[Bug network/13500] __cmsg_nxthdr in cmsg_nxthdr.c (CMSG_NXTHDR) has undefined behavior when setting up ancillary data

[250716887 at qq dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=13500

--- Comment #6 from phperl <250716887 at qq dot com> ---
(In reply to Florian Weimer from comment #5)
> (In reply to phperl from comment #4)
> > use NEED_A_WORKAROUND_FOR_BUG_13500 to zero buf, will make length check
> > useless, even to introduce security bugs.
> 
> Sorry, I don't understand this comment.
> 
> The length check is *always* useless for constructing ancillary data lists,
> but it is not useless for *reading* them.

Sorry, I missed the *reading* process.

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