[Bug locale/19519] iconv(1) with -c option hangs on illegal multi-byte sequences (CVE-2016-10228)

["rschiele at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19519

--- Comment #6 from Robert Schiele <rschiele at gmail dot com> ---
(In reply to Jan Engelhardt from comment #5)
> >2. Is advancing by one byte generally a good idea?
> 
> In case where each codepoint is known to be encoded as the same number of
> bytes, e.g. 4 octets in UTF-32, I would expect it to advance by that stride.
> 
> echo -en '\xff\xff\xff\xff' | iconv -f utf-32 -t utf-32//translit//ignore -c

Exactly such a case I had in mind with my concern. Thus next task is to find a
way to determine within that context the size of each code point in bytes. This
might probably be a bit difficult given that this knowledge seems to be totally
encapsulated within the iconv function call.

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