netfilter: nf_flow_table: set default timeout after successful insertion

commit 110e4872 upstream.

Set up the default timeout for this new entry otherwise the garbage
collector might quickly remove it right after the flowtable insertion.

Fixes: ac2a6666 ("netfilter: add generic flow table infrastructure")
Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

net/netfilter/nf_flow_table_core.c

@@ -203,7 +203,7 @@ int flow_offload_add(struct nf_flowtable *flow_table, struct flow_offload *flow)
 		return err;
 	}
 
-	flow->timeout = (u32)jiffies;
+	flow->timeout = (u32)jiffies + NF_FLOW_TIMEOUT;
 	return 0;
 }
 EXPORT_SYMBOL_GPL(flow_offload_add);