netfilter: nf_tables: Fix potential data-race in __nft_flowtable_type_get()

nft_unregister_flowtable_type() within nf_flow_inet_module_exit() can
concurrent with __nft_flowtable_type_get() within nf_tables_newflowtable().
And thhere is not any protection when iterate over nf_tables_flowtables
list in __nft_flowtable_type_get(). Therefore, there is pertential
data-race of nf_tables_flowtables list entry.

Use list_for_each_entry_rcu() to iterate over nf_tables_flowtables list
in __nft_flowtable_type_get(), and use rcu_read_lock() in the caller
nft_flowtable_type_get() to protect the entire type query process.

Fixes: 3b49e2e94e6e ("netfilter: nf_tables: add flow table netlink frontend")
Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 1eb51bf24fc2e52d0a26f9eebe5a30e91824107c..e02d0ae4f4364d6a4f077d5483bfc451d2826cc3 100644 (file)
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -8296,11 +8296,12 @@ static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
        return err;
 }
 
+/* call under rcu_read_lock */
 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
 {
        const struct nf_flowtable_type *type;
 
-       list_for_each_entry(type, &nf_tables_flowtables, list) {
+       list_for_each_entry_rcu(type, &nf_tables_flowtables, list) {
                if (family == type->family)
                        return type;
        }
@@ -8312,9 +8313,13 @@ nft_flowtable_type_get(struct net *net, u8 family)
 {
        const struct nf_flowtable_type *type;
 
+       rcu_read_lock();
        type = __nft_flowtable_type_get(family);
-       if (type != NULL && try_module_get(type->owner))
+       if (type != NULL && try_module_get(type->owner)) {
+               rcu_read_unlock();
                return type;
+       }
+       rcu_read_unlock();
 
        lockdep_nfnl_nft_mutex_not_held();
 #ifdef CONFIG_MODULES