external/zlib/ubsan.patch

   1 --- trees.c
   2 +++ trees.c
   3 @@ -870,7 +870,7 @@
   4      bi_windup(s);        /* align on byte boundary */
   5      put_short(s, (ush)stored_len);
   6      put_short(s, (ush)~stored_len);
   7 -    zmemcpy(s->pending_buf + s->pending, (Bytef *)buf, stored_len);
   8 +    if (stored_len != 0) zmemcpy(s->pending_buf + s->pending, (Bytef *)buf, stored_len);
   9      s->pending += stored_len;
  10  #ifdef ZLIB_DEBUG
  11      s->compressed_len = (s->compressed_len + 3 + 7) & (ulg)~7L;