mkdir -p and network drives

[Paul Eggert]

Eric Blake <ebb9@byu.net> writes:

>> +      if (do_chdir && dirpath[0] == '/')
>> +	{
>> +	  /* POSIX says "//" might be special, so chdir to "//" if the
>> +	     file name starts with exactly two slashes.  */
>> +	  char const *root = "//" + (dirpath[1] != '/' || dirpath[2] == '/');
>
> Oops - buffer overflow bug.  dirpath[2] is past the end of the string on
> dirpath of "/",

If dirpath is "/", then dirpath[1] != '/' is true, so dirpath[2] isn't
evaluated.

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