netfilter: nf_tables: set dormant flag on hook register failure

[ Upstream commit bccebf64701735533c8db37773eeacc6566cc8ec ]

We need to set the dormant flag again if we fail to register
the hooks.

During memory pressure hook registration can fail and we end up
with a table marked as active but no registered hooks.

On table/base chain deletion, nf_tables will attempt to unregister
the hook again which yields a warn splat from the nftables core.

Reported-and-tested-by: syzbot+de4025c006ec68ac56fc@syzkaller.appspotmail.com
Fixes: 179d9ba5559a ("netfilter: nf_tables: fix table flag updates")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index cb7d42a3faab382ecd878c67259cf62ac5a10faf..40e8aa8343cc7e13e1afcd078840b817ed85a32d 100644 (file)
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -1253,6 +1253,7 @@ static int nf_tables_updtable(struct nft_ctx *ctx)
        return 0;
 
 err_register_hooks:
+       ctx->table->flags |= NFT_TABLE_F_DORMANT;
        nft_trans_destroy(trans);
        return ret;
 }