datatype: fix missing nul-terminated string in string_type_print

Thomas Berger reported that he is seeing garbage after valid string
values, eg.

fwtest01 ~ # nft -i
nft> table filter
nft> add chain filter input
nft> add rule filter input meta iifname "lo" accept
nft> list table filter
table ip filter {
        chain input {
                 meta iifname "lo�.�" accept
        }
...

The buffer that is allocated in the stack does not include room to
nul-terminate the string accordingly. This patch fixes bugzilla
report #872:

https://bugzilla.netfilter.org/show_bug.cgi?id=872

Reported-by: Thomas Berger <loki@lokis-chaos.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

0 files changed, 0 insertions, 0 deletions