdev->target, &pcdev, pct_new, (gs_gstate *)pgs, pgs->memory, NULL);
        gs_free_object(pgs->memory, pct_new, "pdf14_clist_update_params");
    }
    return code;
}

The product dereferences a pointer that it expects to be valid but is NULL.