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netfilter: nf_tables: add NFTA_SET_USERDATA if not null 

Kernel sends an empty NFTA_SET_USERDATA attribute with no value if
userspace adds a set with no NFTA_SET_USERDATA attribute.

Fixes: e6d8ecac9e ("netfilter: nf_tables: Add new attributes into nft_set to store user data.")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2020-08-20 14:12:54 +02:00
parent 0726763043
commit 6f03bf43ee
1 changed files with 2 additions and 1 deletions
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3
net/netfilter/nf_tables_api.c
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@ -3770,7 +3770,8 @@ 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;
nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);