[PATCH -stable,4.19 0/2] netfilter stable fixes for 4.19

Hi Greg, Sasha,

This is a backport of:

faff4e4ecd28 ("netfilter: nf_tables: bogus EBUSY when deleting flowtable after flush") 1689f25924ad ("netfilter: nf_tables: report use refcount overflow")

for -stable 4.19.

Please, apply.

Thanks.

Laura Garcia Liebana (1): netfilter: nf_tables: bogus EBUSY when deleting flowtable after flush

Pablo Neira Ayuso (1): netfilter: nf_tables: report use refcount overflow

include/net/netfilter/nf_tables.h | 35 +++++- net/netfilter/nf_tables_api.c | 180 ++++++++++++++++++++---------- net/netfilter/nft_flow_offload.c | 23 +++- net/netfilter/nft_objref.c | 8 +- 4 files changed, 177 insertions(+), 69 deletions(-)