[Bug libc/2459] Use of uninitialised variable in fnmatch when matching long strings

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

------- Additional Comments From jakub at redhat dot com  2006-03-14 15:23 -------
glibc-2_3-branch has:
#ifdef _LIBC
      n = strnlen (string, 1024);
#else
      n = strlen (string);
#endif
      p = string;
      if (__builtin_expect (n < 1024, 1))
        {
          wstring = (wchar_t *) alloca ((n + 1) * sizeof (wchar_t));
          n = mbsrtowcs (wstring, &p, n + 1, &ps);
          if (__builtin_expect (n == (size_t) -1, 0))
            /* Something wrong.
               XXX Do we have to set `errno' to something which mbsrtows hasn't
               already done?  */
            return -1;
          if (p)
            memset (&ps, '\0', sizeof (ps));
        }
      if (__builtin_expect (p != NULL, 0))
        {
          n = mbsrtowcs (NULL, &string, 0, &ps);
          if (__builtin_expect (n == (size_t) -1, 0))
            /* Something wrong.
               XXX Do we have to set `errno' to something which mbsrtows hasn't
               already done?  */
            return -1;
          wstring = (wchar_t *) alloca ((n + 1) * sizeof (wchar_t));
          assert (mbsinit (&ps));
          (void) mbsrtowcs (wstring, &string, n + 1, &ps);
        }

      return internal_fnwmatch (wpattern, wstring, wstring + n,
                                flags & FNM_PERIOD, flags);

No try_singlebyte label and I don't see how can wstring end up being
uninitialized (well, GCC will warn, but that's GCC deficiency).

-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=2459

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