From: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx> commit 2b4e5fb4d3776c391e40fb33673ba946dd96012d upstream. Disable the IPv4 hooks if the IPv6 hooks fail to be registered. Fixes: ad49d86e07a4 ("netfilter: nf_tables: Add synproxy support") Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- net/netfilter/nft_synproxy.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/net/netfilter/nft_synproxy.c +++ b/net/netfilter/nft_synproxy.c @@ -191,8 +191,10 @@ static int nft_synproxy_do_init(const st if (err) goto nf_ct_failure; err = nf_synproxy_ipv6_init(snet, ctx->net); - if (err) + if (err) { + nf_synproxy_ipv4_fini(snet, ctx->net); goto nf_ct_failure; + } break; } Patches currently in stable-queue which might be from pablo@xxxxxxxxxxxxx are queue-5.4/netfilter-nft_synproxy-unregister-hooks-on-init-error-path.patch