From: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx> commit 79b9b685dde1d1bf43cf84163c76953dc3781c85 upstream. Do not fetch statistics if flow has expired since it might not in hardware anymore. After this update, remove the FLOW_OFFLOAD_HW_DYING check from nf_flow_offload_stats() since this flag is never set on. Fixes: c29f74e0df7a ("netfilter: nf_flow_table: hardware offload support") Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx> Acked-by: wenxu <wenxu@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- net/netfilter/nf_flow_table_core.c | 5 ++--- net/netfilter/nf_flow_table_offload.c | 3 +-- 2 files changed, 3 insertions(+), 5 deletions(-) --- a/net/netfilter/nf_flow_table_core.c +++ b/net/netfilter/nf_flow_table_core.c @@ -348,9 +348,6 @@ static void nf_flow_offload_gc_step(stru { struct nf_flowtable *flow_table = data; - if (flow->flags & FLOW_OFFLOAD_HW) - nf_flow_offload_stats(flow_table, flow); - if (nf_flow_has_expired(flow) || nf_ct_is_dying(flow->ct) || (flow->flags & (FLOW_OFFLOAD_DYING | FLOW_OFFLOAD_TEARDOWN))) { if (flow->flags & FLOW_OFFLOAD_HW) { @@ -361,6 +358,8 @@ static void nf_flow_offload_gc_step(stru } else { flow_offload_del(flow_table, flow); } + } else if (flow->flags & FLOW_OFFLOAD_HW) { + nf_flow_offload_stats(flow_table, flow); } } --- a/net/netfilter/nf_flow_table_offload.c +++ b/net/netfilter/nf_flow_table_offload.c @@ -784,8 +784,7 @@ void nf_flow_offload_stats(struct nf_flo __s32 delta; delta = nf_flow_timeout_delta(flow->timeout); - if ((delta >= (9 * NF_FLOW_TIMEOUT) / 10) || - flow->flags & FLOW_OFFLOAD_HW_DYING) + if ((delta >= (9 * NF_FLOW_TIMEOUT) / 10)) return; offload = kzalloc(sizeof(struct flow_offload_work), GFP_ATOMIC);