[Bug locale/26224] New: iconv hangs when converting some invalid inputs from several IBM character sets

["arjun.is at lostca dot se" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=26224

            Bug ID: 26224
           Summary: iconv hangs when converting some invalid inputs from
                    several IBM character sets
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: locale
          Assignee: unassigned at sourceware dot org
          Reporter: arjun.is at lostca dot se
  Target Milestone: ---

I found the following hangs when running an iconv input fuzzer I wrote while
trying to fix bug 19519. The hangs are present in master:

echo -en '\x00\x0f' | iconv -t UTF-8 -c -f IBM1364
echo -en '\x00\x0f' | iconv -t UTF-8 -c -f IBM1371
echo -en '\x00\x0f' | iconv -t UTF-8 -c -f IBM1388
echo -en '\x00\x0f' | iconv -t UTF-8 -c -f IBM1390
echo -en '\x00\x0f' | iconv -t UTF-8 -c -f IBM1399

These hangs are presently mentioned but commented out in
iconv/tst-iconv_prog.sh and should eventually be un-commented when this bug is
fixed.

The fuzzer itself (attachment 11786) should also be run against these character
sets after this bug is fixed, because they skip all remaining inputs for a
character set once they encounter a hang in the corresponding converter, and
thus any other hangs (from possibly other bugs) aren't tested for.

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