wrong check condition in patch-delta.c?

["Nguyễn Thái Ngọc Duy" <pclouds@xxxxxxxxx>]

Hi,
While inspecting patch-delta.c, I encounter this:
                      if (cp_off + cp_size < cp_size ||
                          cp_off + cp_size > src_size ||
                          cp_size > size)
                              goto bad;
"cp_off + cp_size < cp_size" doesn't make sense to me. Is it on purpose?
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