Add rtattr_strlcpy to handle unterminated strings. The destination
is nulled out entirely to avoid possible leaks when dumping. The
return value can be checked for >= size to detect truncated strings.
Currently strings equal to the size of the destination are accepted
everywhere even if not null-terminated. Sometimes they are silently
truncated, sometimes the unterminated string is used.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>