Undefined behavior in lib/canonicalize-lgpl.c

[Florian Weimer]

We have received a report that the glibc realpath implementation
exhibits undefined behavior:

  <https://sourceware.org/bugzilla/show_bug.cgi?id=26592>

In gnulib, the code is in lib/canonicalize-lgpl.c:

    234           if (!ISSLASH (dest[-1]))
    235             *dest++ = '/';
    236 
    237           if (dest + (end - start) >= rpath_limit)
    238             {
    239               ptrdiff_t dest_offset = dest - rpath;
    240               char *new_rpath;

Thanks,
Florian
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