Please apply "netfilter: x_tables: avoid stack-out-of-bounds read in xt_copy_counters_from_user" to 3.18.y, 4.4.y, 4.9.y

[Greg Hackmann <ghackmann@xxxxxxxxxx>]

e466af75c074 ("netfilter: x_tables: avoid stack-out-of-bounds read in
xt_copy_counters_from_user") fixes an out-of-bounds read that happens
when a userspace-controlled value is not NULL terminated.  It looks like
the fix was taken into 3.16.y but not kernels after it.