netfilter: nft_chain_filter: handle NETDEV_UNREGISTER for inet/ingress basechain

commit 01acb2e8666a6529697141a6017edbf206921913 upstream.

Remove netdevice from inet/ingress basechain in case NETDEV_UNREGISTER
event is reported, otherwise a stale reference to netdevice remains in
the hook list.

Fixes: 60a3815da702 ("netfilter: add inet ingress support")
Cc: stable@vger.kernel.org
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/netfilter/nft_chain_filter.c b/net/netfilter/nft_chain_filter.c
index 680fe55..274b6f7 100644 (file)
--- a/net/netfilter/nft_chain_filter.c
+++ b/net/netfilter/nft_chain_filter.c
@@ -357,9 +357,10 @@ static int nf_tables_netdev_event(struct notifier_block *this,
                                  unsigned long event, void *ptr)
 {
        struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+       struct nft_base_chain *basechain;
        struct nftables_pernet *nft_net;
-       struct nft_table *table;
        struct nft_chain *chain, *nr;
+       struct nft_table *table;
        struct nft_ctx ctx = {
                .net    = dev_net(dev),
        };
@@ -371,7 +372,8 @@ static int nf_tables_netdev_event(struct notifier_block *this,
        nft_net = nft_pernet(ctx.net);
        mutex_lock(&nft_net->commit_mutex);
        list_for_each_entry(table, &nft_net->tables, list) {
-               if (table->family != NFPROTO_NETDEV)
+               if (table->family != NFPROTO_NETDEV &&
+                   table->family != NFPROTO_INET)
                        continue;
 
                ctx.family = table->family;
@@ -380,6 +382,11 @@ static int nf_tables_netdev_event(struct notifier_block *this,
                        if (!nft_is_base_chain(chain))
                                continue;
 
+                       basechain = nft_base_chain(chain);
+                       if (table->family == NFPROTO_INET &&
+                           basechain->ops.hooknum != NF_INET_INGRESS)
+                               continue;
+
                        ctx.chain = chain;
                        nft_netdev_event(event, dev, &ctx);
                }