[Bug locale/22025] New: iconv: Inconsistency between pointer mangling and NULL checks

["fweimer at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22025

            Bug ID: 22025
           Summary: iconv: Inconsistency between pointer mangling and NULL
                    checks
           Product: glibc
           Version: 2.26
            Status: NEW
          Severity: normal
          Priority: P2
         Component: locale
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
  Target Milestone: ---

We have an old downstream patch which addresses inconsistencies between pointer
mangling and NULL checks in the gconv/iconv code.  The problem is caused by
checks like this:

      /* Call the init function.  */
      if (result->__init_fct != NULL)
        {
          __gconv_init_fct init_fct = result->__init_fct;
#ifdef PTR_DEMANGLE
          PTR_DEMANGLE (init_fct);
#endif

If the pointer guard happens to have the same bit pattern as init_fct, the NULL
check will incorrectly succeed.

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