xps_init_truetype_font(xps_context_t *ctx, xps_font_t *font)
{
    int code = 0;

    font->font = (void*) gs_alloc_struct(ctx->memory, gs_font_type42, &st_gs_font_type42, "xps_font type42");
    if (!font->font)
        return gs_throw(gs_error_VMerror, "out of memory");

    /* no shortage of things to initialize */
    {
        gs_font_type42 *p42 = (gs_font_type42*) font->font;

        /* Common to all fonts: */

        p42->next = 0;
        p42->prev = 0;
        p42->memory = ctx->memory;

        p42->dir = ctx->fontdir; /* NB also set by gs_definefont later */
        p42->base = font->font; /* NB also set by gs_definefont later */
        p42->is_resource = false;
        gs_notify_init(&p42->notify_list, gs_memory_stable(ctx->memory));
        p42->id = gs_next_ids(ctx->memory, 1);

        p42->client_data = font; /* that's us */

        /* this is overwritten in grid_fit() */
        gs_make_identity(&p42->FontMatrix);
        gs_make_identity(&p42->orig_FontMatrix); /* NB ... original or zeroes? */

        p42->FontType = ft_TrueType;
        p42->BitmapWidths = false;
        p42->ExactSize = fbit_use_outlines;
        p42->InBetweenSize = fbit_use_outlines;
        p42->TransformedChar = fbit_use_outlines;
        p42->WMode = 0;
        p42->PaintType = 0;
        p42->StrokeWidth = 0;
        p42->is_cached = 0;

        p42->procs.define_font = gs_no_define_font;
        p42->procs.make_font = gs_no_make_font;
        p42->procs.font_info = gs_type42_font_info;
        p42->procs.same_font = gs_default_same_font;
        p42->procs.encode_char = xps_true_callback_encode_char;
        p42->procs.decode_glyph = xps_true_callback_decode_glyph;
        p42->procs.enumerate_glyph = gs_type42_enumerate_glyph;
        p42->procs.glyph_info = gs_type42_glyph_info;
        p42->procs.glyph_outline = gs_type42_glyph_outline;
        p42->procs.glyph_name = xps_true_callback_glyph_name;
        p42->procs.init_fstack = gs_default_init_fstack;
        p42->procs.next_char_glyph = gs_default_next_char_glyph;
         p42->procs.build_char = xps_true_callback_build_char;
 
         memset(p42->font_name.chars, 0, sizeof(p42->font_name.chars));
        xps_load_sfnt_name(font, (char*)p42->font_name.chars, sizeof(p42->font_name.chars));
         p42->font_name.size = strlen((char*)p42->font_name.chars);
 
         memset(p42->key_name.chars, 0, sizeof(p42->key_name.chars));
        strcpy((char*)p42->key_name.chars, (char*)p42->font_name.chars);
        p42->key_name.size = strlen((char*)p42->key_name.chars);

        /* Base font specific: */

        p42->FontBBox.p.x = 0;
        p42->FontBBox.p.y = 0;
        p42->FontBBox.q.x = 0;
        p42->FontBBox.q.y = 0;

        uid_set_UniqueID(&p42->UID, p42->id);

        p42->encoding_index = ENCODING_INDEX_UNKNOWN;
        p42->nearest_encoding_index = ENCODING_INDEX_ISOLATIN1;

        p42->FAPI = 0;
        p42->FAPI_font_data = 0;

        /* Type 42 specific: */

        p42->data.string_proc = xps_true_callback_string_proc;
        p42->data.proc_data = font;

        gs_type42_font_init(p42, font->subfontid);
        p42->data.get_glyph_index = xps_true_get_glyph_index;
    }

    if ((code = gs_definefont(ctx->fontdir, font->font)) < 0) {
        return(code);
    }

    code = xps_fapi_passfont (font->font, NULL, NULL, font->data, font->length);
    return code;
}

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.