Hi pablo,
any other questions about this patch?
BR
wenxu
On 8/19/2019 9:22 PM, wenxu@xxxxxxxxx wrote:
> From: wenxu <wenxu@xxxxxxxxx>
>
> The flow_block_ing_cmd() needs to call blocking functions while iterating
> block_ing_cb_list, nft_indr_block_get_and_ing_cmd is in the cb_list,
> So it is the incorrect rcu case. To fix it just traverse the list under
> the commit mutex.
>
> Fixes: 9a32669fecfb ("netfilter: nf_tables_offload: support indr block call")
> Signed-off-by: wenxu <wenxu@xxxxxxxxx>
> ---
> net/netfilter/nf_tables_offload.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/net/netfilter/nf_tables_offload.c b/net/netfilter/nf_tables_offload.c
> index b95e27b..5431741 100644
> --- a/net/netfilter/nf_tables_offload.c
> +++ b/net/netfilter/nf_tables_offload.c
> @@ -363,11 +363,12 @@ void nft_indr_block_get_and_ing_cmd(struct net_device *dev,
> const struct nft_table *table;
> const struct nft_chain *chain;
>
> - list_for_each_entry_rcu(table, &net->nft.tables, list) {
> + mutex_lock(&net->nft.commit_mutex);
> + list_for_each_entry(table, &net->nft.tables, list) {
> if (table->family != NFPROTO_NETDEV)
> continue;
>
> - list_for_each_entry_rcu(chain, &table->chains, list) {
> + list_for_each_entry(chain, &table->chains, list) {
> if (nft_is_base_chain(chain)) {
> struct nft_base_chain *basechain;
>
> @@ -382,4 +383,5 @@ void nft_indr_block_get_and_ing_cmd(struct net_device *dev,
> }
> }
> }
> + mutex_unlock(&net->nft.commit_mutex);
> }
