From: Pablo Neira Ayuso pablo@netfilter.org
commit 7e6bc1f6cabcd30aba0b11219d8e01b952eacbb6 upstream.
Make sure element data type and length do not mismatch the one specified by the set declaration.
Fixes: 7d7402642eaf ("netfilter: nf_tables: variable sized set element keys / data") Reported-by: Hugues ANGUELKOV hanguelkov@randorisec.fr Signed-off-by: Pablo Neira Ayuso pablo@netfilter.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/netfilter/nf_tables_api.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
--- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -5213,13 +5213,20 @@ static int nft_setelem_parse_data(struct struct nft_data *data, struct nlattr *attr) { + u32 dtype; int err;
err = nft_data_init(ctx, data, NFT_DATA_VALUE_MAXLEN, desc, attr); if (err < 0) return err;
- if (desc->type != NFT_DATA_VERDICT && desc->len != set->dlen) { + if (set->dtype == NFT_DATA_VERDICT) + dtype = NFT_DATA_VERDICT; + else + dtype = NFT_DATA_VALUE; + + if (dtype != desc->type || + set->dlen != desc->len) { nft_data_release(data, desc->type); return -EINVAL; }