From 76a2878f460e1544ffeebf9af655234ed38ea599 Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Thu, 20 Aug 2020 14:12:54 +0200 Subject: [PATCH] netfilter: nf_tables: add NFTA_SET_USERDATA if not null [ Upstream commit 6f03bf43ee05b31d3822def2a80f11b3591c55b3 ] Kernel sends an empty NFTA_SET_USERDATA attribute with no value if userspace adds a set with no NFTA_SET_USERDATA attribute. Fixes: e6d8ecac9e68 ("netfilter: nf_tables: Add new attributes into nft_set to store user data.") Signed-off-by: Pablo Neira Ayuso Signed-off-by: Sasha Levin --- net/netfilter/nf_tables_api.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index 2fa1c4f..ec460aed 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -2592,7 +2592,8 @@ static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx, goto nla_put_failure; } - if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata)) + if (set->udata && + nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata)) goto nla_put_failure; desc = nla_nest_start(skb, NFTA_SET_DESC); -- 2.7.4