netfilter: nf_tables: validate registers coming from userspace.

netfilter: nf_tables: validate registers coming from userspace.

Origin: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit?id=9e8d927cfa564e5a00cd287bd66fac6d45f0af39

commit 6e1acfa387b9ff82cfc7db8cc3b6959221a95851 upstream.

Bail out in case userspace uses unsupported registers.

Fixes: 49499c3e6e18 ("netfilter: nf_tables: switch registers to 32 bit addressing")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Gbp-Pq: Topic bugfix/all
Gbp-Pq: Name netfilter-nf_tables-validate-registers-coming-from-u.patch